Name: "Candidatus Paceibacteria" Chuvochina et al. 2023

Category: Class

Proposed as: Candidatus

Etymology: Pa.ce.i.bac.te’ri.a. N.L. masc. n. Paceibacter, a Candidatus genus name; L. neut. pl. n. suff. -ia, ending to denote a class; N.L. neut. pl. n. Paceibacteria, the class of the order Paceibacterales

Pronunciation, gender: pa-ke-i-bak-TE-ri-a, neuter

Type order: "Candidatus Paceibacterales" Chuvochina et al. 2023

Original publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.

Nomenclatural status: not validly published

Nomenclatural pro-status: not pro-validly published

Taxonomic status: preferred name (not pro-correct name)

• Notes:
  • 🧕 Chuvochina et al. (2023) assigned this class to the phylum "Candidatus Patescibacteria" Parks et al. 2018. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Ryanbacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Moranbacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Sungbacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Terrybacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Spechtbacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Portnoybacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Chuvochina et al. (2023) assigned the order "Candidatus Paceibacterales" Chuvochina et al. 2023 to this class. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0.
  • 🧒 Jonas et al. (2025) assigned the order "Candidatus Phycocordibacterales" Jonas et al. 2025 to this class. Publication: Jonas L, Lee Y-Y, Bachvaroff T, Hill RT, Li Y. Two novel Patescibacteria: Phycocordibacter aenigmaticus gen. nov. sp. nov. and Minusculum obligatum gen. nov. sp. nov., both associated with microalgae optimized for carbon dioxide sequestration from flue gas. mBio 2025; 16:e0123125.
  • 🧒 Kuroda et al. (2024) assigned the family "Candidatus Yanofskyibacteriaceae" Kuroda et al. 2024 to this class. Publication: Kuroda K, Nakajima M, Nakai R, Hirakata Y, Kagemasa S, Kubota K, Noguchi TQP, Yamamoto K, Satoh H, Nobu MK, et al. Microscopic and metatranscriptomic analyses revealed unique cross-domain parasitism between phylum Candidatus Patescibacteria/candidate phyla radiation and methanogenic archaea in anaerobic ecosystems. mBio 2024; 15:e0310223.
  • 🧒 Kuroda et al. (2024) assigned the family "Candidatus Minisyncoccaceae" Kuroda et al. 2024 to this class. Publication: Kuroda K, Nakajima M, Nakai R, Hirakata Y, Kagemasa S, Kubota K, Noguchi TQP, Yamamoto K, Satoh H, Nobu MK, et al. Microscopic and metatranscriptomic analyses revealed unique cross-domain parasitism between phylum Candidatus Patescibacteria/candidate phyla radiation and methanogenic archaea in anaerobic ecosystems. mBio 2024; 15:e0310223.
  • 🛺 The type order of this class has been placed in the class Minisyncoccia Nakajima et al. 2025. Publication: Nakajima M, Nakai R, Hirakata Y, Kubota K, Satoh H, Nobu MK, Narihiro T, Kuroda K. Minisyncoccus archaeiphilus gen. nov., sp. nov., a mesophilic, obligate parasitic bacterium and proposal of Minisyncoccaceae fam. nov., Minisyncoccales ord. nov., Minisyncoccia class. nov. and Minisyncoccota phyl. nov. formerly referred to as Candidatus Patescibacteria or candidate phyla radiation. Int J Syst Evol Microbiol 2025; 75:6668.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Paciebacteria".
  • 🧍 The article mentions the SeqCode. This SeqCode is not an officially recognized code of nomenclature. In fact, the use of the SeqCode is officially discouraged. ICNP-compliant databases and publications are not allowed to use the SeqCode. The SeqCode deliberately and systematically violates the ICNP. The SeqCode attempts to undermine the scientific standard called "valid publication of the name of a prokaryote" by lowering the requirements compared to the ICNP, but using the same term and assigning it to names whose formation is indistinguishable from the one used by the ICNP. LPSN follows the ICNP and treats such names as not validly published. Publication: Goker M, Moore ERB, Oren A, Trujillo ME. Status of the SeqCode in the International Journal of Systematic and Evolutionary Microbiology. Int J Syst Evol Microbiol 2022; 72:5754.

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Record number: 42226