Name: "Pseudalkalibacillus macyae" (Santini et al. 2004) Joshi et al. 2021

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: pse͡ud-al-ka-li-ba-KIL-lus MA-ky-a͡e, masculine

Nomenclatural type: DSM 16346; JCM 12340; JMM-4

See detailed strain information at

16S rRNA gene: AY032601 Analyse FASTA

Original publication: Joshi A, Thite S, Karodi P, Joseph N, Lodha T. Alkalihalobacterium elongatum gen. nov. sp. nov.: An Antibiotic-Producing Bacterium Isolated From Lonar Lake and Reclassification of the Genus Alkalihalobacillus Into Seven Novel Genera. Front Microbiol 2021; 12:722369. 🇮🇳

Nomenclatural status: not validly published

Taxonomic status: synonym (and no standing)

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

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

• 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.

Parent taxon: Pseudalkalibacillus Joshi et al. 2022

Assigned by: Joshi A, Thite S, Karodi P, Joseph N, Lodha T. Alkalihalobacterium elongatum gen. nov. sp. nov.: An Antibiotic-Producing Bacterium Isolated From Lonar Lake and Reclassification of the Genus Alkalihalobacillus Into Seven Novel Genera. Front Microbiol 2021; 12:722369. 🇮🇳

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Record number: 23036