Opisthodactylus

Opisthodactylus Temporal range: Early-Late Miocene (Colhuehuapian-Montehermosan) ~20–3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Infraclass:	Palaeognathae
Order:	Rheiformes
Family:	Rheidae
Genus:	†Opisthodactylus Ameghino 1891
Species
† O. patagonicus Ameghino 1891 (type) † O. horacioperezi Agnolin & Chafrat 2015 † O. kirchneri Noriega et al. 2017

Opisthodactylus is an extinct genus of rhea from the Early to Middle Miocene Santa Cruz and Chichinales Formations and the Late Miocene (Montehermosan) Andalhuala Formation of Argentina. Three species are described: the type species, O. patagonicus, O. kirchneri and O. horacioperezi. The species O. kirchneri was described in 2017 by Noriega et al.^[1] Fossils of O. horacioperezi were found together with fossils of Patagorhacos terrificus.^[2]

References

Further reading

• The Origin and Evolution of Birds by Alan Feduccia

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Palaeognath genera

Kingdom: Animalia Phylum: Chordata Class: Aves
Avemetatarsalia see Avemetatarsalia Theropoda see Theropoda Maniraptora see Maniraptora Palaeognathae see below↓

Palaeognathae
Palaeognathae †Asteriornis? †Eremopezus? †Limenavis? †Lithornithidae Calciavis Fissuravis Lithornis Paracathartes Pseudocrypturus Struthioniformes †Remiornis? †Geranoididae? Eogeranoides Galligeranoides? Geranodornis Palaeophasianus Paragrus †Palaeotididae? Palaeotis Galligeranoides? †Eogruidae? Eogrus Sonogrus †Ergilornithidae? Amphipelargus Ergilornis Sinoergilornis Urmiornis Struthionidae †Orientornis †Pachystruthio? Struthio Notopalaeognathae see below↓

Notopalaeognathae
Rheiformes †Opisthodactylidae Diogenornis? Opisthodactylus Rheidae †Heterorhea †Hinasuri †Protorhea Rhea †Dinornithiformes Dinornis Megalapteryx Emeidae Anomalopteryx Emeus Euryapteryx Pachyornis Tinamidae †Miniothura †Querandiornis †Roveretornis Tinaminae Crypturellus Nothocercus Tinamus Nothurinae Eudromia Nothoprocta Nothura Rhynchotus Taoniscus Tinamotis Novaeratitae Apterygidae Apteryx †Proapteryx †Aepyornithidae Aepyornis Mullerornis Casuariiformes †Diogenornis? Casuariidae Casuarius Dromaius †Emuarius

Ootaxa
Diamantornis Incognitoolithus Medioolithus Namornis Psammornis Tsondabornis

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