[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Thiotrichales Garrity et al. 2005
           Family Thiotrichaceae Garrity et al. 2005
             1 Genus Thiothrix Winogradsky 1888 (Approved Lists 1980)
             2 Genus Achromatium Schewiakoff 1893 (Approved Lists 1980)
             3 Genus Beggiatoa Trevisan 1842 (Approved Lists 1980)
             4 Genus Leucothrix Oersted 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)