Notohypsilophodon

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Notohypsilophodon
Temporal range:
Ma
Life restoration
of Notohypsilophodon
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: †Ornithischia
Clade: †Ornithopoda
Clade: †Elasmaria
Genus: †Notohypsilophodon
Martínez, 1998
Species:
†N. comodorensis
Binomial name
†Notohypsilophodon comodorensis
Martínez, 1998

Notohypsilophodon (meaning "southern

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.[1]

History of discovery

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.[2]

In 1998 this find was named and described by Rubén D. Martínez as the type species Notohypsilophodon comodorensis. The generic name combines a Greek νότος, notos, "south wind" with the name of the genus Hypsilophodon. The specific name refers to Comodoro Rivadavia.[2]

Notohypsilophodon is based on the

neural arches are not fused to the bodies of the vertebrae, its describer regarded the individual as not fully grown.[2]

Description

As a "hypsilophodontid" or other basal ornithopod, Notohypsilophodon would have been a bipedal herbivore. Its size was not estimated in the describing article, but as most adult hypsilophodonts were 1 to 2 meters (3.3 to 6.6 ft) long,[3] this genus would probably have been of similar size. In 2010 Gregory S. Paul gave an estimation of 1.3 metres (4.3 ft) for the length, 6 kilograms (13 lb) for the weight of the animal.[4]

Phylogeny

Martínez found no evidence that Notohypsilophodon was an

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.[3] A recent redescription of Notohypsilophodon found it to be basal in Ornithopoda, more primitive than Gasparinisaura.[6] In 2015, it was found to be part of the clade Elasmaria along with other Antarctic and Patagonian ornithopods.[7]

phylogenetic analysis
of Rozadilla et al., 2015:

References
  1. ^ Sebastián Rozadilla, Federico L. Agnolin, Fernando E. Novas, Alexis M. Aranciaga Rolando, Matías J. Motta, Juan M. Lirio & Marcelo P. Isasi, 2016, "A new ornithopod (Dinosauria, Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications", Cretaceous Research 57: 311–324
  2. ^ a b c d Martínez, Rubén D. (1998). "Notohypsilophodon comodorensis, gen. et sp. nov., un Hypsilophodontidae (Ornithischia: Ornithopoda) del Cretacico Superior de Chubut, Patagonia central, Argentina". Acta Geologica Leopoldensia (in Spanish and English). 21 (46/47): 119–135.
  3. ^
    ISBN 978-0-520-24209-8
    .
  4. ^ Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 277
  5. ISSN 1342-9574
    .
  6. PMID 24869543
    .
  7. doi:10.1016/j.cretres.2015.09.009
    .
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