[Mollusca] Linnaeus, 1758 - molluscs
   Bivalvia Linnaeus, 1758 - bivalves
     Mytiloida Férussac, 1822 see Order Mytilida Férussac, 1822
       Pinnacea Leach, 1819, nom. illeg. see Superfamily Pinnoidea Leach, 1819
         Pinnidae Leach, 1819 - pen clams
           Streptopinna Martens, 1880