Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884
       Order Chamida see Order Venerida Gray, 1854
         Superfamily Tellinoidea Blainville, 1814
           Family Semelidae Stoliczka, 1870 (1825) - semelids
             Genus Abra Lamarck, 1818
               Subgenus Iacra Adams & Adams, 1856 see Genus Iacra Adams & Adams, 1856