Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
       Order Pteriida Newell, 1965
         Suborder Pteriina Newell, 1965 [monotypic] see Superfamily Pterioidea Gray, 1847 (1820)
           Superfamily Pterioidea Gray, 1847 (1820)
             Family Isognomonidae Woodring, 1925 (1828)
               Genus Crenatula Lamarck, 1803