Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Gastropoda Cuvier, 1795 - snails and slugs 1 Subclass Eogastropoda Ponder & Lindberg, 1995 2 Subclass Orthogastropoda Ponder & Lindberg, 1995