Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 1990 [paraphyletic?] Phylum Thermotogae Reysenbach 2001 [monotypic] Class Thermotogaeᵀ Reysenbach 2002 [monotypic] Order Mesoaciditogales Itoh et al. 2016 [monotypic] Family Mesoaciditogaceaeᵀ Itoh et al. 2016 [monotypic] Genus Mesoaciditogaᵀ Reysenbach et al. 2013 [monotypic] Mesoaciditoga lauensisᵀ Reysenbach et al. 2013