Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Protobranchia Pelseneer, 1889 Order Nuculida Dall, 1889 Superfamily Nuculoidea Gray, 1824 Family Nuculidae Gray, 1824 - nut clams Genus †Nuculanella Tasch, 1953