[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Class Bivalvia Linnaeus, 1758 - bivalves
       Family Mactridae Lamarck, 1809 - surf clams
         1 Genus Mactra Linnaeus, 1767
         2 Genus Spisula Gray, 1837
         3 Genus Lutraria Lamarck, 1799
         4 Genus Eastonia Gray, 1853