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 Platyhelminthes Gegenbaur, 1859 - flatworms
           Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
             Order Prolecithophora Karling, 1940
               Suborder Combinata
                 Family Cylindrostomidae
                   1 Subfamily Cylindrostominae see Family Cylindrostomidae
                   2 Subfamily Pseudostominae see Family Pseudostomidae Graff, 1904-08
                   3 Subfamily Scleraulophorinae see Family Scleraulophoridae Marcus, 1950