Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Lucinoidea Fleming, 1828 Family Thyasiridae Dall, 1900 (1895) Subfamily Axinopsidinae Frank Bernard, 1983 Genus Axinopsida Keen & Chavan, 1951