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 Cardioidea Lamarck, 1809
           Family Cardiidae Lamarck, 1809 - cockles
             Subfamily Trachycardiinae Stewart, 1930
               Genus Trachycardium Mörch, 1853
                 1 Subgenus Dallocardia Stewart, 1930
                 2 Subgenus Mexicardia Stewart, 1930
                 3 Subgenus Phlogocardia Stewart, 1930