Species ***Prevotella* *nigrescens***

Name: Prevotella nigrescens Shah and Gharbia 1992

Category: Species

Proposed as: sp. nov.

Etymology: ni.gres’cens. L. fem. part. adj. nigrescens, becoming black, growing dark, referring to the characteristic black colonies formed on blood agar plates

Pronunciation (Latin), gender: pre-wo-TEL-la ni-GRES-kens, feminine

Type strain: ATCC 33563; CCUG 9560; CIP 105552; DSM 13386; JCM 12250; JCM 6322; Lambe 729-74; VPI 8944

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB547697 Analyse FASTA

Valid publication: Shah HN, Gharbia SE. Biochemical and chemical studies on strains designated Prevotella intermedia and proposal of a new pigmented species, Prevotella nigrescens sp. nov. Int J Syst Bacteriol 1992; 42:542-546. 🇬🇧

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 42, part 4 of the IJSB. Int J Syst Bacteriol 1993; 43:189.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

Synonyms:

Name	Kind
"Prevotella nigrescens" Shah and Gharbia 1993	homotypic synonym, not validly published

Emendations:
- Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.

Notes:
- 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2. — The risk group for Germany has been imported on 2026-08-13. 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.
- 🎓 Name mentioned 459 times in PubMed until 2026-06-11.
- 🪓 Organisms assigned to this species have previously been classified as Prevotella intermedia (Holdeman and Moore 1970) Shah and Collins 1990. Publication: Shah HN, Collins DM. Prevotella, a new genus to include Bacteroides melaninogenicus and related species formerly classified in the genus Bacteroides. Int J Syst Bacteriol 1990; 40:205-208. 🇬🇧
- 🙆 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. 🇬🇧

Parent taxon: Prevotella Shah and Collins 1990

Assigned by: Shah HN, Gharbia SE. Biochemical and chemical studies on strains designated Prevotella intermedia and proposal of a new pigmented species, Prevotella nigrescens sp. nov. Int J Syst Bacteriol 1992; 42:542-546. 🇬🇧

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.779796Link copied to clipboard

Record number: 779796

This LPSN page was printed on 2026-09-17 01:42:24

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Species Prevotella nigrescens

Species ***Prevotella* *nigrescens***