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. Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism.
Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI).
16S rRNA based LTP_10_2024 120 marker proteins based GTDB 10-RS226 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
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Further reading