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
                       1 Genus Alkalicaulis Kevbrin et al. 2021
                       2 Genus Glycocaulis Abraham et al. 2013
                       3 Genus Hyphobacterium Sun et al. 2017
                       4 Genus Maricaulisᵀ Abraham et al. 1999
                       5 Genus Marinicauda Zhang et al. 2013 [monotypic]
                       6 Genus Oceanicaulis Strömpl et al. 2003
                       7 Genus Photocaulis Kuzyk et al. 2023
                       8 Genus Woodsholea Abraham et al. 2004
                       9 Genus "Euryhalocaulis" Deng et al. 2013 nom. inval.