Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884
       Order Venerida Gray, 1854
         Superfamily Galeommatoidea Gray, 1840
           Family Galeommatidae Gray, 1840
             Genus Leiochasmea Dall, Bartsch & Rehder, 1938
               1 Subgenus Achasmea Dall, Bartsch & Rehder, 1938