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Scientific classification
Kingdom: Bacteria
Phylum: Firmicutes
Class: Clostridia Rainey 2010
Order: Halanaerobiales Rainey and Zhilina 1995
Families & Genera

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 Firmicutes. Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism.[1]


The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[2] and National Center for Biotechnology Information (NCBI)[3] and the phylogeny is based on 16S rRNA-based LTP release 106 by The All-Species Living Tree Project.[4]


Halarsenatibacter silvermanii Switzer Blum et al. 2010

Halothermothrix orenii Cayol et al. 1994

Halocella cellulosilytica Simankova et al. 1994


?H. alcaliphilum Tsai et al. 1995

?H. hydrogeniformansBrown et al. 2011

H. salsuginis Bhupathiraju et al. 1994

H. fermentans Kobayashi et al. 2000

H. lacusrosei Cayol et al. 1995

H. acetethylicum (Rengpipat et al. 1989) Rainey et al. 1995

H. sehlinense Abdeljabbar et al. 2013

H. kushneri Bhupathiraju et al. 1999

H. praevalens Zeikus et al. 1984

H. congolense Ravot et al. 1998

H. saccharolyticum saccharolyticum (Zhilina et al. 1992) Rainey et al. 1995

H. saccharolyticum senegalense (Cayol et al. 1994) Rainey et al. 1995


?Sporohalobacter lortetii (Oren 1984) Oren et al. 1988

Acetohalobium arabaticum Zhilina and Zavarzin 1990

Selenihalanaerobacter shriftii Switzer Blum et al. 2001


N. acetigena Zhilina et al. 1996

N. sulfidigena Sorokin et al. 2011


O. marismortui (Oren et al. 1988) Rainey et al. 1995

O. salinaria Mouné et al. 2000

Orenia sivashensis Zhilina et al. 2000

Halonatronum saccharophilum Zhilina et al. 2001

Halanaerobaculum tunisiense Hedi et al. 2009

Halobacteroides halobius Oren et al. 1984 [Type sp.]


?H. chitinovorans Liaw and Mah 1996

H. salinarius Mouné et al. 1999

H. lacunarum (Zhilina et al. 1992) Rainey et al. 1995

Halobacteroides elegans Zhilina et al. 1997

♠ Strains found at the National Center for Biotechnology Information (NCBI) but not listed in the List of Prokaryotic names with Standing in Nomenclature (LSPN).


  1. ^ Singh OV (2012). Extremophiles: Sustainable Resources and Biotechnological Implications. John Wiley & Sons. pp. 76–79. ISBN 978-1-118-10300-5. 
  2. ^ J.P. Euzéby. "Halanaerobiales". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved 2011-11-17. 
  3. ^ Sayers; et al. "Halanaerobiales". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2011-06-05. 
  4. ^ All-Species Living Tree Project."16S rRNA-based LTP release 106 (full tree)" (PDF). Silva Comprehensive Ribosomal RNA Database. Retrieved 2011-11-17. 

Further reading[edit]

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.