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Clinical Microbiology
Minireview
19 December 2022

Update on Novel Taxa and Revised Taxonomic Status of Bacteria Isolated from Nondomestic Animals Described in 2018 to 2021

ABSTRACT

Revisions and new additions to bacterial taxonomy can have a significant widespread impact on clinical practice, infectious disease epidemiology, veterinary microbiology laboratory operations, and wildlife conservation efforts. The expansion of genome sequencing technologies has revolutionized our knowledge of the microbiota of humans, animals, and insects. Here, we address novel taxonomy and nomenclature revisions of veterinary significance that impact bacteria isolated from nondomestic wildlife, with emphasis being placed on bacteria that are associated with disease in their hosts or were isolated from host animal species that are culturally significant, are a target of conservation efforts, or serve as reservoirs for human pathogens.

INTRODUCTION

Understanding diseases of wildlife is important for a variety of reasons. Many human populations depend on wildlife for food and livelihoods, while maintaining wildlife diversity and protecting animal health are crucial for maintaining ecosystem health (15). Microbes are fundamental to animal and ecosystem health both positively and to its detriment (6). Additionally, microbes can move among wildlife, domestic animals, and humans and, as the SARS-CoV-2 pandemic clearly demonstrated, ultimately have the potential to significantly impact human health (79). Moreover, historic accounts have clearly demonstrated this paradigm with respect to Yersinia pestis (10).
In order to satisfy an unmet need in clinical veterinary microbiology practice, this taxonomy minireview focuses on bacteria isolated from nondomestic wildlife, with emphasis being placed largely on bacteria that cause disease in animal hosts or are found in animals that could serve as reservoirs for human disease. Novel bacterial taxa and nomenclature revisions relative to veterinary medicine were searched from 2018 through 2021. Of the >350 novel taxa observed, around 40% were related to prokaryotes derived from nondomestic wildlife animals. These data, along with notations of revised taxonomy relative to prokaryotes derived from these wildlife hosts, are presented in the current report. Other taxonomic changes relative to organisms derived from domestic animals (11) and aquatic hosts (12) are presented in other reports in this issue of the Journal of Clinical Microbiology.

MATERIALS AND METHODS

Valid and effectively published novel and revised taxa pertinent to prokaryotic species must satisfy two requirements set forth by the International Committee on Systematics of Prokaryotes within the International Code of Nomenclature of Prokaryotes (13). First, original investigations are published in the International Journal of Systematic and Evolutionary Microbiology (IJSEM). One example is provided by Niu et al. (14). In addition, type strains are to be deposited into recognized culture collections in two separate nations.
As an alternative to primary publication in the IJSEM, studies may be published in another journal, with later acceptance by the IJSEM. One previous example relative to nondomestic animal-derived bacteria is the effective description of Microbacterium gilvum (15), with subsequent acceptance on an IJSEM validation list (16). Six times per year, the IJSEM publishes papers that are now entitled Valid Publication of New Names and New Combinations Effectively Published Outside the IJSEM. To be considered for inclusion in a validation list, authors must submit a copy of the previously published manuscript to the editorial office of the IJSEM for confirmation that all elements necessary for valid publication (including culture collection deposition) have been met. It must be noted that taxa within a primary publication or in validation lists may be subject to reclassification on the basis of a synonym designation or transfer to another genus. We attempt to capture additional revisions in this report.
In such a fashion, journals that have recently published studies providing an effective description of nondomestic wildlife animal-derived novel taxa that may be relevant for the practice of clinical veterinary microbiology include Applied and Environmental Microbiology, Archives of Microbiology, Avian Diseases, Diseases of Aquatic Organisms, Frontiers in Microbiology, MicrobiologyOpen, PLoS Neglected Tropical Diseases, Research in Microbiology, Standards in Genomic Sciences, and Systematic and Applied Microbiology. Journals that have recently published studies reflecting revisions in prokaryotic taxonomy relative to nondomestic animal hosts include Antonie Van Leeuwenhoek and Frontiers in Microbiology.
All issues of the IJSEM published from January 2018 through December 2021 (including 24 validation lists) were manually searched for original articles describing new species taxonomy or accepted changes in taxonomic nomenclature. This audit was further filtered by organisms recovered from nondomestic wildlife animals. Not included within the definition of nondomestic wildlife animals are companion animals, animals found in agricultural settings, and farmed avian species.

RESULTS AND DISCUSSION

A compilation of novel taxa recovered from nondomestic wildlife animal sources stratified by Gram reaction, cellular morphology, and oxygen growth requirements is presented in Table 1. Correct and updated Enterobacterales family designations (17) for selected taxa are concomitantly provided. It should be noted that in Table 1, a subset of biochemical testing results was derived using methods that are potentially time-consuming, antiquated, and/or not routinely available in veterinary microbiology laboratories; furthermore, a definitive identification of other novel taxa may necessitate matrix-assisted laser desorption ionization–time of flight mass spectrometry, molecular, or sequencing modalities. Table 2 provides taxonomic revisions for organisms originally recovered from nondomestic wildlife animal sources.
TABLE 1
TABLE 1 Novel bacterial species recovered from nondomestic wildlife veterinary material reported from January 2018 through December 2021
Scientific nameFamilySource(s)Growth characteristicsqReference(s)
 Gram-positive cocci    
Lactococcus petauri sp. nov.StreptococcaceaeSugar glider abscessFacultative, catalase-negative, oxidase-negative, Gram-positive coccus; orange-pigmented, beta-hemolytic colonies on tryptic soy agar with 5% sheep blood; optimal growth at 20°C–40°C; d-ribose, amygdalin, sucrose, d-tagatose, and leucine arylamidase positive; d-xylose, lactose, melibiose, raffinose, and β-glucuronidase negative18
Kocuria uropygioeca sp. nov.MicrococcaceaePreen gland of great spotted woodpecker (Dendrocopos major) from GermanyAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 1- to 2-mm-diam nonviscous, convex, circular, pale-orange-pigmented, gamma-hemolytic colonies on Columbia agar supplemented with sheep blood; optimal growth at 35°C; α-glucosidase, gelatin hydrolysis, and maltose positive; acid phosphatase, esculin hydrolysis, and nitrate reduction negative69a
Kocuria uropygialis sp. nov.MicrococcaceaePreen gland of great spotted woodpecker (Dendrocopos major) from GermanyAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 1- to 2-mm-diam nonviscous, convex, circular, pale-orange-pigmented, gamma-hemolytic colonies on Columbia agar supplemented with sheep blood; optimal growth at 35°C; acid phosphatase, gelatin hydrolysis, and maltose positive; α-glucosidase, esculin hydrolysis, and nitrate reduction negative69a
Streptococcus respiraculi sp. nov.StreptococcaceaeRespiratory tract of Himalayan marmot (Marmota himalayana) from Tibet-Qinghai Plateau, ChinaFacultative, nonmotile, catalase-negative, non-spore-forming, Gram-positive coccus; 0.5- to 1-mm-diam nontranslucent, nonpigmented, alpha-hemolytic colonies on Columbia blood agar; growth range at 22°C–42°C; does not react with Lancefield A, B, C, D, F, or G antisera; growth in up to 2.5% NaCl; inulin and d-sorbitol positive; β-glucosidase and gentiobiose negative25
Brachybacterium avium sp. nov.DermabacteraceaeFecal sample from Andean condor (Vultur gryphus) from South KoreaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 0.5- to 1-mm-diam ivory-colored, low-convex, circular colonies on tryptic soy agar; optimal growth at 30°C; glucose, arabinose, maltose, l-arabinose, d-adonitol, d-trehalose, and d-arabitol positive; dulcitol, β-glucuronidase, and urease negative; possesses β-lactamase; possesses a genetic determinant encoding a vancomycin B-type resistance protein70b
Brachybacterium vulturis sp. nov.DermabacteraceaeFecal sample from an Andean condor (Vultur gryphus) from South KoreaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 0.5- to 1-mm-diam ivory-colored, low-convex, circular colonies on tryptic soy agar; optimal growth at 30°C; dulcitol, β-glucuronidase, and urease positive; glucose, arabinose, maltose, l-arabinose, d-adonitol, d-trehalose and d-arabitol negative; possesses β-lactamase70b
Kocuria tytonis sp. nov.MicrococcaceaePreen gland of American barn owl (Tyto furcata) from GermanyFacultative, nonmotile, catalase-positive, non-spore-forming, Gram-positive coccus; 1- to 2-mm-diam orange, convex, opaque colonies on Columbia agar supplemented with 5% sheep blood; optimal growth at 30°C; esterase, esterase lipase, and gelatin hydrolysis positive; assimilates mannitol and malate; β-galactosidase, α-glucosidase, and urease negative; decreased MIC values for amoxicillin, doxycycline, erythromycin, and vancomycin; elevated MIC for polymyxin B71
Streptococcus chenjunshii sp. nov.StreptococcaceaeTibetan antelope (Pantholops hodgsonii) feces from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive coccus; 0.5- to 1.3-mm-diam gray, opaque, rough-surfaced, alpha-hemolytic colonies on brain heart infusion agar; growth range at 25°C–39°C in brain heart infusion broth; inulin, raffinose, potassium, and 5-keto-glutarate positive; glycerol, d-tagatose, acid phosphatase, urea, and β-glucosidase negative72
Vagococcus xieshaowenii sp. nov.EnterococcaceaeCloacal content of snow finch (Montifringilla taczanowskii) from Tibet-Qinghai Plateau, ChinaAerobic, nonmotile, catalase-negative, oxidase-negative, Gram-positive coccus; 0.1- to 0.2-mm-diam pale white, smooth, circular, alpha-hemolytic colonies on brain heart infusion agar with 5% defibrinated sheep blood; optimal growth at 37°C; C4 esterase, pyroglutamic acid arylamidase, d-mannitol, and d-ribose positive; leucine arylamidase, N-acetyl-β-glucosaminidase, lactose, trehalose, and sucrose negative; reported susceptibility to β-lactam agents, ciprofloxacin, tetracycline, and vancomycin; reported resistance to macrolides, clindamycin, and metronidazole73
Jeotgalibaca ciconiae sp. nov.CarnobacteriaceaeFeces of Oriental stork (Ciconia boyciana) from South KoreaFacultative, motile, catalase-negative, oxidase-negative, Gram-positive coccus; opaque, pale yellow, circular colonies on tryptic soy agar; optimal growth at 30°C; gentiobiose, N-acetyl-d-galactosamine, d-glucose-6-phosphate, d-fructose-6-phosphate, stachyose, raffinose, and β-glucuronidase positive; ribose, α-galactosidase, glycerol, gluconate, and arabinose negative74
Arthrobacter yangruifuii sp. nov.MicrococcaceaePlateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 0.9- to 1.2-mm-diam yellow, round, convex colonies on brain heart infusion agar supplemented with 5% defibrinated sheep blood; growth range at 4°C–37°C; d-xylose and β-glucosidase positive; cellobiose and β-galactosidase negative75
Arthrobacter zhaoguopingii sp. nov.MicrococcaceaeRuddy shelduck (Tadorna ferruginea) feces from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive coccus; 0.8- to 1-mm-diam rose/pink, circular, convex colonies on brain heart infusion agar with 5% defibrinated sheep blood; growth range at 4°C–30°C; cystine arylamidase positive; d-xylose and β-glucosidase negative75
Streptococcus catagoni sp. nov.StreptococcaceaeLung of Chacoan peccary (Catagonus wagneri) with purulent pneumoniaFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive coccus; 0.4- to 0.8-mm-diam beta-hemolytic colonies on blood agar cultivated at 37°C; glycogen and Voges-Proskauer test positive; β-glucosidase, α-galactosidase, pyrrolidonyl arylamidase, d-mannitol, and raffinose negative26
Staphylococcus durrellii sp. nov.StaphylococcaceaeOropharynx of captive Livingstone’s fruit bat (Pteropus livingstonii) from the United KingdomCatalase-positive, oxidase-negative, clumping factor-negative, coagulase-negative, nonhemolytic, Gram-positive coccus; 1- to 2-mm-diam smooth, shiny, domed, yellow colonies on Columbia agar with 5% sheep blood; isolate cultivated in a 37°C aerobic environment; β-glucuronidase, alkaline phosphatase, trehalose, and d-mannitol positive; acetoin, maltose, DNase, urease, and ornithine decarboxylase negative; resistant to novobiocin and susceptible to polymyxin B35
Staphylococcus lloydii sp. nov.StaphylococcaceaeSkin of captive Livingstone’s fruit bat (Pteropus livingstonii) from the United KingdomCatalase-positive, oxidase-negative, clumping factor-negative, coagulase-negative, nonhemolytic, Gram-positive coccus; 1- to 2-mm-diam smooth, shiny, domed, white or yellow/cream colonies on Columbia agar with 5% sheep blood; isolate cultivated in a 37°C aerobic environment; acetoin and maltose positive; β-glucuronidase, DNase, urease, and ornithine decarboxylase negative; resistant to novobiocin and susceptible to polymyxin B35
Streptococcus pacificus sp. nov.StreptococcaceaeLung tissue of California sea lion (Zalophus californianus) from the United States with acute domoic acid toxicityFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive coccus; ≤1-mm-diam gray, translucent, incomplete alpha-hemolytic colonies on blood agar; growth at 37°C; does not react with Lancefield A, B, C, D, F, or G antisera; Voges-Proskauer test and esculin hydrolysis positive; hippurate, H2S, and nitrite reduction negative27
Streptococcus zalophi sp. nov.StreptococcaceaeLung tissue of California sea lion (Zalophus californianus) from the United States with chronic domoic acid toxicityFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive coccus; ≤1-mm-diam gray, translucent, incomplete alpha-hemolytic colonies on blood agar; growth at 37°C; does not react with Lancefield A, B, C, D, F, or G antisera; hippurate and Voges-Proskauer test positive; H2S and nitrate reduction negative27
Gram-positive bacilli    
Virgibacillus phasianinus sp. nov.BacillaceaeFeces of Swinhoe’s pheasant (Lophura swinhoii) from South KoreaAerobic, motile, catalase-positive, Gram-positive bacillus; 0.5- to 1-mm-diam beige, convex, circular colonies on marine agar; optimal growth at 30°C; acid phosphatase positive; produces acid from glycerol, d-galactose, d-glucose, d-mannose, d-mannitol, maltose, sucrose, l-fucose, and d-arabitol; assimilates d-mannose, d-mannitol, N-acetylglucosamine, maltose, and potassium gluconate; urease, β-glucuronidase, and d-xylose negative76
Tumebacillus avium sp. nov.AlicyclobacillaceaeGut of cinereous vulture (Aegypius monachus) from South KoreaFacultative, motile, catalase-negative, oxidase-negative, spore-forming, Gram-positive bacillus; circular, smooth, white colonies on Reasoner’s 2A agar; optimal growth at 25°C–30°C; ribose and N-acetylglucosamine positive; nitrate reduction, DNase, and N-acetyl-β-glucosaminidase negative77
Actinomyces tangfeifanii sp. nov.ActinomycetaceaeRectal swab from wild vulture (Aegypius monachus) from Tibet-Qinghai Plateau, China; taxon has been subject to subsequent revision to the novel genus Boudabousia (Table 2)Facultative, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 0.6- to 1-mm-diam gray/white, opaque, shiny colonies on sheep blood agar; cultivated at 37°C; produces acid from d-xylose and d-galactose; positive for nitrate reduction, gelatin hydrolysis, and α-fucosidase; negative for melibiose, sucrose, trehalose, melezitose, raffinose, d-mannose, l-sorbose, starch, and α-glucosidase78
Nocardioides houyundeii sp. nov.NocardioidaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, catalase-positive, oxidase-negative, nonmotile, Gram-positive bacillus; cream-colored, convex, circular colonies on brain heart infusion agar with 5% sheep agar; optimal growth at 28°C; positive reactions for α-glucosidase and d-tagatose; negative reactions for trypsin, d-arabitol, and d-mannitol79
Cohnella faecalis sp. nov.PaenibacillaceaeAnimal feces collected from a karst cave in ChinaAerobic, motile, catalase-positive, oxidase-positive, spore-forming, Gram-positive bacillus; white, convex, smooth colonies on Reasoner’s 2A agar; optimal growth at 30°C; positive reaction for potassium gluconate; negative reactions for d-mannose, d-mannitol, N-acetyl-gluconate, and α-galactosidase80
Salinibacterium hongtaonis sp. nov.MicrobacteriaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, non-spore-forming, Gram-positive bacillus; pale yellow, opaque, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 28°C; positive reactions for l-arabinose, α-galactosidase, and β-glucosidase; negative reactions for d-mannose, starch, naphthol-AS-BI-phosphohydrolase, and β-galactosidase81
Mycetocola zhujimingii sp. nov.MicrobacteriaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, catalase-positive, non-spore-forming, Gram-positive bacillus; yellow, opaque, shiny, thick colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-tagatose, cystine arylamidase, and α-mannosidase; negative reactions for d-glucose, maltose, d-gentiobiose, and α-glucosidase82
Paraliobacillus zengyii sp. nov.BacillaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaFacultative, motile, catalase-positive, oxidase-negative, spore-forming, Gram-positive bacillus; 1-mm-diam creamy white to pale yellow, convex, round colonies on brain heart infusion agar with 3% NaCl; optimal growth at 28°C; positive reactions for melibiose, d-mannitol, and d-xylose; negative reactions for leucine arylamidase, α-glucosidase, raffinose, sucrose, turanose, and melezitose83
Filibacter tadaridae sp. nov.CaryophanaceaeIsolated from guano of Mexican free-tailed bats (Tadarida brasiliensis) from the United StatesAerobic, nonmotile, oxidase-positive, non-spore-forming, Gram-positive bacillus; 2- to 3-mm-diam beige, convex, circular colonies on tryptic soy agar; optimal growth at 25°C–28°C; negative reactions for urease, d-glucose, and β-galactosidase84
Fudania jinshanensis gen. nov., sp. nov.ActinomycetaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaFacultative, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; <1-mm-diam white, opaque, convex, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 37°C; positive reactions for d-galactose, starch, and glycogen; negative reaction for trehalose85
Actinomyces lilanjuaniae sp. nov.ActinomycetaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; white, dry, opaque, circular colonies on brain heart infusion agar; optimal growth at 37°C; positive reactions for d-adonitol and d-xylose; negative reactions for d-mannose, d-melibiose, and esterase86
Nocardioides yefusunii sp. nov.NocardioidaceaeFeces of Tibetan wild ass (Equus kiang) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam yellow, convex, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 28°C; positive reactions for β-glucosidase, d-fructose, and d-ribose; negative reactions for cellobiose, trehalose, and α-glucosidase87
Actinomyces qiguomingii sp. nov.ActinomycetaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1-mm-diam white, convex, circular colonies on brain heart infusion-sheep blood agar; optimal growth at 37°C; positive reactions for d-mannitol, inulin, and alkaline phosphatase; negative reactions for d-arabitol and C4 esterase88
Microbacterium wangchenii sp. nov.MicrobacteriaceaeFecal sample from Tibetan gazelle (Procapra picticaudata) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; yellowish, convex, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 30°C; positive reactions for nitrate reduction, α-mannosidase, d-arabinose, and d-lyxose; negative reaction for β-galactosidase89
Psychrobacillus vulpis sp. nov.CaryophanaceaeFeces of red fox (Vulpes vulpes) from SpainFacultative, motile, catalase-positive, oxidase-positive, spore-forming, Gram-positive bacillus; gray, transparent, vortex colonies on tryptic soy agar; optimal growth at 28°C; positive reactions for l-tyrosine, N-acetylglucosamine, and adipic acid; negative reactions for gelatin hydrolysis, urea hydrolysis, and starch90
Weissella muntiaci sp. nov.LeuconostocaceaeFeces of Formosan barking deer (Muntiacus reevesi) from TaiwanFacultative, nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, flat, circular colonies on MRS agar; optimal growth at 30°C; positive reactions for l-arabinose and acetoin production; negative reactions for d-fructose, d-mannose, maltose, and esculin hydrolysis91
Cellulomonas shaoxiangyii sp. nov.CellulomonadaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 0.5- to 1.1-mm-diam yellow, moist, circular colonies on Reasoner’s 2A agar; optimal growth at 28°C; positive reactions for l-rhamnose, urea, and Voges-Proskauer tests; negative reactions for raffinose, d-mannitol, and gelatinase92
Mumia zhuanghuii sp. nov.NocardioidaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 0.2- to 0.5-mm-diam white, opaque, dry colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-arabinose, methyl-α-d-glucopyranoside, arbutin, and d-lyxose; negative reactions for d-ribose, d-galactose, d-fucose, and l-fucose93
Agromyces badenianii sp. nov.MicrobacteriaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, Gram-positive bacillus; yellow, convex, circular colonies on tryptic soy agar; optimal growth at 28°C; negative reactions for d-fructose, arbutin, salicin, starch, and leucine arylamidase94
Georgenia wutianyii sp. nov.BogoriellaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 0.8- to 1.1-mm-diam yellow, opaque, circular colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for l-xylose, acid phosphatase, and arbutin; negative reactions for d-ribose, alkaline phosphatase, and α-glucosidase95
Georgenia yuyongxinii sp. nov.BogoriellaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 0.6- to 1-mm-diam yellow, opaque, circular colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-ribose, alkaline phosphatase, and α-glucosidase; negative reactions for arbutin, d-galactose, gentiobiose, and acid phosphatase95
Corynebacterium silvaticum sp. nov.CorynebacteriaceaeGross lesions caused by lamellar lymph node abscesses of wild boar and roe deer from GermanyAerobic, microaerophilic, motile, catalase-variable, non-spore-forming, Gram-positive bacillus; white, waxy, small colonies on sheep blood agar; optimal growth at 37°C; positive reactions for urea, glucose, ribose, and maltose; negative reactions for glycogen, esculin, gelatin, mannitol, and sucrose36
Nocardioides jishulii sp. nov.NocardioidaceaeFeces of Tibetan gazelle (Procapra picticaudata) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; yellowish, convex, opaque colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 28°C; positive reactions for acid phosphatase, cellobiose, and d-fructose; negative reactions for d-ribose, melibiose, and mannitol96
Actinomyces wuliandei sp. nov.ActinomycetaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaNonmotile Gram-positive bacillus; white, smooth, moist colonies on brain heart infusion-sheep blood agar; optimal growth at 37°C; positive reactions for d-xylose, melezitose, glycogen, starch, and C4 esterase; negative reactions for valine arylamidase, α-galactosidase, and β-galactosidase97
Corynebacterium liangguodongii sp. nov.CorynebacteriaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, non-spore-forming, Gram-positive bacillus; 0.8- to 1.5-mm-diam white, opaque, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 37°C; positive reactions for d-fructose, 5-potassium ketogluconate, and α-chymotrypsin; negative reactions for lactose, d-tagatose, and nitrate reduction97
Corynebacterium yudongzhengii sp. nov.CorynebacteriaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, non-spore-forming, Gram-positive bacillus; 0.1- to 0.5-mm-diam yellow, dry, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 37°C; positive reactions for esculin, ribose, 5-potassium ketogluconate, and α-chymotrypsin; negative reactions for lactose and nitrate reduction97
Oceanobacillus zhaokaii sp. nov.BacillaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, motile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 1.8-mm-diam white, convex, circular colonies on marine agar; optimal growth at 35°C; positive reactions for amygdalin, glycerol, l-arabinose, and alkaline phosphatase; negative reactions for d-xylose, melibiose, raffinose, and acid phosphatase97
Aeromicrobium chenweiae sp. nov.NocardioidaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; white, convex, circular colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for N-acetylglucosamine, mannitol, α-fucosidase, and α-mannosidase; negative reactions for glycerol, maltose, and β-glucosidase98
Aeromicrobium yanjiei sp. nov.NocardioidaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; white, convex, circular colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-glucose, maltose, and β-glucosidase; negative reactions for inositol, l-arabinose, acid phosphatase, and cysteine arylamidase98
Gulosibacter macacae sp. nov.MicrobacteriaceaeFeces of Macaca mulatta from ChinaAerobic, nonmotile, catalase-positive, oxidase-positive, non-spore-forming, Gram-positive bacillus; 0.5- to 0.8-mm-diam white, convex, circular colonies on tryptic soy agar; optimal growth at 30°C–37°C; positive reactions for d-fructose, d-mannitol, trypsin, and β-glucuronidase; negative reactions for inositol, trehalose, salicin, and C4 esterase99
Flaviflexus ciconiae sp. nov.ActinomycetaceaeFeces of Oriental stork (Ciconia boyciana) from South KoreaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; beige, raised, circular colonies on tryptic soy agar; optimal growth at 30°C–37°C; l-xylose, inositol, methyl-β-d-glucoside, N-acetyl-neuraminic acid, inosine, d-arabitol, myo-inositol, d-gluconic acid, Tween 40, l-xylose, inositol, and β-galactosidase positive; l-malic acid, leucine arylamidase, d-xylose, and raffinose negative100
Corynebacterium anserum sp. nov.CorynebacteriaceaeFeces of white-fronted goose (Anser albifrons) from ChinaFacultative, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam creamy/white, convex, circular colonies on tryptic soy agar; optimal growth at 35°C–37°C; acid phosphatase, galactose, and glucose positive; urease, cellobiose, trehalose, and ribose negative; reported susceptibility to penicillin, erythromycin, vancomycin, ciprofloxacin, tetracycline, and gentamicin101
Microbacterium caowuchunii sp. nov.MicrobacteriaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 1.2- to 2.6-mm-diam ivory, opaque, circular colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-arabitol, erythritol, and C8 esterase lipase; negative reactions for salicin, amygdalin, and melezitose102
Microbacterium lushaniae sp. nov.MicrobacteriaceaeIntestinal contents of plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; 0.3- to 0.6-mm-diam white, opaque, dry colonies on brain heart infusion agar; optimal growth at 28°C; positive reactions for d-arabitol, erythritol, and C8 esterase lipase; negative reactions for salicin, amygdalin, and melezitose102
Actinomyces marmotae sp. nov.ActinomycetaceaeRespiratory tract of Himalayan marmot (Marmota himalayana) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; white, opaque, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 35°C; positive reactions for d-ribose, d-xylose, and arginine arylamidase; negative reactions for lactose, d-mannitol, inulin, and β-glucuronidase30
Actinomyces procaprae sp. nov.ActinomycetaceaeFeces of Tibetan gazelle (Procapra picticaudata) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; white, opaque, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 37°C; positive reactions for lactose, melezitose, and α-galactosidase; negative reactions for d-ribose, arginine arylamidase, and β-glucosidase30
Corynebacterium lizhenjunii sp. nov.CorynebacteriaceaeRespiratory tract of Himalayan marmot (Marmota himalayana) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam pale yellow, convex, opaque colonies on brain heart infusion agar; optimal growth at 37°C; positive reactions for esculin, d-fructose, and sucrose; negative reactions for alkaline phosphatase, d-galactose, and maltose31
Corynebacterium qintianiae sp. nov.CorynebacteriaceaeLung tissue of blue sheep (Pseudois nayaur) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam bright yellow, convex, circular colonies on brain heart infusion agar; optimal growth at 37°C; positive reactions for alkaline phosphatase, d-mannose, d-glucose, and d-fructose; negative reactions for esculin and d-mannitol31
Microbacterium chengjingii sp. nov.MicrobacteriaceaeFeces of bats (Hipposideros spp.) from ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, Gram-positive bacillus; white, round, moist, convex colonies on brain heart infusion agar; optimal growth at 28°C; α-mannosidase, β-glucosidase, d-adonitol, and d-ribose positive; α-galactosidase and methyl-β-d-xylopyranoside negative103
Microbacterium fandaimingii sp. nov.MicrobacteriaceaeFeces of bats (Rousettus spp.) from ChinaAerobic, motile, catalase-positive, oxidase-negative, Gram-positive bacillus; white, round, moist, convex colonies on brain heart infusion agar; optimal growth at 28°C; α-galactosidase and methyl-β-d-xylopyranoside positive; α-mannosidase, β-glucosidase, d-adonitol, and d-ribose negative103
Gordonia jinghuaiqii sp. nov.GordoniaceaeRectum of Himalayan marmot (Marmot himalayana) from Qinghai-Tibet Plateau, ChinaFacultative, catalase-positive, oxidase-negative, Gram-positive bacillus; beige, convex, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 35°C; positive reactions for ribose, glucose, esculin, and urease; negative reactions for galactose, maltose, citrate, and alkaline phosphatase104
Gordonia zhaorongruii sp. nov.GordoniaceaeFeces of wild ass (Equus kiang) from Qinghai-Tibet Plateau, ChinaAerobic, catalase-positive, oxidase-negative, Gram-positive bacillus; 1- to 2-mm-diam creamy, convex, round colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 28°C; positive reactions for glucose, fructose, maltose, and alkaline phosphatase; negative reactions for urease, galactose, and maltose104
Nocardioides dongkuii sp. nov.NocardioidaceaeFeces of Tibetan antelope (Pantholops hodgsonii) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; cream-colored, convex, circular colonies on brain heart infusion agar with 5% sheep blood; optimal growth at 28°C; positive reactions for d-galactose, d-xylose, and l-arabinose; negative reactions for alkaline phosphatase and C14 lipase105
Ruania zhangjianzhongii sp. nov.RuaniaceaeFeces of bats (Hipposideros spp.) from ChinaAerobic, nonmotile, catalase-positive, oxidase-positive, Gram-positive bacillus; circular, opaque, oyster white, convex colonies on sheep blood agar; optimal growth at 25°C; α-galactosidase, β-glucuronidase, leucine arylamidase, melibiose, and trehalose positive; nitrate reduction, citrate, acid phosphatase, β-glucosidase, and methyl-β-d-xylopyranoside negative106
Corynebacterium zhongnanshanii sp. nov.CorynebacteriaceaeTrachea of Himalayan marmot (Marmot himalayana) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam gray, convex, circular colonies on brain heart infusion agar with 5% defibrinated sheep blood; optimal growth at 35°C–37°C; positive reactions for C8 esterase lipase, urease, d-glucose, and ribose; negative reactions for leucine arylamidase, cellobiose, galactose, and lactose32
Corynebacterium heidelbergense sp. nov.CorynebacteriaceaePreen glands of Egyptian goose (Alopochen aegyptiacus) from GermanyFacultative, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 0.5-mm-diam circular, nonpigmented, nonviscous, convex colonies on Columbia blood agar when cultivated at 37°C; positive for pyrazinamidase, urease, lipophilism, and acid from glucose; negative for pyrrolidonyl arylamidase and acid from ribose; MIC of ≤1 μg/mL reported for ampicillin, amikacin, ciprofloxacin, doxycycline, erythromycin, and vancomycin; polymyxin B MIC of >64 μg/mL107c
 Gram-negative diplococci    
Neisseria zalophi sp. nov.NeisseriaceaeOral cavity of California sea lion (Zalophus californianus)Aerobic, nonmotile, catalase-positive, oxidase-positive, non-spore-forming, Gram-negative diplococcus and coccobacillus; 1- to 2-mm-diam circular, opaque, convex, gray-pigmented, nonhemolytic colonies cultivated on Columbia agar incubated at 36°C with 5% CO2; no growth on MacConkey agar or modified Thayer-Martin agar; positive for nitrate reductase, proline arylamidase, C8 esterase lipase, cystine acrylamidase, and acid phosphatase; negative for d-glucose and alkaline phosphatase108d
Neisseria weixii sp. nov.NeisseriaceaeRectal contents of Tibetan Plateau pika (Ochotona curzoniae) from Qinghai-Tibet Plateau, ChinaFacultative, nonmotile, catalase-positive, oxidase-positive, non-spore-forming, Gram-negative diplococcus; 1.0- to 1.2-mm-diam raised, moist, ivory/white colonies on nutrient agar; growth at 22°C–42°C; no growth on MacConkey agar; nitrate reduction, alkaline phosphatase, leucine arylamidase, acid phosphatase, glucose, fructose, sucrose, proline arylamidase, and gluconate positive; C8 esterase lipase, ornithine decarboxylase, erythritol, mannose, and xylitol negative109
Roseomonas wenyumeiae sp. nov.AcetobacteraceaeTibetan antelope (Pantholops hodgsonii) feces from Qinghai-Tibet Plateau, ChinaAerobic, motile, catalase-positive, oxidase-positive, non-spore-forming, Gram-negative coccus; 0.28- to 0.96-mm-diam pink, moist, opaque, circular, smooth colonies on Reasoner’s 2A agar; optimal growth at 28°C–30°C; glycerol, d-galactose, d-glucose, d-mannitol, valeric acid, l-arabinose, and β-glucuronidase positive; adipic acid, alkaline phosphatase, C4 esterase, C8 esterase lipase, leucine arylamidase, acid phosphatase, and l-arginine negative110
Gram-negative bacilli and coccobacilli    
Flavobacterium kingsejongi sp. nov.FlavobacteriaceaeFeces of penguins from AntarcticaAerobic, nonmotile, oxidase-positive, non-spore-forming, Gram-negative bacillus; yellow/orange, circular colonies on marine agar; optimal growth at 25°C; amygdalin, gelatin, starch, β-galactosidase, and tryptophan deaminase positive; nitrate reductase, l-arabinose, d-mannose, maltose, casein, and acid phosphatase negative111
Oceanisphaera avium sp. nov.AeromonadaceaeGut of cinereous vulture (Aegypius monachus) in South KoreaAerobic, motile, oxidase-positive, Gram-negative bacillus; smooth, circular, beige colonies on modified tryptone-yeast extract-salt agar; optimal growth at 15°C–25°C; positive for C4 esterase and d,l-lactic acid; negative for nitrate reduction, urease, alkaline phosphatase, valine arylamidase, and acid phosphatase; unable to assimilate glycogen, succinamic acid, l-proline, monomethyl ester, hydroxy-l-proline, d-serine, and α-ketoglutaric acid112
Gorillibacterium massiliense gen. nov., sp. nov.PaenibacillaceaeFeces of a gorilla from CameroonFacultative, nonmotile, oxidase-negative, non-spore-forming, Gram-negative bacillus; 0.5- to 1-mm-diam bright gray colonies on blood-enriched Columbia agar; optimal growth at 37°C; salicin, d-trehalose, d-melezitose, and glycogen positive; ribose, d-galactose, and amygdalin negative113e
Enterobacter oligotrophica sp. nov.EnterobacteriaceaeInitially recovered from leaf soil from Japan; recent report of isolation from a Caribbean lizard described in reference 114Aerobic, motile, oxidase-negative, non-spore-forming, Gram-negative bacillus; 5-mm-diam light yellow, circular, smooth, glistening colonies on nutrient broth plates; optimal growth at 20°C; growth observed in nutrient-deficient medium; l-rhamnose, d-sorbitol, d-arabinose, l-fucose, d-lyxose, arginine dihydrolase, lysine decarboxylase, and ornithine decarboxylase positive; d-sucrose, d-melibiose, d-turanose, Voges-Proskauer test, inositol, and d-arabitol negative115f
Iodobacter ciconiae sp. nov.ChromobacteriaceaeFecal sample from Oriental stork (Ciconia boyciana) collected from a zoo in South KoreaFacultative, nonmotile, oxidase-positive, Gram-negative bacillus; circular, beige, raised colonies on tryptic soy agar; optimal growth at 15°C; utilization of sucrose, acetoacetic acid, and l-lactic acid; N-acetylglucosamine, maltose, alkaline phosphatase, and valine arylamidase positive; d-mannose, d-fructose, l-histidine, d-arabinose, and arginine dihydrolase negative116
Klebsiella africana sp. nov.EnterobacteriaceaeInitial characterization from human isolate described in reference 117 and discussed previously in reference 118; recent report of isolation from Australian fruit bats (Pteropus poliocephalus) in reference 119General characteristics analogous to those of Klebsiella pneumoniae (urease, Voges-Proskauer test, ONPG, and lysine decarboxylase positive; indole and ornithine decarboxylase negative); differentiated from other K. pneumoniae complex members by its inability to metabolize d-arabitol117g
Rickettsia monacensis sp. nov.RickettsiaceaeInitially recovered in 2002 from Ixodes ricinus ticks in Europe; recent report of isolation from bats in reference 53Intracellular propagation in cultures of mouse L-929, African green monkey Vero, I. ricinus IRE11, Ixodes scapularis ISE6, and Dermacentor andersoni DAE100 cells; organisms found free within the cytoplasm of host cells (occasionally within nuclei); ultrastructure similar to those of other rickettsiae (size range, 1–1.5 μm by 0.3–0.4 μm)49g
Flavobacterium macacae sp. nov.FlavobacteriaceaeFeces of primate (Macaca mulatta) from ChinaAerobic, nonmotile, oxidase-positive, non-spore-forming, Gram-negative bacillus; yellow, viscous colonies on Luria-Bertani agar, nutrient agar, Reasoner’s 2A agar, and tryptic soy agar; optimal growth at 28°C; arabinose, C4 esterase, and C8 esterase lipase positive; gelatin hydrolysis, starch hydrolysis, amygdalin, gluconate, valine arylamidase, α-chymotrypsin, and adipate negative120
Psychrobacter pygoscelis sp. nov.MoraxellaceaeGentoo penguin chick (Pygoscelis papua) in Chilean AntarcticaAerobic, nonmotile, catalase-positive, oxidase-positive, Gram-negative coccobacillus; white/beige, circular, shiny, smooth colonies on tryptic soy agar; optimal growth at 4°C–30°C; urease, dextrin, and lipase positive; Tween 80, d-glucosamine, 5-keto-d-gluconic acid, alkaline phosphatase, and cystine arylamidase negative121
Pseudomonas leptonychotis sp. nov.PseudomonadaceaeAnal mucous membrane of seal (Leptonychotes weddellii) from AntarcticaMotile, oxidase-positive, Gram-negative bacillus; 2-mm-diam circular, yellow, irregular, smooth, shiny colonies on tryptic soy agar; optimal growth at 25°C; growth on MacConkey agar; beta-hemolysis not observed on blood agar; malonate, gelatin, casein, l-histidine, and d-serine positive; l-serine and DNase negative122
Apibacter raozihei sp. nov.WeeksellaceaeFeces of bats (Hipposideros spp. and Taphozous spp.) from ChinaFacultative, nonmotile, oxidase-negative, Gram-negative bacillus; 1- to 2-mm-diam shiny, convex, yellow colonies on sheep blood agar; optimal growth at 35°C; growth on MacConkey agar; β-galactosidase, N-acetyl-β-glucosaminidase, gentiobiose, and starch positive; negative for trypsin activity123
Faecalibacter macacae gen. nov., sp. nov.FlavobacteriaceaeFeces of monkey (Macaca assamensis) from ChinaAerobic, nonmotile, oxidase-positive, Gram-negative bacillus; 1- to 8-mm-diam colonies on tryptic soy agar; optimal growth at 37°C–42°C; starch, Tween 80, urease, and nitrate reductase positive; d-glucose and indole negative; reported susceptibility to ceftriaxone, chloramphenicol, ciprofloxacin, clindamycin, erythromycin, gentamicin, penicillin, polymyxin B, and vancomycin; reported resistance to ampicillin124
Paracoccus liaowanqingii sp. nov.RhodobacteraceaeTibetan antelope (Pantholops hodgsonii) feces from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, non-spore-forming, Gram-negative bacillus; circular, orange, shiny, thin colonies on marine agar; optimal growth at 28°C; N-acetylglucosamine, C14 lipase, and β-glucuronidase positive; d-fucose, leucine arylamidase, and α-glucosidase negative125
Bartonella kosoyi sp. nov.BartonellaceaeBlood of black rats (Rattus rattus) from IsraelCapnophilic, oxidase-negative, Gram-negative bacillus; 1- to 2-mm-diam smooth, circular colonies on chocolate agar; optimal growth at 37°C; arginine arylamidase and leucine arylamidase positive; proline, urease, and acetoin negative40
Lysobacter pythonis sp. nov.LysobacteraceaeRespiratory tract of a python (Python regius) experiencing respiratory distressMotile Gram-negative bacillus; yellow-pigmented colonies on peptone-yeast extract agar; growth also observed on 5% sheep blood agar and Sabouraud agar (weak growth); no growth on MacConkey agar; acetate, trans-aconitate, citrate, dl-lactate, oxoglutarate, and pyruvate positive; hydrolyzes pNP-phenyl-phosphonate and pNP-phosphoryl-choline; d-cellobiose, d-fructose, d-glucose, d-maltose, d-xylose, d-trehalose, d-ribose, fumarate, sucrose, salicin, l-aspartate, l-proline, and l-serine negative46h
Oceanivirga miroungae sp. nov.LeptotrichiaceaeOral cavity of wild northern elephant seal (Mirounga angustirostris) from CaliforniaFacultative, nonmotile, oxidase-negative, catalase-negative, non-spore-forming, Gram-negative bacillus; capable of growth on PPLO, Columbia, brain heart infusion, and Wilkins-Chalgren anaerobic agars supplemented with 10–15% serum (1- to 3-mm-diam smooth, creamy colonies that slightly resemble a fried egg); optimal growth at 34°C–37°C; mild alpha-hemolysis when grown on media containing blood; no growth on MacConkey agar; arginine arylamidase, glycogen, sucrose, urease, leucine arylamidase, valine arylamidase, α-chymotrypsin, and α-glucosidase positive; l-pyrrolidonyl-arylamidase, phenylphosphonate, alkaline phosphatase, and acid phosphatase negative126
Yersinia thracica sp. nov.YersiniaceaeFeces of wild boar (also isolated from pig, fish, and bird); archival isolate from reference laboratory in FranceFacultative, oxidase-negative, Gram-negative bacillus; 50% of strains nonmotile when tested at 28°C; 2.5-mm-diam circular colonies with deep-red center surrounded by a pale transparent border on cefsulodin-irgasan-novobiocin agar at 28°C; urease, ornithine decarboxylase (75% of tested strains), and β-galactosidase (75% of tested strains) positive; citrate, arginine dihydrolase, lysine decarboxylase, tryptophan deaminase, indole, Voges Proskauer test, and gelatinase negative127
Acinetobacter lanii sp. nov.MoraxellaceaeFeces of Tibetan wild ass (Equus kiang) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, oxidase-negative, Gram-negative coccobacillus; opaque, milky white, convex colonies on tryptic soy agar; optimal growth at 28°C; beta-hemolysis not observed on blood agar; β-alanine positive; citrate, l-arginine, l-glutamate, and gentisate negative128
Acinetobacter shaoyimingii sp. nov.MoraxellaceaeFeces of Tibetan wild ass (Equus kiang) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, oxidase-negative, Gram-negative coccobacillus; opaque, milky white, convex colonies on tryptic soy agar; optimal growth at 28°C; beta-hemolysis not observed on blood agar; β-alanine and l-glutamate positive; citrate, l-arginine, and gentisate negative; respiratory quinone distribution of 7.0% Q-8, 88.0% C-9, 4.1% Q-10128
Acinetobacter wanghuae sp. nov.MoraxellaceaeFeces of Tibetan wild ass (Equus kiang) from Qinghai-Tibet Plateau, ChinaAerobic, nonmotile, oxidase-negative, Gram-negative coccobacillus; opaque, milky white, convex colonies on tryptic soy agar; optimal growth at 28°C; beta-hemolysis not observed on blood agar; l-glutamate and β-alanine positive; citrate, l-arginine, and gentisate negative; respiratory quinone distribution of 3.6% Q-8, 89.3% Q-9, 7.0% Q-10128
Jinshanibacter xujianqingii sp. nov.BudviciaceaeCloacal content of snow finch (Montifringilla taczanowskii); taxon now considered to be homotypic synonym (Table 2)Facultative, motile, oxidase-negative, Gram-negative bacillus; small, circular, convex, cream-colored colonies on nutrient agar; optimal growth at 28°C; positive for acid phosphatase, esterase, leucine arylamidase, l-arabinose, and gentiobiose; negative for valine arylamidase, d-fructose, d-mannitol, hydrogen sulfide, salicin, and inositol129
Jinshanibacter zhutongyuii sp. nov.BudviciaceaeCloacal content of snow finch (Montifringilla taczanowskii)Facultative, motile, oxidase-negative, Gram-negative bacillus; small, circular, convex, cream-colored colonies on nutrient agar; optimal growth at 28°C; positive for acid phosphatase, esterase, leucine arylamidase, l-arabinose, gentiobiose, valine arylamidase, d-fructose, and d-mannitol; negative for hydrogen sulfide, salicin, and inositol129
Pelistega ratti sp. nov.AlcaligenaceaeFeces of rats (Rattus norvegicus) from ChinaFacultative, nonmotile, oxidase-positive, non-spore-forming, Gram-negative bacillus; 1-mm-diam convex, opaque, circular, milky white colonies on brain heart infusion-sheep blood agar; optimal growth at 37°C; gelatinase, C8 esterase lipase, and tyrosine arylamidase positive; l-lactate, malic acid, and valine arylamidase negative130
Spirabiliibacterium falconis comb. nov.PasteurellaceaeBronchopneumonia in a kestrelPhenotypic characteristics are largely consistent with those of other Pasteurellaceae; nonmotile, oxidase-negative, non-spore-forming, Gram-negative coccobacillus; does not require hemin for growth; pinpoint-sized to 1.5-mm-diam nonhemolytic colonies; growth may be enhanced by incubation on enhanced chocolate agar in 35°C CO2; V-factor requirement, d-xylose, trehalose, α-glucosidase, and β-glucosidase positive; catalase, sucrose, and esculin negative47
Spirabiliibacterium pneumoniae comb. nov.PasteurellaceaePneumonia in a pigeon hawkPhenotypic characteristics are largely consistent with those of other Pasteurellaceae; nonmotile, oxidase-negative, non-spore-forming, Gram-negative coccobacillus; does not require hemin for growth; pinpoint-sized to 1.5-mm-diam nonhemolytic colonies; growth may be enhanced by incubation on enhanced chocolate agar in 35°C CO2; catalase positive; d-xylose, sucrose, esculin, β-glucosidase, V-factor requirement, trehalose, and α-glucosidase negative; formerly classified as Bisgaard taxon 3247
Faecalibacter rhinopitheci sp. nov.FlavobacteriaceaeFeces of wild Yunnan snub-nosed monkey (Rhinopithecus bieti) from ChinaFacultative, nonmotile, oxidase-positive, Gram-negative bacillus; yellow colonies on tryptic soy agar; optimal growth at 28°C–35°C; d-glucose, α-galactosidase, β-glucosidase, α-mannosidase, and Tween 60 positive; cellulose and nitrate reduction negative131
Luteolibacter ambystomatis sp. nov.VerrucomicrobiaceaeSkin lesion of Anderson’s salamander (Ambystoma andersoni) from AustriaNonmotile, oxidase-negative, Gram-negative bacillus; optimal growth at 20°C–28°C under aerobic conditions; beta-hemolysis not observed on blood agar; leucine arylamidase, α-galactosidase, C4 esterase, and C8 esterase lipase positive; α-chymotrypsin, α-mannosidase, trypsin, α-glucosidase, and urease negative132
Paralysiella testudinis gen. nov., sp. nov.NeisseriaceaeInflamed cloaca of zoo-kept toad-headed turtle (Mesoclemmys nasuta)Aerobic, nonmotile, catalase-positive, oxidase-positive, Gram-negative bacillus; 5-mm-diam beige-pigmented, nonhemolytic colonies on 3.3× peptone-yeast extract agar; growth range at 20°C–37°C; no growth on MacConkey agar; d-arabinose, C4 esterase, leucine arylamidase, cysteine arylamidase, α-galactosidase, and d-mannose positive; d-melezitose, maltose, d-glucose, d-sorbitol, sucrose, dulcitol, raffinose, lactose, alkaline phosphatase, acid phosphatase, β-glucosidase, esculin, gelatinase, urease, and citrate negative133
Gram-positive anaerobes    
Bifidobacterium callitrichidarum sp. nov.BifidobacteriaceaeFeces of emperor tamarin (Sanguinus imperator) from ItalyAnaerobic (can also grow under aerophilic and microaerophilic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth colonies on tryptone-yeast extract agar; optimal growth at 45°C; hydrolyzes esculin; α-glucosidase, β-glucosidase, α-arabinosidase, and arginine dihydrolase positive; d-ribose, alkaline phosphatase, leucyl glycine arylamidase, glycine arylamidase, and urease negative134
Bifidobacterium vansinderenii sp. nov.BifidobacteriaceaeFeces of emperor tamarin (Sanguinus imperator)Anaerobic (can also grow under aerobic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, circular colonies on MRS agar; anaerobic growth range at 25°C–42°C; aerobic growth range at 35°C–42°C; strong fermentation of fructose, galactose, glucose, lactose, maltose, mannitol, melibiose, raffinose, and sucrose; weak fermentation of glycogen and xylose; arginine dihydrolase, α-glucosidase, and N-acetyl-β-glucosaminidase positive; β-glucuronidase, glutamic acid decarboxylase, pyroglutamic acid arylamidase, and serine arylamidase negative135
Bifidobacterium catulorum sp. nov.BifidobacteriaceaeFeces of common marmoset (Callithrix jacchus)Anaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on tryptone-yeast extract agar; optimal growth at 37°C; d-ribose, d-sorbitol, turanose, d-arabitol, α-glucosidase, alkaline phosphatase, and arginine arylamidase positive; glycerol, d-galactose, d-mannose, l-rhamnose, salicin, cellobiose, raffinose, urease, l-arginine, and alanine arylamidase negative136
Bifidobacterium aerophilum sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus L.) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 40°C; α-arabinosidase, N-acetyl-β-glucosaminidase, d-mannose, arbutin, d-maltose, and d-saccharose positive; l-xylose, gentiobiose, and arginine dihydrolase negative137i
Bifidobacterium avesanii sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus L.) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1.5- to 2.5-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 40°C; d-saccharose and l-xylose positive; α-arabinosidase, N-acetyl-β-glucosaminidase, d-mannose, arbutin, d-maltose, d-ribose, β-glucosidase, gentiobiose, and arginine dihydrolase negative137j
Bifidobacterium ramosum sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus L.) from ItalyAnaerobic (can also grow under microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 40°C; α-arabinosidase, d-ribose, gentiobiose, and arginine dihydrolase positive; N-acetyl-β-glucosaminidase, d-mannose, arbutin, d-maltose, β-glucosidase, d-saccharose, and l-xylose negative137i
Bifidobacterium callimiconis sp. nov.BifidobacteriaceaeFeces of Goeldi’s marmoset (Callimico goeldii)Anaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, circular colonies on MRS agar; optimal growth at 30°C–37°C; positive reactions for d-mannitol, d-arabinose, turanose, trehalose, d-sorbitol, and l-rhamnose; negative reaction for N-acetyl-d-galactosamine138
Bifidobacterium castoris sp. nov.BifidobacteriaceaeFeces of European beaver (Castor fiber)Anaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, circular colonies on MRS agar; optimal growth at 30°C–37°C; positive reactions for N-acetyl-d-galactosamine and trehalose; negative reactions for d-fructose and d-arabinose138
Bifidobacterium dolichotidis sp. nov.BifidobacteriaceaeFeces of Patagonian mara (Dolichotis patagonum)Anaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, circular colonies on MRS agar; optimal growth at 35°C–37°C; positive reactions for d-arabinose and d-xylose; negative reactions for N-acetyl-d-glucosamine, trehalose, and turanose138
Bifidobacterium goeldii sp. nov.BifidobacteriaceaeFeces of Goeldi’s marmoset (Callimico goeldii)Anaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.5-mm-diam white, circular colonies on MRS agar; optimal growth at 30°C–37°C; positive reactions for d-fructose and d-glucose; negative reactions for maltodextrin, d-mannitol, and trehalose138
Bifidobacterium samirii sp. nov.BifidobacteriaceaeFeces of black-capped squirrel monkey (Saimiri boliviensis subsp. peruviensis)Anaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, circular colonies on MRS agar; optimal growth at 35°C–40°C; positive reactions for d-fructose and raffinose; negative reactions for d-xylose, N-acetyl-d-glucosamine, turanose, and trehalose138
Bifidobacterium jacchi sp. nov.BifidobacteriaceaeFeces of baby common marmoset (Callithrix jacchus)Anaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, circular colonies on tryptone-yeast extract agar; optimal growth at 37°C; positive reactions for N-acetyl-β-glucosaminidase, d-ribose, d-galactose, and arbutin; negative reactions for melezitose, esculin, and alanine arylamidase139
Alloscardovia theropitheci sp. nov.BifidobacteriaceaeFeces of adult gelada baboon (Theropithecus gelada) from ItalyAnaerobic, nonmotile, catalase-positive, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam circular, white, opaque, smooth colonies on tryptone-yeast extract agar; optimal growth at 37°C; α-arabinosidase, α-fucosidase, α-mannosidase, leucyl glycine arylamidase, proline arylamidase, alanine arylamidase, glycine arylamidase, and arbutin positive; d-xylose, cellobiose, lactose, starch, glycogen, and turanose negative140
Bifidobacterium primatium sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 37°C; arginine arylamidase, leucyl glycine arylamidase, glycine arylamidase, d-galactose, d-sorbitol, arbutin, d-lactose, d-raffinose, glycogen, and d-arabitol positive; α-glucosidase, β-glucosidase, α-arabinosidase, d-adonitol, glutamyl glutamic acid, and amygdalin negative141h
Bifidobacterium scaligerum sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, nonhemolytic, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 37°C; α-arabinosidase, arginine arylamidase, leucyl glycine arylamidase, glycine arylamidase, α-glucosidase, β-glucosidase, d-galactose, amygdalin, d-lactose, d-raffinose, and glutamyl glutamic acid positive; d-sorbitol, arbutin, glycogen, d-adonitol, and d-arabitol negative141h
Bifidobacterium felsineum sp. nov.BifidobacteriaceaeFeces of emperor tamarin (Saguinus imperator) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, nonhemolytic, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 37°C; leucyl glycine arylamidase, α-glucosidase, β-glucosidase, d-adonitol, d-raffinose, and arbutin positive; α-arabinosidase, arginine arylamidase, glycine arylamidase, d-galactose, amygdalin, d-lactose, glutamyl glutamic acid, d-sorbitol, glycogen, and d-arabitol negative141h
Bifidobacterium simiarum sp. nov.BifidobacteriaceaeFeces of emperor tamarin (Saguinus imperator) from ItalyAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, Gram-positive bacillus; 1.5- to 2-mm-diam white, opaque, smooth, circular colonies on the surface of tryptone-yeast extract agar; embedded colonies are lens shaped or elliptical; optimal growth at 37°C; α-arabinosidase, arginine arylamidase, glycine arylamidase, α-glucosidase, β-glucosidase, d-galactose, amygdalin, d-lactose, and arbutin positive; leucyl glycine arylamidase, d-raffinose, glutamyl glutamic acid, d-sorbitol, glycogen, d-adonitol, and d-arabitol negative141h
Bifidobacterium erythrocebi sp. nov.BifidobacteriaceaeFeces of patas monkey (Erythrocebus patas) from CzechiaAnaerobic, nonmotile, non-spore-forming, Gram-positive bacillus; 2- to 3-mm-diam white, circular (with a 2nd slimy layer) colonies on the surface of supplemented Wilkins-Chalgren medium; embedded colonies are white and elliptical; optimal growth at 37°C; amygdalin, melibiose, raffinose, d-ribose, d-sorbitol, turanose, gentiobiose, and glycogen positive; arbutin, d-mannitol, d-mannose, melezitose, d-xylose, and salicin negative142
Bifidobacterium moraviense sp. nov.BifidobacteriaceaeFeces of Goeldi’s marmoset (Callimico goeldii) from CzechiaAnaerobic (can also grow under microaerophilic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 2- to 3-mm-diam white, circular colonies on the surface of supplemented Wilkins-Chalgren medium; embedded colonies are white and elliptical; optimal growth at 37°C; d-xylose and l-arabinose positive; amygdalin, melibiose, raffinose, d-ribose, d-sorbitol, turanose, gentiobiose, glycogen, arbutin, d-mannitol, d-mannose, melezitose, d-xylose, and salicin negative142
Bifidobacterium oedipodis sp. nov.BifidobacteriaceaeFeces of cotton-top tamarin (Saguinus oedipus) from CzechiaAnaerobic (can also grow under microaerophilic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 2- to 3-mm-diam white, circular colonies on the surface of supplemented Wilkins-Chalgren medium; embedded colonies are white and elliptical; optimal growth at 37°C; d-mannitol, d-mannose, melezitose, melibiose, raffinose, d-ribose, turanose, d-xylose, l-arabinose, and salicin positive; arbutin, d-sorbitol, and gentiobiose negative142
Bifidobacterium olomucense sp. nov.BifidobacteriaceaeFeces of mustached tamarin (Saguinus mystax) from CzechiaAnaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 1- to 2-mm-diam white, circular colonies on the surface of supplemented Wilkins-Chalgren medium; embedded colonies are white and elliptical; optimal growth at 37°C; amygdalin, arbutin, d-mannose, melezitose, melibiose, raffinose, d-xylose, gentiobiose, and salicin positive; d-mannitol, d-ribose, d-sorbitol, turanose, and glycogen negative142
Bifidobacterium panos sp. nov.BifidobacteriaceaeFeces of chimpanzee (Pan troglodytes) from CzechiaAnaerobic (can also grow under microaerophilic conditions), nonmotile, non-spore-forming, Gram-positive bacillus; 1-mm-diam transparent white, slightly irregular colonies on supplemented Wilkins-Chalgren medium; optimal growth at 37°C; d-mannose, melibiose, raffinose, d-ribose, turanose, and d-xylose positive; amygdalin, arbutin, cellobiose, d-mannitol, melezitose, d-sorbitol, gentiobiose, and salicin negative142
Bifidobacterium rousetti sp. nov.BifidobacteriaceaeFeces of Egyptian fruit bat (Rousettus aegyptiacus)Anaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, nonhemolytic, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on tryptone-yeast extract agar; optimal growth at 37°C; sorbitol, esculin, and glutamic acid decarboxylase positive; d-xylose, sucrose, N-acetyl-β-glucosaminidase, alkaline phosphatase, leucyl glycine arylamidase, and pyroglutamic acid arylamidase negative143k
Bifidobacterium vespertilionis sp. nov.BifidobacteriaceaeFeces of Egyptian fruit bat (Rousettus aegyptiacus)Anaerobic (can also grow under aerobic and microaerophilic conditions), nonmotile, catalase-negative, oxidase-negative, non-spore-forming, nonhemolytic, Gram-positive bacillus; 1- to 2-mm-diam white, opaque, smooth, circular colonies on tryptone-yeast extract agar; optimal growth at 37°C; d-xylose, sucrose, N-acetyl-β-glucosaminidase, alkaline phosphatase, leucyl glycine arylamidase, and pyroglutamic acid arylamidase positive; sorbitol, esculin, and glutamic acid decarboxylase negative143k
Lactobacillus xujianguonis sp. nov.LactobacillaceaeFeces of Himalayan marmot (Marmota himalayana) from Qinghai-Tibet Plateau, ChinaAnaerobic (can also grow under microaerophilic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; white, irregular, circular colonies on MRS agar; optimal growth at 37°C–40°C; positive reactions for potassium-5-ketogluconate, l-arabinose, and d-ribose; negative reactions for galactose, d-mannose, and trehalose144
Limosilactobacillus agrestis sp. nov.LactobacillaceaeJejunum of field vole (Microtus agrestis) from LithuaniaAnaerobic, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 2.2- to 5.2-mm-diam yellow, translucent, flat colonies on MRS agar; optimal growth at 37°C; positive reactions for l-arabinose and esculin; negative reactions for d-fructose, lactose, and glycerol145
Limosilactobacillus balticus sp. nov.LactobacillaceaeJejunum of yellow-necked mouse (Apodemus flavicollis) from LithuaniaAnaerobic, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1.2- to 3.2-mm-diam white, opaque, circular colonies on MRS agar; optimal growth at 37°C; positive reactions for l-arabinose, esculin, and maltose; negative reactions for erythritol, glycerol, and d-arabinose145
Limosilactobacillus fastidiosus sp. nov.LactobacillaceaeJejunum of root vole (Microtus oeconomus) from LithuaniaAnaerobic, nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1.2- to 2.2-mm-diam whitish, opaque, circular colonies on MRS agar; optimal growth at 37°C; positive reactions for l-arabinose and esculin; negative reactions for dulcitol, inositol, trehalose, and inulin145
Limosilactobacillus rudii sp. nov.LactobacillaceaeFeces of striped mouse (Rhabdomys pumilio) from the United StatesAnaerobic (can also grow under aerobic conditions), nonmotile, catalase-negative, non-spore-forming, Gram-positive bacillus; 1- to 2.2-mm-diam whitish, opaque, circular colonies on MRS agar; optimal growth at 37°C; positive reactions for maltose, lactose, and sucrose; negative reactions for l-xylose, d-fructose, and starch145
Lactobacillus nasalidis sp. nov.LactobacillaceaeForestomach contents of a captive proboscis monkey (Nasalis larvatus) from JapanAnaerobic (can also grow under aerobic conditions), nonmotile Gram-positive bacillus; 1- to 2-mm-diam white, convex, smooth colonies on MRS agar; optimal growth at 20°C–45°C; positive reactions for salicin, trehalose, and acid phosphatase; negative reactions for d-galactose, starch, and chymotrypsin146
Nanchangia anserum gen. nov., sp. nov.ActinomycetaceaeFeces of greater white-fronted goose (Anser albifrons) from ChinaAnaerobic, nonmotile, catalase-negative, oxidase-positive, non-spore-forming, Gram-positive bacillus; <1-mm-diam white, convex, opaque colonies on sheep blood agar; acid production from xylose, d-sorbitol, and trehalose; positive for α-galactosidase, β-galactosidase, and β-glucosidase; whole-cell sugars comprised of galactose, arabinose, and glucose147
Clostridium chrysemydis sp. nov.ClostridiaceaeFecal material of painted turtle (Chrysemys picta) from the United StatesAnaerobic, motile, rare-spore-forming, slender, Gram-positive bacillus; nonpigmented, beta-hemolytic colonies on tryptic soy agar with 5% sheep blood that grow under the surface of the medium; growth range at 25°C–45°C; lecithinase, alkaline phosphatase, arginine dihydrolase, β-galactosidase, α-glucosidase, β-glucuronidase, and nitrate reductase positive; indole, raffinose, urease, leucine arylamidase, α-fucosidase, and α-galactosidase negative148
Gram-negative anaerobes    
Phascolarctobacterium wakonense sp. nov.AcidaminococcaceaeFeces of common marmoset (Callithrix jacchus) from JapanAnaerobic, nonmotile, non-spore-forming, Gram-negative bacillus; 1-mm-diam circular, smooth, transparent, nonhemolytic colonies cultivated on peptone-yeast extract agar supplemented with succinate at 37°C; susceptibility to ≤0.5% bile; alkaline phosphatase, acid phosphatase, and esterase positive; nitrate reduction, urease, arginine dihydrolase, esculin, α-galactosidase, β-galactosidase, α-glucosidase, and β-glucosidase negative; succinate (propionic acid as the major end product) and pyruvate (propionic acid and acetic acid as end products) utilized for growth149
Spirochetes and curved bacteria    
Campylobacter blaseri sp. nov.CampylobacteraceaeCommon seal (Phoca vitulina) from The NetherlandsMicroaerophilic, nonmotile, oxidase-positive, catalase-positive, slightly curved, Gram-negative bacillus; 1- to 2-mm-diam raised, circular, smooth colonies on Columbia agar supplemented with 5% sheep blood; growth observed at 25°C, 37°C, and 42°C; urease, alkaline phosphatase, nitrate reduction, and indoxyl acetate positive; γ-glutamyl-transferase and hippurate negative; susceptible to cephalothin; most strains susceptible to nalidixic acid; growth slightly inhibited in the absence of hydrogen150
Helicobacter labacensis sp. nov.HelicobacteraceaeGastric mucosa of red fox (Vulpes vulpes) from SloveniaMicroaerophilic, motile, oxidase-positive, catalase-positive, large helical, Gram-negative bacillus; capable of thin-film growth on fresh, moist blood agar and chocolate agar at 37°C (not at 25°C or 42°C); alkaline phosphatase, esterase, γ-glutamyl transpeptidase, nitrate reduction, and urease positive; indoxyl acetate and hippurate negative; susceptible to cephalothin and nalidixic acid151
Helicobacter mehlei sp. nov.HelicobacteraceaeGastric mucosa of red fox (Vulpes vulpes) from SloveniaMicroaerophilic, motile, oxidase-positive, catalase-positive, large helical, Gram-negative bacillus; capable of thin-film growth on fresh, moist blood agar and chocolate agar at 37°C (not at 25°C or 42°C); esterase, γ-glutamyl transpeptidase, and urease positive; alkaline phosphatase, indoxyl acetate, nitrate reduction, and hippurate negative; susceptible to cephalothin and nalidixic acid151
Helicobacter vulpis sp. nov.HelicobacteraceaeGastric mucosa of red fox (Vulpes vulpes) from SloveniaMicroaerophilic, motile, oxidase-positive, catalase-positive, large helical, Gram-negative bacillus; capable of thin-film growth on fresh, moist blood agar and chocolate agar at 37°C (not at 25°C or 42°C); esterase, γ-glutamyl transpeptidase, alkaline phosphatase, nitrate reduction, and urease positive; indoxyl acetate and hippurate negative; susceptible to cephalothin and nalidixic acid151
Helicobacter enhydrae sp. nov.HelicobacteraceaeInflamed gastric tissue of southern sea otter from California; nonvalidly published as “H. enhydrae sp. nov.” until 2020Microaerophilic, motile, oxidase-positive, catalase-positive, slightly curved, Gram-negative bacillus; entire colonies observed on blood agar after 3–5 days of incubation at 37°C and 42°C (not at 25°C); growth in 1% glycine; γ-glutamyl transpeptidase, urease, indoxyl acetate, alkaline phosphatase, and nitrate reduction negative; resistant to cephalothin; susceptible to nalidixic acid56l
Leptospira tipperaryensis sp. nov.LeptospiraceaeGreater white-toothed shrew (Crocidura russula) from IrelandNo phenotypic characterization provided152m
Campylobacter novaezeelandiae sp. nov.CampylobacteraceaeBird feces (3 starlings, 1 duck) from New ZealandMicroaerophilic, motile, oxidase-positive, Gram-negative, spiral bacillus; 0.5- to 1-mm-diam gray, smooth, entire colonies on Columbia agar with strong, dark alpha-hemolysis; growth at 37°C and 42°C but faster growth exhibited at 37°C; catalase, indoxyl acetate, and nitrate reduction positive; hippurate hydrolysis, alkaline phosphatase, hydrogen sulfide, and urease negative; resistant to cephalothin; susceptible to nalidixic acid153
Campylobacter aviculae sp. nov.CampylobacteraceaeFeces of laboratory-maintained zebra finch (Taeniopygia guttata) from the United StatesMicroaerophilic, motile, oxidase-positive, Gram-negative, slightly curved bacillus; growth at 37°C and 42°C but no growth at 25°C; variable growth in 1% glycine; hippurate hydrolysis positive; catalase, urease, indoxyl acetate, and γ-glutamyl transpeptidase negative; resistant to cephalothin; susceptible to nalidixic acid154n
Campylobacter estrildidarum sp. nov.CampylobacteraceaeFeces of laboratory-maintained zebra finch (Taeniopygia guttata) from the United StatesMicroaerophilic, motile, oxidase-positive, Gram-negative, slightly curved bacillus; growth at 37°C and 42°C but no growth at 25°C; variable growth in 1% glycine; variable catalase and hippurate hydrolysis activities; urease, indoxyl acetate, and γ-glutamyl transpeptidase negative; resistant to cephalothin; variable resistance to nalidixic acid154n
Campylobacter taeniopygiae sp. nov.CampylobacteraceaeFeces of laboratory-maintained zebra finch (Taeniopygia guttata) from the United StatesMicroaerophilic, motile, oxidase-positive, Gram-negative, slightly curved bacillus; growth at 37°C and 42°C but no growth at 25°C; no growth in 1% glycine; hippurate hydrolysis and catalase positive; urease, indoxyl acetate, and γ-glutamyl transpeptidase negative; resistant to cephalothin; variable resistance to nalidixic acid154n
Helicobacter monodelphidis sp. nov.HelicobacteraceaeColon of opossum (Monodelphis domestica) with cloacal prolapse from the United StatesMicroaerophilic, motile, oxidase-positive, catalase-positive, slender, slightly curved, Gram-negative bacillus; capable of spreading-film growth on blood agar at 37°C (not at 25°C or 42°C); γ-glutamyl transpeptidase and alkaline phosphatase positive; urease and indoxyl acetate negative; resistant to cephalothin and nalidixic acid57
Helicobacter didelphidarum sp. nov.HelicobacteraceaeFeces of opossum (Monodelphis domestica) with cloacal prolapse from the United StatesMicroaerophilic, motile, oxidase-positive, catalase-positive, fusiform, Gram-negative bacillus; capable of spreading-film growth on blood agar at 37°C (not at 25°C or 42°C); γ-glutamyl transpeptidase and urease positive; indoxyl acetate negative; resistant to cephalothin; susceptible to nalidixic acid57
Campylobacter vulpis sp. nov.CampylobacteraceaeCecal contents of wild red fox (Vulpes vulpes) from ItalyMicroaerophilic, motile, oxidase-positive, catalase-negative, sigmoid-shaped, Gram-negative bacillus; 2- to 3-mm-diam gray, translucent, flat, irregular-edged, alpha-hemolytic colonies on nutrient agar supplemented with 5% sheep blood; growth observed at 37°C and 42°C (no growth at 25°C); indoxyl acetate positive; most strains reduce nitrate; ~50% of strains are alkaline phosphatase positive; urease, nitrate, and hippurate negative; does not require hydrogen supplementation; most strains grow in 1% glycine; susceptible to nalidixic acid and cephalothin155c
Mollicutes    
Mycoplasma tullyi sp. nov.MycoplasmataceaeDead Humboldt penguin (Spheniscus humboldti) from the United KingdomPleomorphic (some are spherical and some are flask shaped), cell wall-deficient organisms that are filterable through 220- and 450-nm membranes; fried-egg-shaped colonies grow within 2 days; optimal growth at 37°C; serum or sterol required for growth; acid produced from glucose; no hydrolysis of arginine or urea; resistant to penicillin60
Mycoplasma enhydrae sp. nov.MycoplasmataceaeOropharynx of wild southern sea otter (Enhydra lutris nereis) from CaliforniaCell wall-deficient organisms that are filterable through 220- and 450-nm membranes; fried-egg-shaped colonies on SP4 agar with arginine grow within 3–5 days; optimal growth at 35°C–37°C; serum or sterol required for growth; no acid produced from glucose; hydrolyzes arginine but not urea; resistant to penicillin156
Mycoplasma hafezii sp. nov.MycoplasmataceaeTrachea of healthy captive adult peregrine falcon (Falco peregrinus)Nonhelical, nonmotile cells that are filterable through 450-nm membranes; fried-egg-shaped colonies on solid SP4 medium grow within 24 h; optimal growth at 37°C; sterol required for growth; acid produced from glucose; no hydrolysis of arginine or urea157
Ureaplasma miroungigenitalium sp. nov.MycoplasmataceaeVagina of wild northern elephant seal (Mirounga angustirostris) from CaliforniaCell wall-deficient organisms that are filterable through 450-nm membranes and less filterable through 220-nm membranes; tiny, rough, granular colonies on A8 agar; optimal growth at 35°C–37°C; serum required for growth; hydrolysis of urea but not arginine; resistant to penicillin and lincomycin; phylogenetic analysis of 16S rRNA and rpoB genes important for final differentiation158
Ureaplasma zalophigenitalium sp. nov.MycoplasmataceaeVagina and preputium of wild sea lion (Zalophus californianus) from CaliforniaCell wall-deficient organisms that are filterable through 450-nm membranes and less filterable through 220-nm membranes; tiny, rough, granular colonies on A8 agar; optimal growth at 35°C–37°C; serum required for growth; hydrolysis of urea but not arginine; resistant to penicillin and lincomycin; phylogenetic analysis of 16S rRNA and rpoB genes important for final differentiation158
Mycoplasma procyoni sp. nov.MycoplasmataceaeOral cavity of raccoon (Procyon lotor) from CanadaFacultative, cell wall-deficient organisms that are filterable through 220- and 450-nm membranes; fried-egg-shaped colonies on PPLO agar with glucose grow within 5–7 days; optimal growth at 35°C–37°C; serum or sterol required for growth; acid produced from glucose; no hydrolysis of arginine or urea; resistant to penicillin G159o
Mycoplasma nasistruthionis sp. nov.MycoplasmataceaeOstrich (Struthio camelus) with respiratory diseaseNear-spherical, nonmotile cells filterable through a 220-nm membrane; cells do not revert to walled forms in the absence of antibiotics; fried-egg-shaped colonies on solid medium within 48 h; optimal growth at 37°C; serum or sterol required for growth; weak acid produced from glucose; no hydrolysis of arginine, esculin, casein, gelatin, or urea62p
Mycoplasma struthionis sp. nov.MycoplasmataceaeOstrich (Struthio camelus) with respiratory diseaseNear-spherical (some are flask shaped with tip-like structures), nonmotile cells filterable through a 220-nm membrane; cells do not revert to walled forms in the absence of antibiotics; fried-egg-shaped colonies on solid medium within 48 h; optimal growth at 37°C; serum or sterol required for growth; acid not produced from glucose; hydrolyzes arginine; no hydrolysis of esculin, casein, gelatin, or urea62p
a
Taxonomic designation subsequently accepted in validation list no. 182 (160).
b
Taxonomic designation subsequently accepted in validation list no. 184 (161).
c
Taxonomic designation subsequently accepted in validation list no. 201 (162).
d
Taxonomic designation subsequently accepted in validation list no. 183 (163).
e
Taxonomic designation subsequently accepted in validation list no. 174 (164).
f
Taxonomic designation subsequently accepted in validation list no. 191 (165).
g
Taxonomic designation subsequently accepted in validation list no. 189 (166).
h
Taxonomic designation subsequently accepted in validation list no. 192 (167).
i
Taxonomic designation subsequently accepted in validation list no. 175 (168).
j
Taxonomic designation subsequently accepted in validation list no. 185 (169).
k
Taxonomic designation subsequently accepted in validation list no. 198 (170).
l
Taxonomic designation subsequently accepted in validation list no. 194 (171).
m
Taxonomic designation subsequently accepted in validation list no. 195 (172).
n
Taxonomic designation subsequently accepted in validation list no. 202 (173).
o
Taxonomic designation subsequently accepted in validation list no. 193 (174).
p
Taxonomic designation subsequently accepted in validation list no. 197 (175).
q
MRS, De Man-Rogosa-Sharpe; ONPG, o-nitrophenyl-β-d-galactopyranoside.
TABLE 2
TABLE 2 Revised bacterial taxa relative to nondomestic wildlife animal sources of veterinary material from January 2018 through December 2021
Former nameRevised nameOther informationReference(s)
 Gram-positive bacilli   
Arthrobacter nasiphocaeFalsarthrobacter nasiphocae gen. nov., comb. nov.Initial description and recovery of the former A. nasiphocae from common seal in reference 176177
Limosilactobacillus reuteriLimosilactobacillus reuteri subsp. kinnaridis subsp. nov.Initial description and recovery of Lactobacillus reuteri in reference 178 and accepted in reference 179; taxon transitioned to Limosilactobacillus genus designation in 2020, as described in reference 180; L. reuteri subsp. kinnaridis subsp. nov. observed in the gastrointestinal tract of a pheasant145
Actinomyces liubingyangiiBoudabousia liubingyangii comb. nov.Initial description and recovery of the former A. liubingyangii from vulture (Gypaetus barbatus) in reference 18130
Actinomyces tangfeifaniiBoudabousia tangfeifanii comb. nov.Initial description and recovery of the former A. tangfeifanii in reference 78 (Table 1)30
Actinomyces marimammaliumBoudabousia marimammalium comb. nov.Initial description and recovery of the former A. marimammalium from 2 dead seals and a porpoise in reference 6768a
Gram-negative bacilli and coccobacilli   
Flavobacterium cetiMyroides ceti comb. nov.Initial description and recovery of the former F. ceti from beaked whales (Ziphius cavirostris) in reference 182183b
Duganella danionisPseudoduganella danionis sp. nov.Initial description and recovery of the former D. danionis from beaked whales in reference 184 and accepted in reference 185; initial description and recovery of P. danionis from zebrafish in reference 186; D. danionis is a later homotypic synonym of P. danionis186
Jinshanibacter xujianqingiiInsectihabitans xujianqingii comb. nov.Initial description and recovery of the former J. xujianqingii in reference 129 (Table 1)187
Pseudomonas hussainiiAtopomonas hussainii comb. nov.Initial description and recovery of the former P. hussainii from seashore bird droppings in reference 188189
Gram-positive anaerobes   
Asaccharobacter celatusAdlercreutzia equolifaciens subsp. celatus subsp. nov.Initial description and recovery of the former A. celatus from rat cecum in reference 19068a
Gram-negative anaerobes   
Bacteroides chinchillaePhocaeicola chinchillae comb. nov.Initial description and recovery of the former B. chinchillae from chinchilla (Chinchilla lanigera) feces in reference 191183b
Spirochetes   
Borrelia bavariensisBorrelia garinii subsp. bavariensisInitial description and recovery of the former B. bavariensis in reference 192 and accepted in reference 193; the significance of this organism in oceanic avian species is discussed in reference 194195c
Mollicutes   
Mycoplasma lagogenitaliumMesomycoplasma lagogenitalium comb. nov.Initial description and recovery of the former M. lagogenitalium from preputial smegma of Afghan pika (Ochotona rufescens rufescens) in reference 6561a
Mycoplasma moatsiiMesomycoplasma moatsii comb. nov.Initial description and recovery of the former M. moatsii from imported grivet monkeys (Cercopithecus aethiops) in reference 19661a
Mycoplasma phocicerebraleMetamycoplasma phocicerebrale comb. nov.Initial description and recovery of the former M. phocicerebrale from harbor seals (Phoca vitulina L.) in reference 19761a
Mycoplasma agassiziiMycoplasmopsis agassizii comb. nov.Initial description and recovery of the former M. agassizii from upper respiratory tract specimens of 2 species of tortoises (Gopherus spp.) in reference 19861a
Mycoplasma felifauciumMycoplasmopsis felifaucium comb. nov.Initial description of the former M. felifaucium from puma respiratory tract specimens in reference 199 and accepted in reference 20061a
Mycoplasma alligatorisMycoplasmopsis alligatoris comb. nov.Initial description of the former M. alligatoris from alligator polyserositis and multifocal arthritis involving multiple organs (peripheral blood, synovial fluid, and cerebrospinal fluid specimens) in reference 6661a
Mycoplasma phocirhinisMycoplasmopsis phocirhinis comb. nov.Initial description and recovery of the former M. phocirhinis from harbor seals (Phoca vitulina L.) in reference 19761a
Mycoplasma microtiMalacoplasma microti comb. nov.Initial description and recovery of the former M. microti from prairie vole (Microtus ochrogaster) in reference 20161a
Mycoplasma neophronisMetamycoplasma neophronis comb. nov.Initial description and recovery of the former M. neophronis from the upper respiratory tract of Canarian Egyptian vultures (Neophron percnopterus majorensis) in reference 20261a
Mycoplasma ciconiaeMycoplasmopsis ciconiae comb. nov.Initial description and recovery of the former M. ciconiae from the trachea of white stork nestlings (Ciconia ciconia) in reference 203 and accepted in reference 20461a
a
Taxonomic designation subsequently accepted in validation list no. 184 (161).
b
Taxonomic designation subsequently accepted in validation list no. 193 (174).
c
Taxonomic designation subsequently accepted in validation list no. 194 (171).

Novel taxa.

Multiple new taxa have been accepted within the families Streptococcaceae and Staphylococcaceae. With respect to the Streptococcaceae, the majority of new additions were associated with disease in their host animal species. For example, Lactococcus petauri sp. nov. (18) was isolated from a facial abscess in a sugar glider (Petaurus breviceps). Sugar gliders are small arboreal marsupials indigenous to Australia and New Guinea that are frequently kept as pets. Although they are omnivorous, sugar gliders have a specialized dental structure that allows them to peel bark from trees to allow them access to tree sap or gum. As a result of their unique feeding behaviors, they are prone to diseases of the oral cavity and facial abscesses caused by trauma. Based on 16S rRNA gene sequencing and single nucleotide polymorphism analyses, Lactococcus petauri sp. nov. was determined to be most closely related to Lactococcus garvieae (18). L. garvieae was first isolated from a cow with mastitis and was granted the taxon Streptococcus garvieae (19). It is also a common fish pathogen that has been associated with gastrointestinal disorders and infective endocarditis in humans and has been described as an emerging zoonotic pathogen (2023). Biochemically, L. petauri sp. nov. can be differentiated from L. garvieae based on the ability of L. petauri sp. nov. to produce acid from sucrose and d-tagatose (18). Interestingly, L. petauri is also now understood to be a significant pathogen of aquatic animals (24).
Four additional members of the Streptococcaceae, Streptococcus respiraculi sp. nov., Streptococcus catagoni sp. nov., Streptococcus pacificus sp. nov., and Streptococcus zalophi sp. nov., were isolated from the respiratory tracts of their host species (2527). These species cause infections in locations similar to those of other members of the genus, namely, the lungs and tonsils, with potential migration to the brain in severe cases. S. respiraculi sp. nov. (25) was isolated from the respiratory tract of a Himalayan marmot (Marmota himalayana). The Himalayan marmot is an important reservoir of Yersinia pestis, and cases of human plague have been associated with the disruption of the habitat of Himalayan marmots as well as the skinning and eating of these animals (28, 29). Also identified from the Himalayan marmot were three novel Gram-positive bacilli, Actinomyces marmotae sp. nov. (30), Corynebacterium lizhenjunii sp. nov. (31), and Corynebacterium zhongnanshanii sp. nov. (32). Understanding the respiratory tract microbiota of Himalayan marmots could have direct implications for public health and may influence future investigations in this host.
Streptococcus catagoni sp. nov. (26) was isolated from the lungs, tonsils, and brains of Chacoan peccaries (Catagonus wagneri). The Chacoan peccary is native to the Gran Chaco region of Paraguay, Bolivia, and Argentina. This species was thought to be extinct until its discovery in 1971. This host is currently under threat due to human encroachment on its territory. The type strain of Streptococcus catagoni sp. nov. was isolated from a young female animal with purulent pneumonia. Phylogenetic analysis determined that S. catagoni sp. nov. is most closely related to Streptococcus didelphis and can be distinguished by a positive Voges-Proskauer test and the production of acid from d-sorbitol and glycogen. Streptococcus pacificus sp. nov. and Streptococcus zalophi sp. nov. (27) were isolated from the lung tissue of a California sea lion (Zalophus californianus) with domoic acid toxicity. Domoic acid is a neurotoxin that is produced during blooms of the alga Pseudonitzschia australis and accumulates in small fish that are consumed by sea lions. Subsequent feeding may cause damage to the brain and heart and may impact the subsequent immune response mounted by the sea lion (33, 34).
Within the Staphylococcaceae, two new members were described in healthy animals, Staphylococcus durrellii sp. nov. from the oropharynx and Staphylococcus lloydii sp. nov. from the skin of captive Livingstone’s fruit bats (Pteropus livingstonii) (35). Livingstone’s fruit bat is an endangered bat from the Comoros Islands between Africa and northern Madagascar. These two staphylococcal species are most closely related to Staphylococcus kloosii. They can be differentiated from each other through the production of acetoin in the Voges-Proskauer test and the production of acid from maltose by S. lloydii sp. nov. Both novel species can be differentiated from S. kloosii through the production of urease by S. kloosii (35).
Within the Gram-positive bacilli, Corynebacterium silvaticum sp. nov. was identified from lesions consistent with caseous lymphadenitis, including lamellar lymph node abscesses with an “onion ring” appearance in wild boar (Sus scrofa) and roe deer (Capreolus capreolus) from Germany (36). Wild boar and roe deer are commonly hunted animals and are important economically and as a human food source. Corynebacterium silvaticum sp. nov. is most closely related to Corynebacterium ulcerans and Corynebacterium pseudotuberculosis, both of which are human pathogens, with C. pseudotuberculosis being a significant pathogen in small ruminants and horses (3739). C. silvaticum sp. nov. is similar to C. ulcerans in that it ferments glucose, ribose, and maltose but (similar to C. pseudotuberculosis) does not utilize d-xylose, mannitol, lactose, sucrose, and glycogen (36).
Gram-negative bacilli and coccobacilli comprise one of the largest groups of organisms routinely isolated from veterinary patients. A notable example from the taxa presented in Table 1, Bartonella kosoyi sp. nov., was isolated from the blood of black rats (Rattus rattus) from Israel (40). The genus Bartonella includes nearly 40 species at the time of writing, with these organisms being hemotropic, facultative, intracellular bacteria that are transmitted by arthropod vectors (40). Bartonella kosoyi sp. nov. is most closely related to the zoonotic species Bartonella elizabethae (41). B. elizabethae has previously been reported from dogs (Canis lupus subsp. familiaris) (42). Although there are currently no reported human cases of infection by B. kosoyi sp. nov., it has now been isolated from rodents from Thailand, Sri Lanka, Myanmar, and the Canary Islands (4345).
Another novel Gram-negative bacillus is Lysobacter pythonis sp. nov. (46), isolated from the respiratory tract of a python (Python regius) experiencing respiratory distress, and a second isolate was obtained from a python with a respiratory infection following antibiotic therapy. 16S rRNA gene, 16S-23S intergenic spacer region, and groEL sequences from both isolates were found to be most similar to those of Lysobacter tolerans, although similarities to Luteimonas aestuarii and Luteimonas mephitis were noted (46). Colonies of L. pythonis sp. nov. are nonhemolytic and yellow and do not grow on MacConkey agar but do grow weakly on Sabouraud agar. Phenotypic differentiation between L. pythonis sp. nov. and closely related and similar organisms required several biochemical tests, including the assimilation of acetate, trans-aconitate, citrate (weakly), dl-lactate, oxoglutarate, and pyruvate (46).
Within the Pasteurellaceae are two novel organisms that cause pneumonia in birds, Spirabiliibacterium falconis comb. nov., isolated from a kestrel (Falco tinnunculus) with bronchopneumonia, and Spirabiliibacterium pneumoniae comb. nov., isolated from a pigeon hawk (Falco columbarius) (47). These two organisms were previously classified as belonging to Bisgaard taxon 14, which included bacteria from birds with respiratory tract infections (48). Bisgaard and Christensen (47) provided a highly informative, substantive review of changes in nomenclature within taxa 14 and 32. They also established the S. falconis comb. nov. and S. pneumoniae comb. nov. taxa based on 16S rRNA gene analysis and whole-genome sequencing and provided supportive phenotypic data that differentiate these two organisms from each other and their close relative Spirabiliibacterium mucosae sp. nov.
Rickettsia monacensis sp. nov. (49) is an obligate intracellular organism that was initially recovered in 2002 from Ixodes ricinus ticks in Europe and was recently reported in bats as well as an apparently healthy dog from Cape Verde (50). R. monacensis sp. nov. is a member of the spotted fever group that causes Mediterranean spotted fever in humans and has been reported from dogs, bats, and a migratory songbird captured in Texas (5155). The identification of R. monacensis sp. nov. in a tick found on a migratory bird highlights the potential for the expansion of the range of this organism.
Helicobacter enhydrae sp. nov., Helicobacter monodelphidis sp. nov., and Helicobacter didelphidarum sp. nov. (56, 57) are selected curved bacteria listed in Table 1. H. enhydrae sp. nov. was isolated from inflamed tissue from the gastric body of a southern sea otter (Enhydra lutris) from California but was nonvalidly published as “H. enhydrae sp. nov.” until 2020 (56). Enhydra lutris is a threatened species that has been slow to recover due to substantial infectious disease challenges. In addition to the valid publication of H. enhydrae sp. nov., Shen et al. describe the impact of bacterial populations on E. lutris and the origin of the tissues from which H. enhydrae sp. nov. was originally isolated (56). H. monodelphidis sp. nov. and H. didelphidarum sp. nov. (57) were isolated from the colons of gray short-tailed opossums (Monodelphis domestica) with cloacal prolapse. Gray short-tailed opossums are a widely used laboratory animal species, and cloacal (rectal) prolapse has been described as a common health problem in laboratory-reared opossums (58, 59). In a study of 94 opossums from two different colonies, 40 helicobacter strains were isolated (57). Of these isolates, 25 were H. monodelphidis sp. nov., while the remaining 15 isolates were H. didelphidarum sp. nov. based on 16S rRNA gene, hsp60, and gyrB analyses. Detailed descriptions and images of the lesions were provided, along with detailed histories of the animals and the disease. These novel Helicobacter spp. should be considered in gray short-tailed opossums with rectal prolapse.
Within the class Mollicutes, three novel Mycoplasma species associated with disease in avian species were described. Mycoplasma tullyi sp. nov. was isolated from the liver of a deceased 10-day-old Humboldt penguin (Spheniscus humboldti) in the United Kingdom (60). While it was unclear how the organism infected the penguin chick, the isolation of this organism as the sole agent from the liver supports the hypothesis that it was associated with disease in this host. M. tullyi sp. nov. was also isolated as part of the mixed upper respiratory tract microbiota from healthy adult Humboldt penguins. In initial pathogenesis studies, M. tullyi sp. nov. caused ciliostasis in chicken embryo tracheal organ cultures and caused mortality and stunting of growth in embryonated chicken egg tests (60). M. tullyi sp. nov. is most closely related to Mycoplasma gallisepticum, the taxonomy of which has recently been revised to Mycoplasmoides gallisepticum comb. nov. (61).
Similarly, in a study of 10 ostriches with respiratory disease from farms in Namibia, Mycoplasma nasistruthionis sp. nov. and Mycoplasma struthionis sp. nov. (62) were isolated from 2 different ostriches (Struthio camelus). M. nasistruthionis sp. nov. is most closely related to Mycoplasma verecundum, now known as Mycoplasmopsis verecunda comb. nov. (61, 62). M. struthionis sp. nov. is most closely related to Mycoplasma falconis, the taxonomy of which has transitioned to Metamycoplasma falconis comb. nov. (61, 62). In light of additional changes to Mycoplasma spp. described in Table 2, it seems likely that the designations of M. tullyi sp. nov., M. nasistruthionis sp. nov., and M. struthionis sp. nov. may undergo revision at the genus level.

Taxonomic revisions.

As alluded to above, a major revision to the phylogenetic framework within the phylum “Tenericutes” (recently reclassified as the phylum Mycoplasmatota [63]) was based on the evaluation of the genome sequences of 140 members of the phylum (61). The novel order Mycoplasmoidales was proposed to include the families Metamycoplasmataceae fam. nov. and Mycoplasmoidaceae fam. nov. Included within Metamycoplasmataceae fam. nov. were the newly proposed genera Mesomycoplasma gen. nov., Metamycoplasma gen. nov., and Mycoplasmopsis gen. nov. Mycoplasmoidaceae fam. nov. included the newly proposed genera Malacoplasma gen. nov. and Mycoplasmoides gen. nov. Species names were maintained, and the novel genus designations carry the same first letter as Mycoplasma, simplifying the transitions listed in Table 2. Revised taxa impacting domestic veterinary hosts have been summarized in a recent report (11), while additional revisions for the class Mollicutes were reviewed previously (64). The class Mollicutes affects a wide variety of wildlife species in a variety of ways, from being present in the urogenital tract of healthy Afghan pikas (65) to causing polyserositis and multifocal arthritis in alligators (66). The broad impact of these organisms on animals and the magnitude of the changes to the phylum make this likely the most significant nomenclature revision discussed in this report.
In addition to changes in Mycoplasma spp., organisms that cause disease in wildlife have undergone taxonomic revision. Notably, Actinomyces marimammalium, which was originally isolated from two dead seals and a porpoise (67), has transitioned from the Actinomyces genus to Boudabousia marimammalium comb. nov. (68). This organism was originally isolated from multiple organs (lung, spleen, liver, kidney, and mesenteric lymph node) of a dead male hooded seal (Cystophora cristata) that had pneumonia, the lung of a dead harbor porpoise (Phocoena phocoena), and the small intestine of a dead gray seal (Halichoerus grypus) that was shot (67). Although speculative, the presence of this organism in the intestine of an otherwise healthy gray seal that died from trauma, the respiratory tract of a porpoise, and multiple locations in a seal with pneumonia suggests that this organism may be an opportunistic rather than a primary pathogen.

CONCLUSION

While the numerous changes in the taxonomy of bacteria isolated from wildlife represent a challenge for veterinary microbiology laboratories, detailed genetic knowledge of these bacteria and their relationships with better-studied organisms may offer insights into their roles in their wildlife hosts. Given the challenges of studying bacterial pathogenesis in wildlife, the results of these comprehensive phylogenetic studies may provide clues to help those who manage and care for these unique animal populations and ultimately may promote ecosystem health. Here, we strive to summarize the additions and changes to the taxonomy of bacteria associated with wildlife from 2018 through 2021 and to provide insights into the relevance of these agents in their host species. The continuing efforts to describe the microbiota in various animal species and to determine the clinical significance of novel organisms indicate that this effort will be sustainable in the future.

ACKNOWLEDGMENT

This report was not subject to influence from any funding agency in the public, commercial, or not-for-profit sectors.

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Published In

cover image Journal of Clinical Microbiology
Journal of Clinical Microbiology
Volume 61Number 222 February 2023
eLocator: e01425-22
Editor: Romney M. Humphries, Vanderbilt University Medical Center
PubMed: 36533958

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Published online: 19 December 2022

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Keywords

  1. bacterial taxonomy
  2. veterinary microbiology

Contributors

Authors

Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, USA
Claire R. Burbick
Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, USA
Department of Medical Laboratory Science, Marquette University, Milwaukee, Wisconsin, USA
Amanda Zapp
Department of Medical Laboratory Science, Marquette University, Milwaukee, Wisconsin, USA
Elizabeth Thelen
Department of Medical Laboratory Science, Marquette University, Milwaukee, Wisconsin, USA
Maia Villaflor
Department of Medical Laboratory Science, Marquette University, Milwaukee, Wisconsin, USA

Editor

Romney M. Humphries
Editor
Vanderbilt University Medical Center

Notes

The authors declare no conflict of interest.

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