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 Paleoheterodonta see Order Unionida Gray, 1854
               Order Unionoida see Order Unionida Gray, 1854
                 Superfamily Unionacea Fleming, 1828 see Superfamily Unionoidea Rafinesque, 1820
                   Family Unionidae Rafinesque, 1820 - pearly mussels
                     1 Subfamily Unioninae Rafinesque, 1820
                     2 Subfamily Pleurobeminae see Tribe Pleurobemini Hannibal, 1912
                     3 Subfamily Popenaiadinae Heard & Guckert, 1970 see Tribe Amblemini Rafinesque, 1820
                     4 Subfamily Anodontinae Rafinesque, 1820 see Tribe Anodontini Rafinesque, 1820
                     5 Subfamily Lampsilinae see Tribe Lampsilini Ihering, 1901