[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria Garrity et al. 2005
         Order Thiotrichales Garrity et al. 2005 nom. illeg. see Order Beggiatoales Buchanan 1957 (Approved Lists 1980)
           Family Thiotrichaceae Garrity et al. 2005 nom. illeg. see Family Leucotrichaceae Buchanan 1957 (Approved Lists 1980)
             1 Genus Thiothrix Winogradsky 1888 (Approved Lists 1980)
             2 Genus Achromatium Schewiakoff 1893 (Approved Lists 1980)
             3 Genus Beggiatoa Trevisan 1842 nom. cons. (Approved Lists 1980)
             4 Genus Leucothrix Örsted 1844 (Approved Lists 1980)
             5 Genus Thiobacterium (ex Janke 1924) La Riviere and Kuenen 1989
             6 Genus Thiomargarita Schulz et al. 1999
             7 Genus Thioploca Lauterborn 1907 (Approved Lists 1980)
             8 Genus Thiospira Visloukh 1914 (Approved Lists 1980)