Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884
       Order Chamida see Order Venerida Gray, 1854
         Superfamily Mactroidea Lamarck, 1809
           Family Mesodesmatidae Gray, 1840
             Subfamily Mesodesmatinae Gray, 1840
               Genus Atactodea Dall, 1895
                 1 Subgenus Mesodesma Deshayes, 1832
                 2 Subgenus Regterenia De Rooij-Schuiling, 1972