Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
       Order Pteriida Newell, 1965
         Suborder Pinnina Leach, 1819 [monotypic] see Superfamily Pinnoidea Leach, 1819
           Superfamily Pinnoidea Leach, 1819 [monotypic]
             Family Pinnidae Leach, 1819 - pen clams
               Genus Pinna Linnaeus, 1758
                 Subgenus Oxisma Rafinesque, 1819