Name: Alkalihalobacillus macyae (Santini et al. 2004) Patel and Gupta 2020

Category: Species

Proposed as: comb. nov.

Basonym: Bacillus macyae Santini et al. 2004

Etymology: ma’cy.ae. N.L. gen. fem. n. macyae, of Macy, named after the late Professor Joan M. Macy, Chair of Microbiology, La Trobe University, in tribute to her research in the area of environmental microbiology

Pronunciation (Latin), gender: al-ka-li-ha-lo-ba-KIL-lus MA-ky-a͡e, masculine

Type strain: DSM 16346; JCM 12340; JMM-4

See detailed strain information at

16S rRNA gene: AY032601 Analyse FASTA

Valid publication: Patel S, Gupta RS. A phylogenomic and comparative genomic framework for resolving the polyphyly of the genus Bacillus: Proposal for six new genera of Bacillus species, Peribacillus gen. nov., Cytobacillus gen. nov., Mesobacillus gen. nov., Neobacillus gen. nov., Metabacillus gen. nov. and Alkalihalobacillus gen. nov. Int J Syst Evol Microbiol 2020; 70:406-438. 🇨🇦

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 70, part 1 of the IJSEM. Int J Syst Evol Microbiol 2020; 70:2167-2173.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Pseudalkalibacillus hwajinpoensis (Yoon et al. 2004) Joshi et al. 2022

Risk group: 1

• Synonyms:

  • Name	Kind
    "Anaerobacillus macyae" (Santini et al. 2004) Zavarzina et al. 2009	homotypic synonym, not validly published
    Alkalihalobacillus hwajinpoensis (Yoon et al. 2004) Patel and Gupta 2020	heterotypic synonym, validly published under the ICNP
    Bacillus macyae Santini et al. 2004	homotypic synonym, validly published under the ICNP
    Bacillus hwajinpoensis Yoon et al. 2004	heterotypic synonym, validly published under the ICNP
    Guptibacillus hwajinpoensis (Yoon et al. 2004) Bello et al. 2025	heterotypic synonym, validly published under the ICNP
    Pseudalkalibacillus hwajinpoensis (Yoon et al. 2004) Joshi et al. 2022	heterotypic synonym, validly published under the ICNP
    "Pseudalkalibacillus macyae" (Santini et al. 2004) Joshi et al. 2021	homotypic synonym, not validly published

• Notes:
  • ⏲ According to Bello et al. (2025), this species is a later heterotypic synonym of Alkalihalobacillus hwajinpoensis (Yoon et al. 2004) Patel and Gupta 2020. Publication: Bello S, Rudra B, Schellhorn HE. Phylogenomic studies and molecular markers clarifying the evolutionary relationships and classification of Pseudalkalibacillus species: proposal for the family Guptibacillaceae fam. nov. harbouring the genera Guptibacillus gen. nov. and Exobacillus gen. nov. Int J Syst Evol Microbiol 2025; 75:6757. 🇨🇦
  • ⏲ According to Bello et al. (2025), this species is a later heterotypic synonym of Bacillus hwajinpoensis Yoon et al. 2004. Publication: Bello S, Rudra B, Schellhorn HE. Phylogenomic studies and molecular markers clarifying the evolutionary relationships and classification of Pseudalkalibacillus species: proposal for the family Guptibacillaceae fam. nov. harbouring the genera Guptibacillus gen. nov. and Exobacillus gen. nov. Int J Syst Evol Microbiol 2025; 75:6757. 🇨🇦
  • ⏲ According to Bello et al. (2025), this species is a later heterotypic synonym of Pseudalkalibacillus hwajinpoensis (Yoon et al. 2004) Joshi et al. 2022. Publication: Bello S, Rudra B, Schellhorn HE. Phylogenomic studies and molecular markers clarifying the evolutionary relationships and classification of Pseudalkalibacillus species: proposal for the family Guptibacillaceae fam. nov. harbouring the genera Guptibacillus gen. nov. and Exobacillus gen. nov. Int J Syst Evol Microbiol 2025; 75:6757. 🇨🇦
  • ⏲ According to Bello et al. (2025), this species is a later heterotypic synonym of Guptibacillus hwajinpoensis (Yoon et al. 2004) Bello et al. 2025. Publication: Bello S, Rudra B, Schellhorn HE. Phylogenomic studies and molecular markers clarifying the evolutionary relationships and classification of Pseudalkalibacillus species: proposal for the family Guptibacillaceae fam. nov. harbouring the genera Guptibacillus gen. nov. and Exobacillus gen. nov. Int J Syst Evol Microbiol 2025; 75:6757. 🇨🇦
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 75, part 5 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6824.
  • ❗ Alkalihalobacillus macyae is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Alkalihalobacillus.
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 2 times in PubMed until 2026-06-11.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of 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.
  • 🧍 According to Ludwig et al. (2021), this "species should be reclassified as a member of Anaerobacillus". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218. 🇪🇸

Parent taxon: Alkalihalobacillus Patel and Gupta 2020

Assigned by: Patel S, Gupta RS. A phylogenomic and comparative genomic framework for resolving the polyphyly of the genus Bacillus: Proposal for six new genera of Bacillus species, Peribacillus gen. nov., Cytobacillus gen. nov., Mesobacillus gen. nov., Neobacillus gen. nov., Metabacillus gen. nov. and Alkalihalobacillus gen. nov. Int J Syst Evol Microbiol 2020; 70:406-438. 🇨🇦

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Record number: 7372