Name: Methanimicrococcus hacksteinii Protasov and Brune 2025

Category: Species

Proposed as: sp. nov.

Etymology: hack.stei’ni.i. N.L. gen. masc. n. hacksteinii, named after Johannes H.P. Hackstein in recognition of his important contributions to arthropod gut microbiology

Pronunciation, gender: hakk-STE͡I-ni-i, masculine

Type strain: At1; DSM 115570; JCM 39383

Conduct genome-based taxonomy at

16S rRNA gene: OQ442333 Analyse FASTA

Effective publication: Protasov E, Reeh H, Liu P, Poehlein A, Platt K, Heimerl T, Herve V, Daniel R, Brune A. Genome reduction in novel, obligately methyl-reducing Methanosarcinales isolated from arthropod guts (Methanolapillus gen. nov. and Methanimicrococcus). FEMS Microbiol Ecol 2024; 100:0.

IJSEM list: Oren A, Göker M. Validation list no. 223. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2025; 75:6699.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    "Methanimicrococcus hacksteinii" Protasov and Brune 2023	homotypic synonym, not validly published

• Notes:
  • ✏ The authority of the taxon name (Protasov and Brune) deliberately differs from the authors of the publication (Protasov et al.).
  • 🎓 Name mentioned 0 times in PubMed until 2025-06-03.

Parent taxon: Methanimicrococcus corrig. Sprenger et al. 2000

Assigned by: Protasov E, Reeh H, Liu P, Poehlein A, Platt K, Heimerl T, Herve V, Daniel R, Brune A. Genome reduction in novel, obligately methyl-reducing Methanosarcinales isolated from arthropod guts (Methanolapillus gen. nov. and Methanimicrococcus). FEMS Microbiol Ecol 2024; 100:0.

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Record number: 65805