Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Protobranchia Pelseneer, 1889 Order Solemyida Dall, 1889 Superfamily Nucinelloidea Vokes, 1956 [monotypic] see Superfamily Manzanelloidea Chronic, 1952 Family Nucinellidae Vokes, 1956 see Family Manzanellidae Chronic, 1952 Genus Huxleyia Adams, 1860