HOME >> BIOLOGY >> NEWS
Revueltosaurus skeleton unearthed at Petrified Forest upsets dinosaur tale

Berkeley - The fossilized skeleton of a small crocodile relative excavated last year at Petrified Forest National Park in Arizona throws a wrench into theories of how and where the dinosaurs arose more than 210 million years ago at the end of the Triassic Period.

The animal, one of many creatures from the Late Triassic known only from their teeth, was thought to be an ancestor of the plant-eating ornithischian dinosaurs like Stegosaurus and Triceratops, which roamed the world millions of years later in the Jurassic and Cretaceous periods.

The fact that this presumed dinosaur, Revueltosaurus callenderi, is instead a crocodile ancestor does not merely disappoint rockhounds, who sell the abundant teeth as "dinosaur teeth," but it also throws into question the identity of other presumed dinosaur ancestors known only from teeth, which includes all Late Triassic ornithischians outside South America.

"Because the teeth look like those we know from herbivorous ornithischians, people assigned them to the dinosaurs," said Randall Irmis, a graduate student in the Department of Integrative Biology and the Museum of Paleontology at UC Berkeley. "We think we've shown that you can't rely on the dentition to determine what is an early dinosaur, which casts doubt on all the ornithischians from the Triassic of North America."

This suggests, he said, that the herbivorous ornithischians and the meat-eating theropods, like Tyrannosaurus rex, did not evolve together in the Late Triassic as many paleontologists thought. Rather, the theropods were well established worldwide before the ornithischians spread out into North America, Europe and Africa at the very end of the Triassic, perhaps from possible origins in South America.

"We have pretty much erased the record of Triassic ornithischian dinosaurs from North America, Europe and worldwide, except for South America," said the fossil's discoverer, park paleontologist William Parker. "Even the fossils
'"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
23-Jun-2005


Page: 1 2 3 4

Related biology news :

1. Research shows skeleton to be endocrine organ
2. Paleontologists discover most primitive primate skeleton
3. Anthropologist challenges species identification of ancient child skeleton found in Ethiopia
4. Oldest juvenile skeleton discovered will help piece together human development
5. Corals switch skeleton material as seawater changes
6. Penn researchers discover gene that creates second skeleton
7. UF scientists reveal ancient origin of vertebrate skeleton
8. Has science unearthed the Holy Grail of pain relief?
9. Forest elephants at risk from the illegal ivory trade
10. Colorado company to sell medical food products based on Wake Forest discovery
11. NSF awards Harvard Forest $4.9 million to study landscape change

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/19/2017)... 19, 2017 The global military ... is marked by the presence of several large global ... by five major players - 3M Cogent, NEC Corporation, ... for nearly 61% of the global military biometric market ... the global military biometrics market boast global presence, which ...
(Date:4/13/2017)... According to a new market research report "Consumer IAM Market by ... Service, Authentication Type, Deployment Mode, Vertical, and Region - Global Forecast to ... USD 14.30 Billion in 2017 to USD 31.75 Billion by 2022, at ... ... MarketsandMarkets Logo ...
(Date:4/11/2017)... NXT-ID, Inc. (NASDAQ:   NXTD ) ("NXT-ID" or ... independent Directors Mr. Robin D. Richards and Mr. ... the company,s corporate governance and expertise. ... Gino Pereira , Chief Executive Officer said," ... and benefiting from their considerable expertise as we move forward ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... 12, 2017 , ... BioMedGPS announces expanded coverage of SmartTRAK ... module, US Hemostats & Sealants. , SmartTRAK’s US Market for Hemostats and Sealants ... sealants and biologic sealants used in surgical applications. BioMedGPS estimates the market will ...
(Date:10/11/2017)... ... ... wash is a basic first aid supply for any work environment, but most personal eye ... first if a dangerous substance enters both eyes? It’s one less decision, and likely quicker ... eye piece. , “Whether its dirt and debris, or an acid or alkali, getting anything ...
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions ... over 5.5 million people each year. Especially those living in larger cities are affected ... based in one of the most pollution-affected countries globally - decided to take action. ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... ... Science Center’s FirstHand program has won a US2020 STEM Mentoring Award. Representatives of ... award for Excellence in Volunteer Experience from US2020. , US2020’s mission is to ...
Breaking Biology Technology:
Cached News: