Name: Eggerthia catenaformis (Eggerth 1935) Salvetti et al. 2011

Category: Species

Proposed as: comb. nov.

Basonym: "Bacteroides catenaformis" Eggerth 1935

Etymology: ca.te.na.for’mis. L. fem. n. catena, chain; L. masc./fem. adj. suff. -formis, -like, in the shape of; from L. fem. n. forma, figure, shape, appearance; N.L. fem. adj. catenaformis, chain-shaped [probably better: cateniformis]

Pronunciation (Latin), gender: eg-GER-t^hi-a ka-te-na-FOR-mis, feminine

Type strain: ATCC 25536; CCUG 48174; CIP 104817; DSM 20559; JCM 1121

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ621549 Analyse FASTA

Valid publication: Salvetti E, Felis GE, Dellaglio F, Castioni A, Torriani S, Lawson PA. Reclassification of Lactobacillus catenaformis (Eggerth 1935) Moore and Holdeman 1970 and Lactobacillus vitulinus Sharpe et al. 1973 as Eggerthia catenaformis gen. nov., comb. nov. and Kandleria vitulina gen. nov., comb. nov., respectively. Int J Syst Evol Microbiol 2011; 61:2520-2524. 🇮🇹

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 61, part 10 of the IJSEM. Int J Syst Evol Microbiol 2012; 62:5-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 1

• Synonyms:

  • Name	Kind
    "Catenabacterium catenaforme" (Eggerth 1935) Prévot 1938	homotypic synonym, not validly published
    Lactobacillus catenaforme (Eggerth 1935) Moore and Holdeman 1970 (Approved Lists 1980)	homotypic synonym, inaccurate spelling
    Lactobacillus catenaformis corrig. (Eggerth 1935) Moore and Holdeman 1970 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    "Bacteroides catenaformis" Eggerth 1935	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 🥇 Nomenclatural type of the genus Eggerthia Salvetti et al. 2011. Publication: Salvetti E, Felis GE, Dellaglio F, Castioni A, Torriani S, Lawson PA. Reclassification of Lactobacillus catenaformis (Eggerth 1935) Moore and Holdeman 1970 and Lactobacillus vitulinus Sharpe et al. 1973 as Eggerthia catenaformis gen. nov., comb. nov. and Kandleria vitulina gen. nov., comb. nov., respectively. Int J Syst Evol Microbiol 2011; 61:2520-2524. 🇮🇹
  • 😢 The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. Contrasting the term "chemotaxonomic" with "phenotypic" is not recommended. Using the term "phylogenetic data" (or equivalent) for sequence data is not advocated. See the LPSN phylogeny page for details. Publication: Göker M. What can genome analysis offer for bacteria? In: Bridge P, Smith D, Stackebrandt E (eds), Trends in the systematics of bacteria and fungi, CAB International, Wallingford, 2021, p. 255-281. 🇬🇧
  • 😷 The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1, note = "+". — 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.
  • 🎓 Name mentioned 23 times in PubMed until 2026-06-11.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.
  • 🧍 According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0. 🇬🇧
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683. 🇺🇸

Parent taxon: Eggerthia Salvetti et al. 2011

Assigned by: Salvetti E, Felis GE, Dellaglio F, Castioni A, Torriani S, Lawson PA. Reclassification of Lactobacillus catenaformis (Eggerth 1935) Moore and Holdeman 1970 and Lactobacillus vitulinus Sharpe et al. 1973 as Eggerthia catenaformis gen. nov., comb. nov. and Kandleria vitulina gen. nov., comb. nov., respectively. Int J Syst Evol Microbiol 2011; 61:2520-2524. 🇮🇹

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Record number: 789495