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 Beggiatoaceaeᵀ Migula 1894 (Approved Lists 1980)
                       01 Genus Beggiatoaᵀ Trevisan 1842 nom. cons. (Approved Lists 1980) [monotypic]
                       02 Genus Thioflexithrix Gureeva et al. 2019
                       03 Genus Thiomargarita Schulz et al. 1999 [monotypic]
                       04 Genus Thioploca Lauterborn 1907 (Approved Lists 1980)
                       05 Genus "Candidatus Allobeggiatoa" Hinck et al. 2020
                       06 Genus "Candidatus Halobeggiatoa" Grünke et al. 2022
                       07 Genus "Candidatus Isobeggiatoa" Salman et al. 2020
                       08 Genus "Candidatus Maribeggiatoa" Salman et al. 2020
                       09 Genus "Candidatus Marithioploca" Salman et al. 2020
                       10 Genus "Candidatus Marithrix" Salman et al. 2020
                       11 Genus "Candidatus Parabeggiatoa" Salman et al. 2020
                       12 Genus "Candidatus Thiolava" Danovaro et al. 2020
                       13 Genus "Candidatus Thiophysa" Salman et al. 2020
                       14 Genus "Candidatus Thiopilula" Salman et al. 2020
                       15 Genus "Candidatus Venteria" Fonseca et al. 2020
                       16 Genus "Candidatus Albibeggiatoa" Ravin et al. 2024 nom. pro-inval.