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
         Superfamily Acteonoidea d'Orbigny, 1843
           Family Haminoeidae Pilsbry, 1895
             Subfamily Hamineinae Pilsbry, 1895, orth. inval. see Subfamily Haminoeinae Pilsbry, 1895
               Genus Nipponatys Kuroda & Habe, 1952