Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
       Order Arcida Gray, 1854
         Suborder Arcina Stoliczka, 1871 see Order Arcida Gray, 1854
           Superfamily Arcoidea Lamarck, 1809
             Family Arcidae Lamarck, 1809 - arks
               Subfamily Arcinae Lamarck, 1809
                 Genus Arca Linnaeus, 1758
                   Subgenus Eonavicula Arkell, 1929