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 Veneracea Rafinesque, 1815 see Superfamily Veneroidea Rafinesque, 1815
                   Family Veneridae Rafinesque, 1815 - venus clams
                     01 Genus Mercenaria Schumacher, 1817
                     02 Subfamily Venerinae Rafinesque, 1815
                     03 Subfamily Circinae Dall, 1895, nom. illeg. see Subfamily Gouldiinae Stewart, 1930
                     04 Subfamily Sunettinae Stoliczka, 1870
                     05 Subfamily Meretricinae Gray, 1847
                     06 Subfamily Pitarinae Stewart, 1930 see Subfamily Callocardiinae Dall, 1895
                     07 Subfamily Samarangiinae Keen, 1969
                     08 Subfamily Dosiniinae Deshayes, 1853
                     09 Subfamily Cyclininae Frizzell, 1936 see Subfamily Chioninae Frizzell, 1936, nom. illeg.
                     10 Subfamily Gemminae Dall, 1895
                     11 Subfamily Clementiinae Frizzell, 1936
                     12 Subfamily Tapetinae Gray, 1851
                     13 Subfamily Chioninae Frizzell, 1936, nom. illeg.