living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Bivalvia Linnaeus, 1758 - bivalves
             Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884
               Order Veneroida H. & A. Adams, 1856 see Order Venerida Gray, 1854
                 Superfamily Cardiacea Lamarck, 1809 see Superfamily Cardioidea Lamarck, 1809
                   Family Cardiidae Lamarck, 1809 - cockles
                     1 Subfamily Cardiinae Lamarck, 1809
                     2 Subfamily Trachycardiinae Stewart, 1930
                     3 Subfamily Fraginae Stewart, 1930
                     4 Subfamily Protocardiinae Reuss, 1846
                     5 Subfamily Laevicardiinae Keen, 1951
                     6 Subfamily Clinocardiinae Kafanov, 1975