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Dinosaur tooth wear sheds light on their predatory life



<a href = "https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hires/2018/dinosaurstoo.jpg" title = "This image shows a stitch-and-turn feeding in predatory Theropod dinosaurs, based on the results of the researchers' microanalysis and the finite element analysis, Source: Sydney Mohr / Current Biology ">
 Dinosaur tooth wear sheds light on their predator life
This figure shows puncture-feeding in predatory theropod dinosaurs, based on the results of the researchers' microanalysis and finite element analyzes. Credit: Sydney Mohr / Current Biology

Predatory, avian-like theropod dinosaurs from the Upper Cretaceous (1

00.5-66 million years ago) from Spain and Canada relied on a stinging and biting strategy to kill and consume their prey. But a close examination of the wear and modeling patterns of their serrated, blade-like teeth reported in Current Biology on April 26 also indicates that these dinosaurs were not necessarily in direct competition with their next meal , Some of them were obviously looking for bigger fighting prey, while others were looking for softer or smaller fare.

"All these dinosaurs lived at the same time and in the same place, so it is important to know if they are competing for food resources or if they are targeting different prey species," says Angelica Torices of the Universidad de La Rioja, Spain. "Through this work, we [can] begin to understand the interactions between these predatory dinosaurs in the ecosystem a little better.

" We find predatory coelo dinosaurs generally in the same way by a sting-and-pull But troodontids and dromaeosaurids may have preferred other prey, "she adds, noting that the troodontids apparently prefer lower bites compared to dromeosaurs.Coelaurosaurs include a group of theropod dinosaurs that are closer to birds than other dinosaurs, including The Allosaur (19659005) Torices has always been interested in the teeth of carnivorous dinosaurs, because first she wanted to associate tooth remains with the dinosaur species they came from, and over time she became curious about how different dinosaurs used their teeth. like that with certain tooth shapes and – gr and what she could learn about the life of dinosaurs.

<a href = "https: //3c1703fe8d.site.internapc dn.net/newman/gfx/news/hires/2018/1-dinosaurstoo.jpg" microwear pattern on the teeth of three theropods. Credit: Angelica Torices and Victoria Arbor / Current Biology ">
 Dinosaur tooth wear provides clues to their predatory life
Microhrear pattern on the teeth of three theropods. Image: Angelica Torices and Victoria Arbor / Current Biology

Torices first examined the micro-plane or pattern of small scratches on the teeth to see if they could detect any pattern in the way various dinosaurs feed on it. Together with colleagues, including Ryan Wilkinson of the University of Alberta, Canada, she also used a modeling approach called finite element analysis to solve problems in engineering and mathematical physics and to find out how the dinosaur's teeth behaved most often

Both approaches led to the same general conclusion, she says. All of the dinosaurs studied used a stitch-and-feed feeding motion that produced parallel scratches as they bite into the prey, followed by oblique scratches when the head was pulled back with the jaws closed, the researchers report. However, they found that the different tooth shapes were performed differently under a variety of simulated biting angles.

<a href = "https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hires/2018/2 -dinosaurstoo.jpg" title = "Different theropod dinosaurs, their teeth and their different tooth forms Teeth are scaled to the same height of the crown for comparison purposes Photo credit: Victoria Arbor / Current Biology ">
 The tooth wear of dinosaurs provides information about their predatory life
Various theropods, their teeth and their different tooth forms. All teeth are scaled to the same crown height for comparison. Credit: Victoria Arbor / Current Biology

Evidence suggests that Dromaeosaurus and Saurornithinestes were well-suited for treating prey prey or processing bones as part of their diet. By comparison, Troodon teeth were more likely to fail at difficult bite angles. The findings suggest that troodontids may have preferred softer prey such as invertebrates, smaller prey that may require a less powerful bite or be swallowed whole, or immobile prey such as carrion.

Torices says they are now working to develop more complex models, including teeth with their roots and pines to better understand the biting process.


Further information:
The dinosaur menu, as shown by calcium

Further information:
Current Biology Torices et al.: "Puncture-and-pull biomechanics in the teeth of predatory coelo dinosaurs" http://www.cell.com/current-biology/fulltext/S0960 -9822 (18) 30371-3, DOI: 10.1016 / j.cub.2018.03.042

Sources in Journal:
Current biology

Provided by:
cell Press


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