= Francisellales Chuvochina et al., 2024 (established)
= Piscirickettsiales Chuvochina et al., 2024 (established)
= Thiomicrospirales Chuvochina et al., 2024 (established)
= Thiotrichales Garrity et al., 2005
Beggiatoales Buchanan, 1957 (Approved Lists 1980)
domain: Bacteria Woese et al., 2024 >
phylum: Pseudomonadota Garrity et al., 2021 >