living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Bryozoa Ehrenberg, 1831 - bryozoans
           Class Gymnolaemata Allman, 1856
             Order Cheilostomata Busk, 1859 - cheilostomes
               Suborder Ascophora Findenegg, 1924
                 Family Smittinidae Levinsen, 1909
                   1 Genus Smittinaᵀ Norman, 1903
                   2 Genus Palmicellaria Alder, 1864
                   3 Genus Parasmittina Osburn, 1952
                   4 Genus Prenantia Gautier, 1962
                   5 Genus Porella Gray, 1848
                   6 Genus Smittoidea Osburn, 1952