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 Mactracea Lamarck, 1809 see Superfamily Mactroidea Lamarck, 1809
                   Family Mactridae Lamarck, 1809 - surf clams
                     Subfamily Mactrinae Lamarck, 1809
                     Subfamily Lutrariinae Gray, 1853
                     Subfamily Pteropsellinae Keen, 1969 see Subfamily Kymatoxinae Stenzel & Krause, 1957
                     Subfamily Zenatiinae Dall, 1895
                     ?Subfamily [Tanysiphoninae] Scarlato & Starobogatov, 1971
                       Genus Tanysiphon Benson, 1858