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 Brachiopoda Duméril, 1806 - brachiopods
           Class Inarticulata (Huxley, 1869)
             Order Acrotretida Kuhn, 1949
               Suborder Acrotretidina Kuhn, 1949 see Order Lingulida Waagen, 1885
                 Superfamily Discinacea Gray, 1840 see Superfamily Discinoidea Gray, 1840
                   Family Discinidae Gray, 1840
                     1 Genus Discina Lamarck, 1819
                     2 Genus Discinisca Dall, 1871
                     3 Genus Discradisca Stenzel, 1964
                     4 Genus Pelagodiscus Dall, 1908