Name: Bacteroides Castellani and Chalmers 1919 (Approved Lists 1980)

Category: Genus

Proposed as: gen. nov.

Etymology: Bac.ter.o.i’des. N.L. masc. n. bacter, rod; L. adj. suff. -oides, ressembling, similar; from Gr. neut. adj. suff. -eides, resembling, similar; from Gr. neut. n. eîdos, that which is seen, form, shape, figure; N.L. masc. n. Bacteroides, rodlike

Gender, pronunciation: masculine (stem: Bacteroid-), bak-ter-o-I-des

Type species: Bacteroides fragilis (Veillon and Zuber 1898) Castellani and Chalmers 1919 (Approved Lists 1980)

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective publication: Castellani A, Chalmers AJ. Manual of Tropical Medicine, 3rd ed. Williams Wood and Co., New York, 1919.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Synonyms:

  • Name	Kind
    Capsularis Prévot 1938 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Shah and Collins 1989 Shah HN, Collins MD. Proposal to restrict the genus Bacteroides (Castellani and Chalmers) to Bacteroides fragilis and closely related species. Int. J. Syst. Bacteriol. 1989; 39:85-87. 🇬🇧

• Notes:
  • 🥇 Nomenclatural type of the class Bacteroidia Krieg 2012. Publication: Krieg NR. Class I. Bacteroidia class. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 4, Springer, New York, 2010, p. 25. 🇺🇸
  • 🥇 Nomenclatural type of the family Bacteroidaceae Pribram 1933 (Approved Lists 1980). Publication: Pribram E. Klassification der Schizomyceten. F. Deuticke, Leipzig, 1933.
  • 🥇 Nomenclatural type of the order Bacteroidales Krieg 2012. Publication: Krieg NR. Order I. Bacteroidales ord. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 4, Springer, New York, 2010, p. 25. 🇺🇸
  • 🥇 Nomenclatural type of the phylum Bacteroidota Krieg et al. 2021. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🥇 Nomenclatural type of the tribe Bacteroideae Castellani and Chalmers 1919 (Approved Lists 1980). Publication: Castellani A, Chalmers AJ. Manual of tropical medicine, 3rd ed. Williams, Wood and Co., New York, 1919.
  • 🧕 Bergey et al. (1923) assigned this genus to the tribe Bacteroideae Castellani and Chalmers 1919 (Approved Lists 1980). Publication: Waksman SA. Genus III. Actinomyces Harz,. In: Bergey DH, Harrison FC, Breed RS, Hammer BW, Huntoon FM (eds), Bergey's Manual of Determinative Bacteriology, 1st ed., The Williams & Wilkins Co, Baltimore, 1923, p. 339-371.
  • 🧕 Breed et al. (1948) assigned this genus to the tribe Bacteroideae Castellani and Chalmers 1919 (Approved Lists 1980). Publication: Burkholder WH. Genus I. Pseudomonas Migula. Bacterial plant pathogens. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 82-150.
  • 🧕 Castellani and Chalmers (1919) assigned this genus to the tribe Bacteroideae Castellani and Chalmers 1919 (Approved Lists 1980). Publication: Castellani A, Chalmers AJ. Manual of tropical medicine, 3rd ed. Williams, Wood and Co., New York, 1919.
  • 🧕 Cavalier-Smith and Chao (2020) assigned this genus to the superclass "Bacteroidia" Cavalier-Smith 2020. Publication: Cavalier-Smith T, Chao EE. Multidomain ribosomal protein trees and the planctobacterial origin of neomura (eukaryotes, archaebacteria). Protoplasma 2020; 257:621-753. 🇬🇧
  • 🧕 Krieg et al. (2010) assigned this genus to the class Bacteroidia Krieg 2012. Publication: Krieg NR. Class I. Bacteroidia class. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 4, Springer, New York, 2010, p. 25. 🇺🇸
  • 🧕 Krieg et al. (2010) assigned this genus to the order Bacteroidales Krieg 2012. Publication: Krieg NR. Order I. Bacteroidales ord. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 4, Springer, New York, 2010, p. 25. 🇺🇸
  • 🧕 Oren and Garrity (2021) assigned this genus to the phylum Bacteroidota Krieg et al. 2021. Publication: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056. 🇮🇱
  • 🚋 The type species of this genus has alternatively been placed in the genus Bacillus Cohn 1872 (Approved Lists 1980). Publication: Veillon A, Zuber A. Recherches sur quelques microbes strictement anaérobies et leur rôle en pathologie. Archives de Mèdecine Expérimentale et d'Anatomie Pathologique 1898; 10:517-545.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Bacferoides"; "Bacicroidcs"; "Bacieroides"; "Bacleroides"; "Bacreroides"; "Bactcroidcs"; "Bactcroides"; "Bactemides"; "Bacteraides"; "Bacteriodes"; "Bacteroicles"; "Bacteroidcs"; "Bacteroidea"; "Bacteroidis"; "Bacteroidos"; "Bacteroidrs"; "Bacteroidus"; "Bacterordes"; "Bacterozdes"; "Bactevoides"; "Baczeroides"; "Baeteroidcs"; "Bucteroides"; "Hacteroides"; "Iiacteroides"; "Ilactcroides"; "Racteroides".
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Olsen I, Shah HN. International Committee on Systematics of Prokaryotes; Subcommittee on the taxonomy of Gram-negative anaerobic rods. Int J Syst Evol Microbiol 2008; 58:1051-1055. 🇬🇧
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Olsen I, Shah HN. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Gram-negative anaerobic rods. Int J Syst Evol Microbiol 2001; 51:1943-1944. 🇬🇧
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Olsen I, Shah HN. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Gram-negative anaerobic rods. Minutes of the meeting, 29 July 2002, Paris, France. Int. J. Syst. Evol. Microbiol. 2003; 53:923-924. 🇬🇧
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Olsen I, Shah HN. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Gram-negative anaerobic rods. Minutes of the meetings, 9 and 10 July 2000, Manchester, UK. Int. J. Syst. Evol. Microbiol. 2001; 51:1943-1944. 🇬🇧
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Anonymous NN. International Committee on Systematic Bacteriology Subcommittee on the Taxonomy of Flavobacterium and Cytophaga-Like Bacteria: Minutes of the Meetings, 4 and 6 July 1994, Prague, Czech Republic. International Journal of Systematic Bacteriology 1997; 47:593-594.
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Goldberg HS. International Committee on Systematic Bacteriology Subcommittee on the Taxonomy of Gram-Negative Anaerobic Rods: Minutes of the Meeting, 5 and 6 September 1986, Manchester, England. International Journal of Systematic Bacteriology 1988; 38:225-225.
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Goldberg HS. International Committee on Systematic Bacteriology Subcommittee on the Taxonomy of Gram-Negative Anaerobic Rods: Minutes of the Meeting, 5 and 6 September 1986, Manchester, England. Int. J. Syst. Evol. Microbiol. 1988; 38:225-225.
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Chassard et al. (2008), Bakir et al. (2006), Irisawa et al. (2016), Kitahara et al. (2012), Song et al. (2005). Editors in search of reviewers are advised to consider additional criteria such as whether a taxon is covered by one of the ICSP subcommittees.
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 115; JCM: 98; CCUG: 92; ATCC: 80; NCTC: 42; CIP: 39; LMG: 15; KCTC: 14; CSUR: 12; CGMCC: 10.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 2 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for France has been imported on 2024-08-30. The full classification is: risk group = 2. — The risk group for Taiwan has been imported on 2024-11-03. The full classification is: risk group = 1, note = "P650 = v". — The risk group for United Kingdom has been imported on 2024-01-31. The full classification is: risk group = 2. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🧍 Pittman et al. (1991) suggested the abbreviation "BTRD" for this genus name but this does not appear to be of practical relevance any longer. Publication: Pittman KF, Walczak CA, Lock CM. Codes and abbreviations for approved of effectively published names of genera of bacteria published from January 1980 to December 1990. Int J Syst Bacteriol 1991; 41:571-579.

Subdivision:

Number of child taxa with a validly published and correct name: 53
Number of child taxa with a validly published name, including synonyms: 113
Total number of child taxa: 170

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Bacteroides acidifaciens Miyamoto and Itoh 2000	validly published under the ICNP	correct name
    "Bacteroides aerofaciens" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides amylophilus Hamlin and Hungate 1956 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides asaccharolyticus (Holdeman and Moore 1970) Finegold and Barnes 1977 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Candidatus Bacteroides avicola" Gilroy et al. 2021	not validly published	pro-correct name
    "Bacteroides avidus" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides barnesiae Lan et al. 2006	validly published under the ICNP	synonym
    "Bacteroides biformis" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides bivius Holdeman and Johnson 1977 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides bouchesdurhonensis" Ndongo et al. 2019	not validly published	preferred name
    Bacteroides buccae Holdeman et al. 1982	validly published under the ICNP	synonym
    Bacteroides buccalis Shah and Collins 1982	validly published under the ICNP	synonym
    Bacteroides caccae Johnson et al. 1986	validly published under the ICNP	correct name
    Bacteroides caecicola Irisawa et al. 2016	validly published under the ICNP	correct name
    Bacteroides caecigallinarum Saputra et al. 2015	validly published under the ICNP	correct name
    Bacteroides caecimuris Lagkouvardos et al. 2016	validly published under the ICNP	correct name
    Bacteroides capillosus (Tissier 1908) Kelly 1957 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides capillus Kornman and Holt 1982	validly published under the ICNP	synonym
    "Bacteroides catenaformis" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides celer Yang et al. 2025	validly published under the ICNP	correct name
    Bacteroides cellulolyticus Hitch et al. 2022	validly published under the ICNP	correct name
    Bacteroides cellulosilyticus Robert et al. 2007	validly published under the ICNP	correct name
    Bacteroides cellulosolvens Murray et al. 1984	validly published under the ICNP	synonym
    Bacteroides chinchillae Kitahara et al. 2011	validly published under the ICNP	synonym
    Bacteroides clarus Watanabe et al. 2010	validly published under the ICNP	correct name
    "Bacteroides clostridiiformis" (Burri and Ankersmit 1906) Holdeman and Moore 1970	not validly published	synonym
    Bacteroides coagulans Eggerth and Gagnon 1933 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides congonensis" Andrieu et al. 2018	not validly published	preferred name
    Bacteroides coprocola Kitahara et al. 2005	validly published under the ICNP	synonym
    Bacteroides coprophilus Hayashi et al. 2007	validly published under the ICNP	synonym
    Bacteroides coprosuis Whitehead et al. 2005	validly published under the ICNP	correct name
    Bacteroides corporis Johnson and Holdeman 1983	validly published under the ICNP	synonym
    "Bacteroides corrodens" Eiken 1958	not validly published, basonym of name in Approved Lists	synonym
    "Bacteroides cutis" Belkacemi et al. 2018	not validly published	preferred name
    "Bacteroides cylindroides" (Rocchi 1908) Kelly 1957	not validly published	synonym
    "Bacteroides denticanum" Kitahara et al. 2005	not validly published	preferred name
    Bacteroides denticola Shah and Collins 1982	validly published under the ICNP	synonym
    "Bacteroides destillationis" (Weinberg et al. 1937) Kelly 1957	not validly published	preferred name
    "Bacteroides difficilis" Liu et al. 2021	not validly published	preferred name
    Bacteroides disiens Holdeman and Johnson 1977 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides distasonis Eggerth and Gagnon 1933 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides dorei Bakir et al. 2006	validly published under the ICNP	synonym
    Bacteroides eggerthii Holdeman and Moore 1974 (Approved Lists 1980)	validly published under the ICNP	correct name
    Bacteroides endodontalis van Steenbergen et al. 1984	validly published under the ICNP	synonym
    Bacteroides facilis Liu et al. 2022	validly published under the ICNP	correct name
    Bacteroides faecalis Yu et al. 2019	validly published under the ICNP	correct name
    Bacteroides faecichinchillae Kitahara et al. 2012	validly published under the ICNP	correct name
    Bacteroides faecis Kim et al. 2010	validly published under the ICNP	correct name
    Bacteroides faecium Kim et al. 2023	validly published under the ICNP	correct name
    Bacteroides finegoldii Bakir et al. 2006	validly published under the ICNP	correct name
    "Bacteroides floccosus" Hauduroy et al. 1953	not validly published	preferred name
    Bacteroides fluxus Watanabe et al. 2010	validly published under the ICNP	correct name
    Bacteroides forsythus Tanner et al. 1986	validly published under the ICNP	synonym
    Bacteroides fragilis (Veillon and Zuber 1898) Castellani and Chalmers 1919 (Approved Lists 1980)	validly published under the ICNP	correct name
    Bacteroides furcosus (Veillon and Zuber 1898) Hauduroy et al. 1937 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides fusiformis" (Veillon and Zuber 1898) Castellani and Chalmers 1919	not validly published	preferred name
    Bacteroides galacturonicus Jensen and Canale-Parola 1987	validly published under the ICNP	correct name
    Bacteroides gallinaceum Irisawa et al. 2016	inaccurate spelling	misspelling
    Bacteroides gallinaceus corrig. Irisawa et al. 2016	validly published under the ICNP	correct name
    Bacteroides gallinarum Lan et al. 2006	validly published under the ICNP	correct name
    Bacteroides gingivalis Coykendall et al. 1980	validly published under the ICNP	synonym
    "Bacteroides glutinosus" Hauduroy et al. 1953	not validly published	preferred name
    Bacteroides goldsteinii Song et al. 2006	validly published under the ICNP	synonym
    Bacteroides gracilis Tanner et al. 1981	validly published under the ICNP	synonym
    Bacteroides graminisolvens Nishiyama et al. 2009	validly published under the ICNP	correct name
    Bacteroides helcogenes Benno et al. 1983	validly published under the ICNP	correct name
    Bacteroides heparinolyticus Okuda et al. 1985	validly published under the ICNP	synonym
    Bacteroides hominis Liu et al. 2022	validly published under the ICNP	synonym
    "Bacteroides hominis" Afrizal et al. 2022	not validly published	synonym
    Bacteroides humanifaecis Kim et al. 2023	validly published under the ICNP	correct name
    Bacteroides hypermegas Harrison and Hansen 1963 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides ihuae" Fonkou et al. 2017	not validly published	synonym
    "Bacteroides ihuae" Andrieu et al. 2018	not validly published	preferred name
    "Bacteroides ilei" Andrieu et al. 2018	not validly published	preferred name
    Bacteroides intermedius (Holdeman and Moore 1970) Johnson and Holdeman 1983	validly published under the ICNP	synonym
    Bacteroides intestinalis Bakir et al. 2006	validly published under the ICNP	correct name
    "Candidatus Bacteroides intestinavium" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Bacteroides intestinigallinarum" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Bacteroides intestinipullorum" Gilroy et al. 2021	not validly published	pro-correct name
    Bacteroides koreensis Shin et al. 2017	validly published under the ICNP	correct name
    Bacteroides kribbi Shin et al. 2017	validly published under the ICNP	correct name
    "Bacteroides lentus" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides levii (ex Holdeman et al. 1977) Johnson and Holdeman 1983	validly published under the ICNP	synonym
    "Bacteroides limosus" Eggerth 1935	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides loescheii Holdeman and Johnson 1982	validly published under the ICNP	synonym
    Bacteroides luhongzhouii Ge et al. 2021	validly published under the ICNP	correct name
    Bacteroides luti Hatamoto et al. 2014	validly published under the ICNP	correct name
    Bacteroides macacae (Slots and Genco 1980) Coykendall et al. 1980	validly published under the ICNP	synonym
    "Candidatus Bacteroides massiliae" Drancourt et al. 2004	inaccurate spelling	misspelling
    "Candidatus Bacteroides massiliensis" corrig. Drancourt et al. 2004	not validly published	synonym
    Bacteroides massiliensis Fenner et al. 2005	validly published under the ICNP	synonym
    "Bacteroides maternus" da Silva Morais et al. 2025	not validly published	preferred name
    "Bacteroides mediterraneensis" Mailhe et al. 2016	not validly published	synonym
    "Bacteroides mediterraneensis" Andrieu et al. 2018	not validly published	preferred name
    Bacteroides melaninogenicus (Oliver and Wherry 1921) Roy and Kelly 1939 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides merdae Johnson et al. 1986	validly published under the ICNP	synonym
    "Candidatus Bacteroides merdavium" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Bacteroides merdigallinarum" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Bacteroides merdipullorum" Gilroy et al. 2021	not validly published	pro-correct name
    Bacteroides microfusus Kaneuchi and Mitsuoka 1978 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides minutum" Hauduroy et al. 1937	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides mucinivorans Yang et al. 2025	validly published under the ICNP	correct name
    Bacteroides multiacidus Mitsuoka et al. 1974 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides multiformis" Liu et al. 2021	not validly published	preferred name
    "Bacteroides muris" Afrizal et al. 2022	not validly published	synonym
    Bacteroides muris Fokt et al. 2023	validly published under the ICNP	correct name
    "Bacteroides ndongoniae" Andrieu et al. 2018	not validly published	preferred name
    "Bacteroides neonati" Cassir et al. 2014	not validly published	preferred name
    Bacteroides nodosus (Beveridge 1941) Mraz 1963 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides nordii Song et al. 2005	validly published under the ICNP	correct name
    Bacteroides ochraceus (Prévot et al. 1956) Holdeman and Moore 1972 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides oleiciplenus Watanabe et al. 2010	validly published under the ICNP	correct name
    Bacteroides oralis Loesche et al. 1964 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides oris Holdeman et al. 1982	validly published under the ICNP	synonym
    Bacteroides oulorum Shah et al. 1985	validly published under the ICNP	synonym
    Bacteroides ovatus Eggerth and Gagnon 1933 (Approved Lists 1980)	validly published under the ICNP	correct name
    Bacteroides parvus Liu et al. 2022	validly published under the ICNP	correct name
    Bacteroides paurosaccharolyticus Ueki et al. 2011	validly published under the ICNP	synonym
    Bacteroides pectinophilus Jensen and Canale-Parola 1987	validly published under the ICNP	correct name
    Bacteroides pentosaceus Shah and Collins 1982	validly published under the ICNP	synonym
    "Candidatus Bacteroides periocalifornicus" McLean et al. 2015	inaccurate spelling	misspelling
    "Candidatus Bacteroides periodontitidicalifornicus" corrig. McLean et al. 2015	not validly published	pro-correct name
    Bacteroides plebeius Kitahara et al. 2005	validly published under the ICNP	synonym
    Bacteroides pneumosintes (Olitsky and Gates 1921) Holdeman and Moore 1970 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides polypragmatus Patel and Breuil 1982	validly published under the ICNP	correct name
    Bacteroides praeacutus (Tissier 1908) Holdeman and Moore 1970 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides praussnitzii" Hauduroy et al. 1937	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides propionicifaciens Ueki et al. 2008	validly published under the ICNP	correct name
    Bacteroides propionicigenes Sun et al. 2022	validly published under the ICNP	correct name
    "Candidatus Bacteroides pullicola" Gilroy et al. 2021	not validly published	pro-correct name
    Bacteroides putredinis (Weinberg et al. 1937) Kelly 1957 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides pyogenes Benno et al. 1983	validly published under the ICNP	correct name
    "Bacteroides rectalis" Hauduroy et al. 1937	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides reticulotermitis Sakamoto and Ohkuma 2013	validly published under the ICNP	correct name
    Bacteroides rhinocerotis Li et al. 2024	validly published under the ICNP	correct name
    Bacteroides rodentium Kitahara et al. 2011	validly published under the ICNP	correct name
    Bacteroides ruminicola Bryant et al. 1958 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides russii" Hauduroy et al. 1937	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides salanitronis Lan et al. 2006	validly published under the ICNP	synonym
    Bacteroides salivosus Love et al. 1987	validly published under the ICNP	synonym
    Bacteroides salyersae Song et al. 2005	inaccurate spelling	misspelling
    Bacteroides salyersiae corrig. Song et al. 2005	validly published under the ICNP	correct name
    Bacteroides sartorii Clavel et al. 2010	validly published under the ICNP	synonym
    "Bacteroides sedimenti" Ismaeil et al. 2018	not validly published	preferred name
    Bacteroides splanchnicus Werner et al. 1975 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides stercorirosoris Kitahara et al. 2012	validly published under the ICNP	correct name
    Bacteroides stercoris Johnson et al. 1986	validly published under the ICNP	correct name
    Bacteroides succinogenes Hungate 1950 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides suis Benno et al. 1983	validly published under the ICNP	synonym
    "Bacteroides symbiosus" Stevens 1956	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides tectum Love et al. 1986	inaccurate spelling	misspelling
    Bacteroides tectus corrig. Love et al. 1986	validly published under the ICNP	synonym
    "Bacteroides tenuis" Bergey et al. 1923	not validly published, basonym of name in Approved Lists	synonym
    "Bacteroides terebrans" (Brocard and Pham 1934) Kelly 1957	not validly published	preferred name
    Bacteroides termitidis (Sebald 1962) Holdeman and Moore 1970 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides thetaiotaomicron (Distaso 1912) Castellani and Chalmers 1919 (Approved Lists 1980)	validly published under the ICNP	correct name
    "Candidatus Bacteroides timonensis" Pfleiderer et al. 2013	not validly published	pro-correct name
    "Bacteroides timonensis" Ramasamy et al. 2014	not validly published	preferred name
    "Bacteroides togonis" Andrieu et al. 2018	not validly published	preferred name
    Bacteroides uniformis Eggerth and Gagnon 1933 (Approved Lists 1980)	validly published under the ICNP	correct name
    Bacteroides ureolyticus Jackson and Goodman 1978 (Approved Lists 1980)	validly published under the ICNP	synonym
    "Bacteroides varius" Eggerth and Gagnon 1933	not validly published, basonym of name in Approved Lists	synonym
    Bacteroides veroralis Watabe et al. 1983	validly published under the ICNP	synonym
    Bacteroides vicugnae Miller et al. 2025	validly published under the ICNP	correct name
    "Bacteroides viscosus" Hauduroy et al. 1953	not validly published	preferred name
    Bacteroides vulgatus Eggerth and Gagnon 1933 (Approved Lists 1980)	validly published under the ICNP	synonym
    Bacteroides xylanisolvens Chassard et al. 2008	validly published under the ICNP	correct name
    Bacteroides xylanolyticus Scholten-Koerselman et al. 1988	validly published under the ICNP	synonym
    Bacteroides zhangwenhongii Ge et al. 2021	validly published under the ICNP	correct name
    Bacteroides zoogleoformans (Weinberg et al. 1937) Cato et al. 1982	validly published under the ICNP	correct name

Parent taxon: Bacteroidaceae Pribram 1933 (Approved Lists 1980)

Assigned by: Parker CD. Genus V. Thiobacillus Beijerinck 1904. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co, Baltimore, 1957, p. 83-88.

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Record number: 517409