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Research unearths new dinosaur species
Date:2/28/2013

baby dinosaurs are either coming out of a nesting grounds or out somewhere on their own, they are normally having to worry about the theropod dinosaurs, the things like raptors or, on bigger scales, the T. rex. So this kind of adds a new dimension," Boyd said. "You had your dominant riverine carnivores, the crocodyliforms, attacking these herbivores as well, so they kind of had it coming from all sides."

Based on teeth marks left on bones and the large amounts of fragments left behind, it is believed the crocodyliforms were also diminutive in size, perhaps no more than 2 meters long. A larger species of crocodyliform would have been more likely to gulp down its prey without leaving behind traces of "busted up" bone fragments.

Until now, paleontologists had direct evidence only of "very large crocodyliforms" interacting with "very large dinosaurs."

"It's not often that you get events from the fossil record that are action-related," Boyd explained. "While you generally assume there was probably a lot more interaction going on, we didn't have any of that preserved in the fossil record yet. This is the first time that we have definitive evidence that you had this kind of partitioning, of your smaller crocodyliforms attacking the smaller herbivorous dinosaurs," he said, adding that this is only the second published instance of a crocodyliform tooth embedded in any prey animal in the fossil record.

"A lot of times you find material in close association or you can find some feeding marks or traces on the outside of the bone and you can hypothesize that maybe it was a certain animal doing this, but this was only the second time we have really good definitive evidence of a crocodyliform feeding on a prey animal and in this case an ornithischian dinosaur," Boyd said.

The high concentrations of tiny dinosaur bones led researchers to conclude a type of selection occurred, that crocodyliforms were preferentially feeding on th
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Contact: Fran LeFort
Fran.LeFort@sdsmt.edu
605-394-6082
South Dakota School of Mines and Technology
Source:Eurekalert  

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