Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Protobranchia Pelseneer, 1889 Order Nuculida Dall, 1889 Superfamily Nuculoidea Gray, 1824 Family Pristiglomidae Sanders & Allen, 1973 see Subfamily Pristiglominae Sanders & Allen, 1973 Genus Pristigloma Dall, 1900