Genus Pseudalkalibacillus

Name: Pseudalkalibacillus Joshi et al. 2022

Category: Genus

Proposed as: gen. nov.

Etymology: Pseud.al.ka.li.ba.cil’lus. Gr. masc./fem. adj. pseudês, false; N.L. masc. n. Alkalibacillus, a bacterial genus; N.L. masc. n. Pseudalkalibacillus, a false Alkalibacillus because it only tolerates alkaline pH but does not grow optimally at higher pH

Gender, pronunciation (Latin): masculine (stem: Pseudalkalibacill-), pse͡ud-al-ka-li-ba-KIL-lus

Type species: Pseudalkalibacillus decolorationis (Heyrman et al. 2003) Joshi et al. 2022

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective 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. 🇮🇳

IJSEM list: Oren A, Garrity GM. Validation list no. 203. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2022; 72:5167.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Synonyms:

Name	Kind
Exobacillus Bello et al. 2025	heterotypic synonym, validly published under the ICNP
Guptibacillus Bello et al. 2025	heterotypic synonym, validly published under the ICNP

Emendations:
- Bello et al. 2025 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. 🇨🇦 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.
  Notes:
  - ⊖ Emendation accompanied by the removal of 4 species from the genus.

Notes:
- 🧕 Li et al. (2024) assigned this genus to the family Fictibacillaceae Chuvochina et al. 2024. Publication: Li Y, Zhang D, Bo D, Peng D, Sun M, Zheng J. A taxonomic note on the order Caryophanales: description of 12 novel families and emended description of 21 families. Int J Syst Evol Microbiol 2024; 74:6539. 🇨🇳
- 🚋 The type species of this genus has alternatively been placed in the genus Alkalihalobacillus Patel and Gupta 2020. 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. 🇨🇦
- 🚋 The type species of this genus has alternatively been placed in the genus Bacillus Cohn 1872 (Approved Lists 1980). Publication: Heyrman J, Balcaen A, Rodriguez-Diaz M, Logan NA, Swings J, De Vos P. Bacillus decolorationis sp. nov., isolated from biodeteriorated parts of the mural paintings at the Servilia tomb (Roman necropolis of Carmona, Spain) and the Saint-Catherine chapel (Castle Herberstein, Austria). Int J Syst Evol Microbiol 2003; 53:459-463. 🇧🇪
- 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Pseudalkalibacilllus".
- 🎰 The BRCs most frequently used for deposits in this group are: KCTC: 5; JCM: 5; DSM: 4; LMG: 3; CGMCC: 2; KMM: 2; GDMCC: 2; MCCC: 1; EGI: 1; KCCM: 1.

Subdivision:

Number of child taxa with a validly published and correct name: 7
Number of child taxa with a validly published name, including synonyms: 7
Total number of child taxa: 11

Child taxa:

Name	Nomenclatural status	Taxonomic status
"Pseudalkalibacillus algicola" (Ivanova et al. 2004) Joshi et al. 2021	not validly published	synonym
Pseudalkalibacillus berkeleyi (Nedashkovskaya et al. 2012) Joshi et al. 2022	validly published under the ICNP	correct name
Pseudalkalibacillus caeni (Mo et al. 2020) Joshi et al. 2022	validly published under the ICNP	correct name
Pseudalkalibacillus decolorationis (Heyrman et al. 2003) Joshi et al. 2022	validly published under the ICNP	correct name
"Pseudalkalibacillus hemicentroti" (Chen et al. 2011) Joshi et al. 2021	not validly published	synonym
Pseudalkalibacillus hwajinpoensis (Yoon et al. 2004) Joshi et al. 2022	validly published under the ICNP	correct name
"Pseudalkalibacillus macyae" (Santini et al. 2004) Joshi et al. 2021	not validly published	synonym
"Pseudalkalibacillus nanhaiensis" Ge et al. 2025	not validly published	preferred name
Pseudalkalibacillus salsuginis Gao et al. 2022	validly published under the ICNP	correct name
Pseudalkalibacillus sedimenti Liu et al. 2023	validly published under the ICNP	correct name
Pseudalkalibacillus spartinae Liu et al. 2023	validly published under the ICNP	correct name

Parent taxon: Bacillaceae Fischer 1895 (Approved Lists 1980)

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: 26525

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Genus Pseudalkalibacillus