Central Taxonomic Thesaurus

Taxon Search
  Animalia
      Mollusca
            Bivalvia
              Autobranchia
                Pteriomorphia
                    Ostreida
                          Ostreoidea
                            Gryphaeidae
                              Exogyrinae
                                     Exogyra
                                             Exogyra costata
                                     Ilymatogyra
                                             Ilymatogyra arietina
                                                   [Exogyra arietina]
                              Pycnodonteinae
                                     Pycnodonte