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 Protobranchia Pelseneer, 1889
               Order Nuculoida - nut clams see Order Nuculida Dall, 1889
                 Superfamily Nuculacea Gray, 1824 see Superfamily Nuculoidea Gray, 1824
                   Family Nuculidae Gray, 1824 - nut clams
                     1 Genus Nucula Lamarck, 1799
                     2 Genus Acila Adams & Adams, 1858
                     3 Genus Brevinucula Thiele, 1934
                     4 Genus Pronucula Hedley, 1902