Phylum Mollusca Linnaeus, 1758 - molluscs 1 Class Caudofoveata Boettger, 1956 [monotypic] - caudofoveatans 2 Class Solenogastres Gegenbaur, 1878 3 Class Polyplacophora Blainville, 1816 [monotypic] - chitons 4 Class Monoplacophora Odhner, 1940 [monotypic] - monoplacophorans 5 Class Gastropoda Cuvier, 1795 - snails and slugs 6 Class Cephalopoda Cuvier, 1795 - cephalopods 7 Class Bivalvia Linnaeus, 1758 - bivalves 8 Class Scaphopoda Bronn, 1862 - tusk shells