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 Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
               Superorder Eupteriomorphia Boss, 1982 see Superorder Filibranchia
                 Order Pterioida Newell, 1965 see Order Pteriida Newell, 1965
                   Suborder Pinnina Leach, 1819 see Superfamily Pinnoidea Leach, 1819
                     Superfamily Pinnacea Leach, 1819, nom. illeg. see Superfamily Pinnoidea Leach, 1819
                       Family Pinnidae Leach, 1819 - pen clams
                         1 Genus Pinna Linnaeus, 1758
                         2 Genus Atrina Gray, 1842
                         3 Genus Streptopinna Martens, 1880