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RE: Eodromaeus, new basal theropod from Triassic in Argentina



More info on Eodromaeus:
 
http://www.chicagotribune.com/news/chi-110113dinosaur-paul-sereno,0,7671360.story
 
Guy Leahy

----------------------------------------
> Date: Thu, 13 Jan 2011 19:38:07 -0200
> From: rmtakata@gmail.com
> To: bh480@scn.org
> CC: dinosaur@usc.edu
> Subject: Re: Eodromaeus, new basal theropod from Triassic in Argentina
>
> Wow, Eoraptor a Sauropodomorpha...
>
> []s,
>
> Roberto Takata
>
> On Thu, Jan 13, 2011 at 9:02 AM, wrote:
> > From: Ben Creisler
> > bh480@scn.org
> >
> > For anyone who was holding his/her breath, you can
> > breathe again. The paper is officially out, so if someone
> > else has not mentioned it yet:
> >
> > Ricardo N. Martinez, Paul C. Sereno, Oscar A. Alcober,
> > Carina E. Colombi, Paul R. Renne, Isabel P. Montañez and
> > Brian S. Currie (2011)
> > A Basal Dinosaur from the Dawn of the Dinosaur Era in
> > Southwestern Pangaea
> > Science 331 (6014): 206-210 (14 January 2011)
> > DOI: 10.1126/science.1198467
> > http://www.sciencemag.org/content/331/6014/206.abstract
> >
> > Abstract
> > Upper Triassic rocks in northwestern Argentina preserve
> > the most complete record of dinosaurs before their rise
> > to dominance in the Early Jurassic. Here, we describe a
> > previously unidentified basal theropod, reassess its
> > contemporary Eoraptor as a basal sauropodomorph, divide
> > the faunal record of the Ischigualasto Formation with
> > biozones, and bracket the formation with 40Ar/39Ar ages.
> > Some 230 million years ago in the Late Triassic (mid
> > Carnian), the earliest dinosaurs were the dominant
> > terrestrial carnivores and small herbivores in
> > southwestern Pangaea. The extinction of nondinosaurian
> > herbivores is sequential and is not linked to an increase
> > in dinosaurian diversity, which weakens the predominant
> > scenario for dinosaurian ascendancy as opportunistic
> > replacement.
> >
> > Also
> >
> > Michael Balter
> > Pint-Sized Predator Rattles The Dinosaur Family Tree
> > Science 331 (6014): 134 (14 January 2011)
> > DOI: 10.1126/science.331.6014.134
> > http://www.sciencemag.org/content/331/6014/134.short
> > Summary
> > On page 206 of this week's issue of Science, a team
> > working in Argentina reports the discovery of a very
> > early dinosaur—possibly a distant ancestor of
> > Tyrannosaurus rex—that lived about 230 million years ago,
> > during what paleontologists call the dawn of the
> > dinosaurs. The researchers say the new finds—two
> > specimens that together make up a nearly complete
> > skeleton of a diminutive, 1-meter-long dinosaur—and
> > neighboring fossils show that dinosaurs didn't outcompete
> > other reptiles, but rather gradually replaced them as
> > their predecessors died out for other reasons. More
> > controversially, the team says the fossils show that one
> > of the most well-known early dinosaurs, Eoraptor, long
> > considered an ancestor of meat eaters like T. rex, was
> > actually an ancestor of gigantic plant-eating dinosaurs
> > like Apatosaurus.
> >
> >
> > There's a cool video also at:
> >
> > http://news.discovery.com/videos/dinosaurs-dawn-runner-
> > sheds-light-on-dino-evolution.html
> >
> >
> >