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Temporal range: Late Cretaceous
Reconstructed skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Suborder: Theropoda
Family: Alvarezsauridae
Subfamily: Patagonykinae
Genus: Patagonykus
Novas, 1996
Species: † P. puertai
Binomial name
Patagonykus puertai
Novas, 1996

Patagonykus is a genus of theropod dinosaur from the Upper Cretaceous of Argentina. This alvarezsaur was discovered in exposures of the Portezuelo Member (Turonian-Coniacian) of the Rio Neuquen Formation in the Neuquen Province of Argentina. The holotype consists of an incomplete but well-preserved skeleton, lacking a skull, but including many vertebrae, the coracoids, a partial forelimb, pelvic girdle, and hindlimbs. Patagonykus ("Patagonian claw") has been classed with the Alvarezsauridae, a family which includes such taxa as the Mongolian Mononykus and the Argentinian Alvarezsaurus. Patagonykus is estimated to have been approximately two meters in length.


  • Novas, F. E. 1997. Anatomy of Patagonykus puertai (Theropoda, Avialae, Alvarezsauridae), from the Late Cretaceous of Patagonia. Journal of Vertebrate Paleontology 17(1); 137-166.
  • Novas, F. E. and Molnar, R. E. (eds.) 1996. Alvarezsauridae, Cretaceous basal birds from Patagonia and Mongolia. Proceedings of the Gondwanan Dinosaur Symposium, Brisbane. Memoirs of the Queensland Museum 39(3):iv + 489-731; 675-702.