Name: "Caecibacter massiliensis" Ricaboni et al. 2017

Category: Species

Proposed as: sp. nov.

Etymology: mas.si.li.en’sis. L. masc. adj. massiliensis, from Massilia, the Roman name of Marseille

Pronunciation (Latin), gender: … mas-si-li-EN-sis, masculine

Nomenclatural type: CSUR P2974; Marseille P2974

Conduct genome-based taxonomy at

16S rRNA gene: LT576402 Analyse FASTA

Original publication: Ricaboni D, Mailhe M, Benezech A, Cadoret F, Fournier PE, Raoult D. 'Caecibactermassiliensis' gen. nov., sp. nov., isolated from human right colon. New Microbes New Infect 2017; 17:30-32. 🇫🇷

Nomenclatural status: not validly published

Taxonomic status: synonym (and no standing)

Correct name: Megasphaera hexanoica Jeon et al. 2017

• Synonyms:

  • Name	Kind
    Megasphaera hexanoica Jeon et al. 2017	heterotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus "Caecibacter" Ricaboni et al. 2017. Publication: Ricaboni D, Mailhe M, Benezech A, Cadoret F, Fournier PE, Raoult D. 'Caecibactermassiliensis' gen. nov., sp. nov., isolated from human right colon. New Microbes New Infect 2017; 17:30-32. 🇫🇷
  • ⏲ According to Heng et al. (2025), this species is a later heterotypic synonym of Megasphaera hexanoica Jeon et al. 2017. Publication: Heng YC, Lee JKY, Silvaraju S, Kittelmann S. Description of Megasphaera jansseni sp. nov., a novel short- and medium-chain fatty acid-producing species isolated from faeces of a wild boar (Sus scrofa), and a taxonomic note on the family Veillonellaceae. Int J Syst Evol Microbiol 2025; 75:6937. 🇸🇬

Parent taxon: "Caecibacter" Ricaboni et al. 2017

Assigned by: Ricaboni D, Mailhe M, Benezech A, Cadoret F, Fournier PE, Raoult D. 'Caecibactermassiliensis' gen. nov., sp. nov., isolated from human right colon. New Microbes New Infect 2017; 17:30-32. 🇫🇷

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Record number: 14051