Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Protobranchia Pelseneer, 1889 Order Nuculida Dall, 1889 Superfamily Nuculanoidea Adams & Adams, 1858 (1854) Family Malletiidae Adams & Adams, 1858 (1846) Genus Katadesmia Dall, 1908