Central Taxonomic Thesaurus

Taxon Search
  Animalia
      Mollusca
            Cephalopoda
                    Ammonoidea
                          Acanthocerataceae
                            Collignoniceratidae
                                     Prionocyclus
                                             Prionocyclus germari
                                             Prionocyclus hyatti
                                                   [Prionotropis hyatti]
                                             Prionocyclus macombi
                                             Prionocyclus novimexicanus
                                             Prionocyclus quadratus
                                             Prionocyclus wyomingensis