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 Spinulidae Allen & Sanders, 1982 [monotypic] see Family Bathyspinulidae Coan & Valentich-Scott, 1997 1 Genus Spinula Dall, 1908