Phylum Mollusca Linnaeus, 1758 - molluscs Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878 1 Class Monoplacophora Odhner, 1940 - monoplacophorans 2.1 †Rostroconchia Cox, 1960 see Class Rostroconchia Pojeta et al., 1972 2.2 Class Bivalvia Linnaeus, 1758 - bivalves 3 Class Scaphopoda Bronn, 1862 - tusk shells 4 Cyrtosoma