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Siats, new allosauroid theropod from Late Cretaceous of Utah



From: Ben Creisler
bcreisler@gmail.com



A new dinosaur online in Nature Communications:


Lindsay E. Zanno & Peter J. Makovicky (2013)
Neovenatorid theropods are apex predators in the Late Cretaceous of
North America
Nature Communications 4, Article number: 2827
doi:10.1038/ncomms3827
http://www.nature.com/ncomms/2013/131122/ncomms3827/full/ncomms3827.html

Allosauroid theropods were a diverse and widespread radiation of
Jurassic–Cretaceous megapredators. Achieving some of the largest body
sizes among theropod dinosaurs, these colossal hunters dominated
terrestrial ecosystems until a faunal turnover redefined apex predator
guild occupancy during the final 20 million years of the Cretaceous.
Here we describe a giant new species of allosauroid – Siats meekerorum
gen. et sp. nov. – providing the first evidence for the cosmopolitan
clade Neovenatoridae in North America. Siats is the youngest
allosauroid yet discovered from the continent and demonstrates that
the clade endured there into the Late Cretaceous. The discovery
provides new evidence for ecologic sympatry of large allosauroids and
small-bodied tyrannosauroids. These data support the hypothesis that
extinction of Allosauroidea in terrestrial ecosystems of North America
permitted ecological release of tyrannosauroids, which went on to
dominate end-Cretaceous food webs.

**
Supplementary information is free.


==
Here are a number of news story. Yesterday a few of media sources
published stories with the name, but it's possible they broke an
embargo so I held off in posting the stories. It's all official today.

http://www.chicagotribune.com/entertainment/chi-new-dinosaur-siats-meekerorum-discovered-20131121,0,4656361.story

http://news.nationalgeographic.com/news/2013/11/131122-dinosaur-carnivore-rex-predator-science-paleontology-utah/


 
http://www.charlotteobserver.com/2013/11/21/4486853/nc-chicago-scientists-announce.html