Құрып кеткен динозаврлар туысы: Notohypsilophodon

Extinct genus of dinosaurs

Notohypsilophodon (meaning "southern Hypsilophodon") is a genus of ornithopod dinosaur from the Late Cretaceous of Argentina. It was described as the only "hypsilophodont" known from South America, although this assessment is not universally supported, and Gasparinisaura is now believed to have been a basal euornithopod as well.

From 1985 onwards the Laboratorio de Paleovertebrados of the Universidad Nacional de la Patagonia "San Juan Bosco" organised excavations in the late Cenomanian early Turonian age Bajo Barreal Formation of the San Jorge Basin, northern Chubut, Patagonia. At Buen Pasto near Comodoro Rivadavia a partial juvenile skeleton lacking the skull, was found.

Martínez found no evidence that Notohypsilophodon was an iguanodont, and instead assigned it to the more basal Hypsilophodontidae, which made it at the time the only South American hypsilophodont. A hypsilophodontid assignment was supported by Rodolfo Coria in a 1999 review of South American ornithopods, but a more recent review of basal ornithopods found the fossil remains to be too fragmentary for classification beyond Euornithopoda, a clade within Ornithopoda including the "hypsilophodonts" and iguanodonts. Moreover, the Hypsilophodontidae are today considered to be a paraphyletic group, not consisting of directly related species forming a separate branch, but representing a series of successive branches splitting off the main euornithopod tree. In 2015, it was found to be part of the clade Elasmaria along with other Antarctic and Patagonian ornithopods. Cladogram based in the phylogenetic analysis of Rozadilla et al., 2015: