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          Tetrapoda
            Aves
                    Rheiformes
                            Rheidae
                                     Pterocnemia
                                           [Pteroicnemia]
                                             Pterocnemia pennata
                                                   [Pteroicnemia pennata]
                                                   [Rhea pennata]
                                               Pterocnemia pennata garleppi
                                               Pterocnemia pennata pennata
                                               Pterocnemia pennata tarapacensis
                                     Rhea
                                             Rhea americana
                                               Rhea americana albescens
                                               Rhea americana americana
                                               Rhea americana araneipes
                                               Rhea americana intermedia
                                               Rhea americana nobilis