Name: Slackia piriformis Nagai et al. 2010

Category: Species

Proposed as: sp. nov.

Etymology: pi.ri.for’mis. L. neut. n. pirum, pear; L. masc./fem. adj. suff. -formis, -like, in the shape of; N.L. fem. adj. piriformis, pear-shaped, referring to the cell shape

Pronunciation, gender: … pi-ri-FOR-mis, feminine

Type strain: DSM 22477; JCM 16070; YIT 12062

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB601000 Analyse FASTA

Valid publication: Nagai F, Watanabe Y, Morotomi M. Slackia piriformis sp. nov. and Collinsella tanakaei sp. nov., new members of the family Coriobacteriaceae, isolated from human faeces. Int J Syst Evol Microbiol 2010; 60:2639-2646. 🇯🇵

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 60, part 11 of the IJSEM. Int J Syst Evol Microbiol 2011; 61:221-222.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Notes:
  • 😷 The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 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.
  • 🎓 Name mentioned 3 times in PubMed until 2025-06-04.
  • 🙆 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 other species in the genus.
  • 🧍 The phylogenetic position of this species was determined in a genome-scale analysis by Nouioui et al. (2018). Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪

Parent taxon: Slackia Wade et al. 1999

Assigned by: Nagai F, Watanabe Y, Morotomi M. Slackia piriformis sp. nov. and Collinsella tanakaei sp. nov., new members of the family Coriobacteriaceae, isolated from human faeces. Int J Syst Evol Microbiol 2010; 60:2639-2646. 🇯🇵

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Record number: 788870