Halanaerobiales

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]

Halanaerobiales
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Bacillota
Class:	Clostridia
Order:	Halanaerobiales corrig. Rainey and Zhilina 1995
Families[1][2]
Halanaerobiaceae Halobacteroidaceae

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 09-RS220[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. 2021 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 Halobacteroides Oren et al. 1984 Halanaerobacter corrig. Liaw & Mah 1996 Natroniella Zhilina et al. 1996 Halonatronum Zhilina et al. 2001 Orenia Rainey & Stackebrandt 1995

Unassigned Halobacteroideae:

• "Halanaerocella" Gales et al. 2011

See also

• List of bacterial orders
• List of bacteria genera