Othnielia
From Wikipedia, the free encyclopedia
| Othnielia Fossil range: Late Jurassic |
||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Othnielia, North American Museum of Ancient Life.
|
||||||||||||||||||
| Scientific classification | ||||||||||||||||||
|
||||||||||||||||||
| Species | ||||||||||||||||||
|
- See Othnielosaurus for more information.
Othnielia is a genus of hypsilophodont dinosaur, named after its original describer, Professor Othniel Charles Marsh, an American paleontologist of the 19th century. The taxon, Othnielia rex, was named by Peter Galton in 1977 from a species Marsh (1877) called Nanosaurus rex.[1][2]
Remains assigned to Othnielia have been found in Wyoming, Utah, and Colorado in rocks of the Late Jurassic age (Oxfordian-Tithonian) Morrison Formation,[3] but with Galton's 2006 revision of Morrison ornithischians, the only definite remains are YPM 1875 (the holotype femur of "Nanosaurus" 'rex') and possibly some other associated postcranial bits. He considered the femur undiagnostic and thus Othnielia to be a dubious name, and removed two partial skeletons to the new genus Othnielosaurus.[4] It remains to be seen if this will be widely accepted, but this sort of taxonomic decision has much precedent (for example, Marasuchus versus Lagosuchus).
Without the remains now included in Othnielosaurus, this animal is dubious, and can only be described in generalities based on similar animals: small (~1.5-2 meters (4.5-6 feet) long, ~10 kilograms (22 pounds) in weight), agile bipedal herbivore with proportionally small arms and long legs.[3] Animals of this genus were included in the novel Jurassic Park as "othys", tree-climbing small herbivores, although there is no evidence for this kind of behavior.
[edit] Other specimens
Only the original holotype of Othnielia and two partial skeletons were specifically dealt with in Galton's paper, leaving unsettled the assignment of several other specimens that have appeared in the literature. Included among these are a nearly complete specimen in the Aathal Museum nicknamed "Barbara" is probably referable,[5][6] as well as some juvenile remains (DMNH 21716, a partial skeleton tentatively referred by Brill and Carpenter [2001] to Othnielia rex)[7] and a dentary (MWC 5822, again referred to O. rex).[8] Skeletons identified as Othnielia are also on display at the Denver Museum of Nature and Science.
[edit] References
- ^ Marsh, O.C. (1877). Notice of new dinosaurian reptiles from the Jurassic formations. American Journal of Sciences (Series 3) 14:514-516.
- ^ Galton, P.M. (1977). The ornithopod dinosaur Dryosaurus and a Laurasia-Gondwanaland connection in the Upper Jurassic. Nature 268: 230-232.
- ^ a b Foster, J.R. (2003). Paleoecological Analysis of the Vertebrate Fauna of the Morrison Formation (Upper Jurassic), Rocky Mountain Region, U.S.A. New Mexico Museum of Natural History and Science Bulletin 23.
- ^ Galton, P.M. (2006). Teeth of ornithischian dinosaurs (mostly Ornithopoda) from the Morrison Formation (Upper Jurassic) of the western United States. in: Carpenter, K. (ed.). Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press: Bloomington, 17-47. ISBN 0-253-34817-X.
- ^ Glut, Donald F. (2006). "Dinosaurs: The Encyclopedia, Supplement 4": p. 206. Jefferson, North Carolina: McFarland & Company, Inc..
- ^ Scott Hartman. othnielia. Retrieved on 2007-01-25.
- ^ Brill, K.; and Carpenter, K. (2001). "A baby ornithopod from the Morrison Formation of Garden Park, Colorado", in Tanke, D.H.; and Carpenter, K. (eds.): Mesozoic Vertebrate Life. Bloomington and Indianapolis: Indiana University Press, 197-205. ISBN 0-253-33907-3.
- ^ Pierce, R.J. (2006). "A nearly complete dentary of the ornithopod dinosaur Othnielia rex from the Morrison Formation of Wyoming", Paleontology and Geology of the Upper Jurassic Morrison Formation, New Mexico Museum of Natural History and Science Bulletin, 36. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science, 163-164.
[edit] External links
- Othnielia on Thescelosaurus!
