Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Order Mytiloida Férussac, 1822 see Order Mytilida Férussac, 1822
       Superfamily Pinnacea Leach, 1819, nom. illeg. see Superfamily Pinnoidea Leach, 1819
         Family Pinnidae Leach, 1819 - pen clams
           1 Genus Atrina Gray, 1842
           2 Genus Pinna Linnaeus, 1758
           3 Genus Streptopinna Martens, 1880