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 Alphaproteobacteria Garrity et al. 2006
                   Order Caulobacteralesᵀ Henrici and Johnson 1935 (Approved Lists 1980)
                     Family Maricaulaceae Kevbrin et al. 2021
                       Genus Maricaulisᵀ Abraham et al. 1999
                         1 Maricaulis marisᵀ (Poindexter 1964) Abraham et al. 1999
                         2 Maricaulis parjimensis Abraham et al. 2002
                         3 Maricaulis salignorans Abraham et al. 2002
                         4 Maricaulis virginensis Abraham et al. 2002
                         5 Maricaulis washingtonensis Abraham et al. 2002