Phylum [Mollusca] Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Palaeotaxodonta Korobkov, 1954 see Subclass Protobranchia Pelseneer, 1889 1 Order Nuculoida - nut clams see Order Nuculida Dall, 1889