procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Gammaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Gammaproteobacteria Garrity et al. 2005
         Order "Thiotrichales" "Garrity and Holt 2001" nom. nud. see Order Thiotrichales Garrity et al. 2005 nom. illeg.
           Family "Thiotrichaceae" Pringsheim 1949 nom. inval. see Family Thiotrichaceae Garrity et al. 2005 nom. illeg.
             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 Macromonas Utermöhl and Koppe 1924 (Approved Lists 1980)
             6 Genus Thiobacterium (ex Janke 1924) La Riviere and Kuenen 1989
             7 Genus Thiomargarita Schulz et al. 1999
             8 Genus Thioploca Lauterborn 1907 (Approved Lists 1980)
             9 Genus Thiospira Visloukh 1914 (Approved Lists 1980)