Palaeontologists describe plant-eating dinosaur.
The new species, Jeyawati rugoculus, comes from rocks that preserve a swampy forest ecosystem that thrived near the shore of a vast inland sea 91 million years ago.
The dinosaur, whose name translates to mean "grinding-mouth, wrinkle-eye", was most likely an herbivore that ate the ferns and conifer trees found as fossils in the same rock layer.
A basal hadrosauroid, the find included partial skull bones, several vertebrae and fragments of the ribs.
Jeyawati is a close relative of the duck-billed hadrosaurs, which were abundant across the Northern Hemisphere for much of the Late Cretaceous Epoch, between 80 and 65 million years ago.
Jeyawati retains some primitive features of the teeth and jaws that preclude it from being a fully-fledged hadrosaur.eyawati is derived from two words in the language of the Zuni people, a Native American tribe located around the Zuni River in western New Mexico.
The name is a reference to the sophisticated chewing mechanism evolved by the herbivorous lineage to which Jeyawati belongs.
The second part of the name, rugoculus, comes from the Latin words ruga and oculus and means "wrinkle eye", describing a unique feature of the new species.
One of the bones that forms the eye socket exhibits a peculiar rough or wrinkly texture on its outer side, suggesting that Jeyawati rugoculus might have sported one or more large scales above and behind its eye.
Andrew T. McDonald, lead author of the study and a doctoral candidate in Penn's Department of Earth and Environmental Sciences, said: "Jeyawati apparently endured a hard life.
"Several of the rib fragments have a swollen, rough surface, indicating that the animal suffered broken ribs at some point in its life and that those injuries healed before the animal's death."
Although the fossil remains were discovered in 1996, it has only now been confirmed that the species is unique.
Jeyawati is a member of an assemblage of dinosaurs and other animals unknown as recently as 15 years ago.
McDonald began his classification of the find while a student at the University of Nebraska, before completing the work with Peter Dodson, professor of anatomy and palaeontology in the schools of Veterinary Medicine and Arts and Sciences at Penn.
"From looking at the more complete remains of species related to Jeyawati, we can make several assumptions," McDonald said, "including that the creature probably walked on all fours but was also capable of rearing up on two legs."
The bones now reside at the Arizona Museum of Natural History, where specimens of other dinosaurs uncovered in this region are also located.
The research team's findings appear in the May issue of the Journal of Vertebrate Palaeontology. (ANI)
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|Publication:||Asian News International|
|Date:||May 27, 2010|
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