Phylum Mollusca Linnaeus, 1758 - molluscs Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878 Cyrtosoma 1 Class Cephalopoda Cuvier, 1795 - cephalopods 2 Class Gastropoda Cuvier, 1795 - snails and slugs