Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Beggiatoales Buchanan 1957 (Approved Lists 1980)
                     Family Leucotrichaceae Buchanan 1957 (Approved Lists 1980)
                       1 Genus Cocleimonas Tanaka et al. 2011 [monotypic]
                       2 Genus Leucothrixᵀ Örsted 1844 (Approved Lists 1980) [monotypic]
                       3 Genus Thiobacterium (ex Janke 1924) La Riviere and Kuenen 1989 [monotypic]
                       4 Genus Thiofilum Boden and Scott 2018
                       5 Genus Thiolinea Boden and Scott 2018
                       6 Genus Thiospira Visloukh 1914 (Approved Lists 1980) [monotypic]
                       7 Genus Thiothrix Winogradsky 1888 (Approved Lists 1980)