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 Mollusca Linnaeus, 1758 - molluscs
           Class Gastropoda Cuvier, 1795 - snails and slugs
             Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
               Order Cephalaspidea Fischer, 1883
                 Family Atyidae Thiele, 1925, orth. rej. see Family Atydidae Thiele, 1925
                   Subfamily Hamineinae Pilsbry, 1895, orth. inval. see Subfamily Haminoeinae Pilsbry, 1895
                     Genus Cylichnium Dall, 1908