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 Bacteroidota Krieg et al. 2021
                 Class Saprospiria Hahnke et al. 2018 [monotypic]
                   Order Saprospiralesᵀ Hahnke et al. 2017
                     Family Saprospiraceaeᵀ Krieg et al. 2012
                       Genus "Candidatus Aquirestis" Hahn and Schauer 2007 [monotypic]
                         "Candidatus Aquirestis calciphila"ᵀ Hahn and Schauer 2007