Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Orthogastropoda Ponder & Lindberg, 1995 Superorder Heterobranchia Burmeister, 1837 Order Opisthobranchia Milne-Edwards, 1848 Suborder Sacoglossa Ihering, 1876 see Order Sacoglossa Ihering, 1876 1 Superfamily Oxynooidea Stoliczka, 1868 (1847)