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 Cylichnidae Adams & Adams, 1854 Genus Nipponoscaphander Kuroda & Habe, 1971 see Genus Scaphander Montfort, 1810