[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Mollusca Linnaeus, 1758 - molluscs
         Branch Lipocephala
           Class Lamellibranchia
             Order Asiphonia
               1 Genus Arca Linnaeus, 1758
               2 Genus Unio Philipsson, 1788