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
                   1 Subfamily Atyinae Thiele, 1925, nom. illeg.
                   2 Subfamily Bullactinae Thiele, 1926 see Family Bullactidae Thiele, 1926
                   3 Subfamily Lathopthalminae
                   4 Subfamily Hamineinae Pilsbry, 1895, orth. inval. see Subfamily Haminoeinae Pilsbry, 1895