Name: Olsenella Dewhirst et al. 2001

Category: Genus

Proposed as: gen. nov.

Etymology: Ol.sen.el’la. L. fem. dim. n. suff. -ella, diminutive ending; N.L. fem. dim. n. Olsenella, of Olsen, named to honour Ingar Olsen, a contemporary Norwegian microbiologist, who first described Lactobacillus uli

Gender: feminine (stem: Olsenell-)

Type species: Olsenella uli (Olsen et al. 1991) Dewhirst et al. 2001

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Valid publication: Dewhirst FE, Paster BJ, Tzellas N, Coleman B, Downes J, Spratt DA, Wade WG. Characterization of novel human oral isolates and cloned 16S rDNA sequences that fall in the family Coriobacteriaceae: description of olsenella gen. nov., reclassification of Lactobacillus uli as Olsenella uli comb. nov. and description of Olsenella profusa sp. nov. Int J Syst Evol Microbiol 2001; 51:1797-1804.

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 51, part 5 of the IJSEM. Int J Syst Evol Microbiol 2001; 51:1947-1948.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Parafannyhessea Zgheib et al. 2021	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Kraatz et al. 2011 Kraatz M, Wallace RJ, Svensson L. Olsenella umbonata sp. nov., a microaerotolerant anaerobic lactic acid bacterium from the sheep rumen and pig jejunum, and emended descriptions of Olsenella, Olsenella uli and Olsenella profusa. Int J Syst Evol Microbiol 2011; 61:795-803. Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 61, part 4 of the IJSEM. Int J Syst Evol Microbiol 2011; 61:1502-1503.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 1 new species in the genus.
  • Paek et al. 2024 Paek J, Bai L, Shin Y, Kim H, Kim SH, Shin JH, Kook JK, Chang YH. Description of Olsenella absiana sp. nov., an anaerobic bacterium isolated from pig faeces. Int J Syst Evol Microbiol 2024; 74:6579. Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 74, part 11 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6619.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 1 new species in the genus.
    • 😢 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.

• Notes:
  • 🧕 Zhi et al. (2009) assigned this genus to the family Coriobacteriaceae Stackebrandt et al. 1997. Publication: Zhi XY, Li WJ, Stackebrandt E. An update of the structure and 16S rRNA gene sequence-based definition of higher ranks of the class Actinobacteria, with the proposal of two new suborders and four new families and emended descriptions of the existing higher taxa. Int J Syst Evol Microbiol 2009; 59:589-608.
  • 🚋 The type species of this genus has alternatively been placed in the genus Lactobacillus Beijerinck 1901 (Approved Lists 1980). Publication: Olsen I, Johnson JL, Moore LV, Moore WE. Lactobacillus uli sp. nov. and Lactobacillus rimae sp. nov. from the human gingival crevice and emended descriptions of lactobacillus minutus and Streptococcus parvulus. Int J Syst Bacteriol 1991; 41:261-266.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Olsenalla"; "Olsenlla".
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Klein G. International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Bifidobacterium, Lactobacillus and Related Organisms. Minutes of the meetings, 1 and 2 April 2005, Stuttgart-Hohenheim, Germany. Int. J. Syst. Evol. Microbiol. 2006; 56:2501-2503.
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Bai et al. (2025). 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 phylogenomic assignment score of this taxon is 0.06033 (N = 2).
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 12; CSUR: 8; JCM: 6; CCUG: 5; KCTC: 4; NBRC: 2; GDMCC: 1; CCOS: 1; CECT: 1; LMG: 1.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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.

Subdivision:

Number of child taxa with a validly published and correct name: 10
Number of child taxa with a validly published name, including synonyms: 13
Total number of child taxa: 26

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Olsenella absiana Paek et al. 2024	validly published under the ICNP	correct name
    "Candidatus Olsenella avicola" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Olsenella avistercoris" Gilroy et al. 2021	not validly published	pro-correct name
    "Olsenella congonensis" Bilen et al. 2017	not validly published	preferred name
    "Candidatus Olsenella excrementavium" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Olsenella excrementigallinarum" Gilroy et al. 2021	not validly published	pro-correct name
    Olsenella faecalis Han et al. 2019	validly published under the ICNP	synonym
    Olsenella gallinarum Zenner et al. 2021	validly published under the ICNP	synonym
    Olsenella intestinalis Guan et al. 2023	validly published under the ICNP	correct name
    Olsenella kribbiana Bai et al. 2025	validly published under the ICNP	correct name
    "Olsenella lakotia" Wongkuna et al. 2020	not validly published	preferred name
    Olsenella massiliensis Zgheib et al. 2021	validly published under the ICNP	correct name
    "Olsenella mediterranea" Ricaboni et al. 2017	not validly published	synonym
    Olsenella phocaeensis Zgheib et al. 2021	validly published under the ICNP	correct name
    "Olsenella phocaeensis" Ricaboni et al. 2017	not validly published	synonym
    Olsenella porci Wylensek et al. 2021	validly published under the ICNP	correct name
    Olsenella profusa Dewhirst et al. 2001	validly published under the ICNP	correct name
    "Olsenella provencensis" Ricaboni et al. 2017	not validly published	synonym
    "Candidatus Olsenella pullicola" Gilroy et al. 2021	not validly published	pro-correct name
    "Candidatus Olsenella pullistercoris" Gilroy et al. 2021	not validly published	pro-correct name
    Olsenella scatoligenes Li et al. 2015	validly published under the ICNP	synonym
    "Candidatus Olsenella stercoravium" Gilroy et al. 2021	not validly published	pro-correct name
    "Olsenella timonensis" Ndongo et al. 2019	not validly published	preferred name
    Olsenella uli (Olsen et al. 1991) Dewhirst et al. 2001	validly published under the ICNP	correct name
    Olsenella umbonata Kraatz et al. 2011	validly published under the ICNP	correct name
    Olsenella urininfantis Zgheib et al. 2021	validly published under the ICNP	correct name

Parent taxon: Atopobiaceae Gupta et al. 2013

Assigned by: Zgheib R, Anani H, Meng MM, Mailhe M, Ricaboni D, Morand A, Caputo A, Traore SI, Fontanini A, Armstrong N, et al. New human-associated species of the family Atopobiaceae and proposal to reclassify members of the genus Olsenella. Int J Syst Evol Microbiol 2021; 71:4819.

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Record number: 516216