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. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980)
                   Order Entomoplasmatales Tully et al. 1993
                     Family Spiroplasmataceae (ex Skripal' 1974) Skripal' 1983 [monotypic]
                       1 Genus Spiroplasmaᵀ Saglio et al. 1973 (Approved Lists 1980)