Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Heterodonta Neumayr, 1884
         Order Venerida Gray, 1854
           Superfamily Mactroidea Lamarck, 1809
             Family Mactridae Lamarck, 1809 - surf clams
               1 Subfamily Mactrinae Lamarck, 1809
               2 Subfamily Lutrariinae Gray, 1853
               3 Subfamily Kymatoxinae Stenzel & Krause, 1957
               4 Subfamily Tanysiphoninae Scarlato & Starobogatov, 1971
               5 Subfamily Zenatiinae Dall, 1895