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 Fraginae Stewart, 1930
               1 Genus Fragum Röding, 1798
               2 Genus Corculum Röding, 1798
               3 Genus Ctenocardia Adams & Adams, 1857
               4 Genus Trigoniocardia Dall, 1900