Halanaerobiales

Halanaerobiales
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Bacillota
Class:	Clostridia
Order:	Halanaerobiales corrig. Rainey and Zhilina 1995
Families [1] [2]
Acetohalobiaceae Halanaerobiaceae Halarsenatibacteraceae Halobacteroidaceae Halothermotrichaceae
Synonyms
Halobacteroidales Chuvochina et al. 2024

The Halanaerobiales are an order of bacteria placed within the class Clostridia, and encompassing two families, the Halanaerobiaceae and the Halobacteroidaceae. Originally placed within the highly polyphyletic class Clostridia, according to the NCBI and LPSN, it is now thought to lie outside the Bacillota.^{[ citation needed ]} Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism. ^[3]

Phylogeny

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) ^[1] and National Center for Biotechnology Information (NCBI). ^[2]

16S rRNA based LTP_10_2024 [4] [5] [6]

120 marker proteins based GTDB 10-RS226 [7] [8] [9]

"Anoxybacteraceae" Anoxybacter Halanaerobiaceae Halarsenatibacter Halothermothrix Halocella corrig. Simankova et al. 1994 Halanaerobium Halobacteroidaceae Acetohalobium Sporohalobacter Fuchsiella Selenihalanaerobacter Halanaerobaculum Hedi et al. 2009 Halobacteroides Halanaerobacter Natroniella Orenia (incl. Halonatronum )

"Anoxybacterales" "Anoxybacteraceae" Anoxybacter Zeng et al. 2015 Halanaerobiales DTU029 Iocasia Zhang et al. 2025 Halothermotrichaceae Halothermothrix Cayol et al. 1994 Halarsenatibacteraceae Halarsenatibacter Switzer Blum et al. 2010 Halonatronomonas Detkova, Boltyanskaya & Kevbrin 2023 Halanaerobiaceae Halanaerobium corrig. Zeikus et al. 1984 Halobacteroidales Acetohalobiaceae Fuchsiella Zhilina et al. 2012 "Ca. Frackibacter" Daly et al. 2016 Selenihalanaerobacter Switzer Blum et al. 2001 Acetohalobium Zhilina and Zavarzin 1990 Sporohalobacter Oren et al. 1988 Halobacteroidaceae Natroniella Zhilina et al. 1996 Halonatronum Zhilina et al. 2001 Orenia Rainey & Stackebrandt 1995 Halobacteroides Oren et al. 1984 Halanaerobacter corrig. Liaw & Mah 1996

• Unassigned Halanaerobiales:
  • "Candidatus Natronospora" Sorokin, Merkel & Khizhniak 2025
• Unassigned Halobacteroidaceae:
  • Halanaerocella Gales et al. 2025

See also

• List of bacterial orders
• List of bacteria genera

References

1. Halanaerobiales in LPSN ; Freese, H. M.; Meier-Kolthoff, J. P.; Sardà Carbasse, J.; Afolayan, A. O.; Göker, M. (29 October 2025). "TYGS and LPSN in 2025: a Global Core Biodata Resource for genome-based classification and nomenclature of prokaryotes within DSMZ Digital Diversity". Nucleic Acids Research. 53: D1 –D12. doi:10.1093/nar/gkaf1110.
2. Schoch CL; et al. "Halanaerobiales". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2025-06-05.
3. Singh OV (2012). Extremophiles: Sustainable Resources and Biotechnological Implications. John Wiley & Sons. pp. 76–79. ISBN   978-1-118-10300-5.
4. "The LTP" . Retrieved 10 December 2024.
5. "LTP_all tree in newick format" . Retrieved 10 December 2024.
6. "LTP_10_2024 Release Notes" (PDF). Retrieved 10 December 2024.
7. "GTDB release 10-RS226". Genome Taxonomy Database . Retrieved 1 May 2025.
8. "bac120_r226.sp_label". Genome Taxonomy Database . Retrieved 1 May 2025.
9. "Taxon History". Genome Taxonomy Database . Retrieved 1 May 2025.

Further reading

Bardavid, Rahel Elevi; Oren, Aharon (2012). "The amino acid composition of proteins from anaerobic halophilic bacteria of the order Halanaerobiales". Extremophiles. 16 (3): 567–572. doi:10.1007/s00792-012-0455-y.