Hagryphus

Taxobox|
name = "Hagryphus"


image_width = 260px
image_caption = "Hagryphu"s by Michael W. Skrepnick.
status = fossil
fossil_range = Late Cretaceous
regnum = Animalia
phylum = Chordata
classis = Sauropsida
superordo = Dinosauria
ordo = Saurischia
infraordo = Oviraptorosauria
genus = "Hagryphus"
binomial = "Hagryphus giganteus"
binomial_authority = Zanno & Sampson, 2005

"Hagryphus" ("Ha's griffin", from Egyptian "Ha", name of a god of the western desert and Greek "gryphus" meaning 'griffin' (a mythological bird-like creature); Zanno and Sampson, 2005) is an oviraptorosaurian theropod dinosaur from the Upper Cretaceous Period of what is now Utah. To date, only a single species is known, "H. giganteus". The holotype was discovered in the Kaiparowits Formation (Late Campanian) in the Grand Staircase-Escalante National Monument of southern Utah. Radiometric dating indicates that the beds where the specimen was found date to between 76 and 75 million years ago. Designated UMNH VP 12765, the type specimen resides in the collections of the Utah Museum of Natural History in Salt Lake City. It consists of an incomplete but articulated left manus and the distal portion of the left radius. Both the semilunate and radiale are preserved.

Other known species of North American oviraptorosaurs include "Elmisaurus rarus", "Microvenator celer", and "Chirostenotes pergracilis". This group of dinosaurs is better known from the Cretaceous of Asia, where forms such as "Khaan mckennai", "Conchoraptor gracilis" and "Oviraptor philoceratops" have been discovered.

Oviraptorosaurs are characterized by a shortened snout, massive endentulous jaws and extensively pneumatized skulls, often sporting elaborate crests, the function of which remains unknown. The toothless jaws may indicate a diet of eggs but these theropods likely fed on small vertebrates as well. Evidence suggests that they were feathered and some paleontologists consider them to be true birds (see the main article Oviraptorosauria for further information).

Size

As the species name indicates, "Hagryphus giganteus" was a particularly large oviraptorosaur, estimated to have been approximately 3 meters (10 ft) long, which makes it one of the largest members of the clade Oviraptorosauria (Barsbold, 1976). "H. giganteus" is estimated to be 30-40% larger than the next largest known North American oviraptorosaur, "Chirostenotes".

References

*Barsbold, R. 1976. [On a new Late Cretaceous family of small theropods (Oviraptoridae fam. n.) of Mongolia] . Doklady Akademii Nauk S.S.S.R. 226:685-688.
*Zanno, L. E. and Sampson, S. D. 2005. A new oviraptorosaur (Theropoda; Maniraptora) from the Late Cretaceous (Campanian) of Utah. Journal of Vertebrate Paleontology 25 (4):897-904, December 2005.

External links

* [http://www.cnn.com/2006/TECH/science/04/05/feathered.dinosaur.ap/index.html Article about "Hagryphus giganteus"] — CNN.
* [http://www.unews.utah.edu/p/?r=040306-2 University of Utah press release, "Giant Raptor Dinosaur Discovered in Utah Monument"]