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 Myoida Stoliczka, 1870 see Order Myida Stoliczka, 1870
                 Superfamily Pholadacea Lamarck, 1809, nom. illeg. see Superfamily Pholadoidea Lamarck, 1809
                   Family Pholadidae Lamarck, 1809 - piddocks
                     Subfamily Martesiinae Grant & Gale, 1931
                       Genus Penitella Valenciennes, 1846