What Did Pterosaurs Eat? Look Very Carefully at Their Enamel

The pterosaurs had no approach of realizing it, however they might in the future grow to be a little bit of a headache for scientists. The flying reptiles lived alongside the dinosaurs between 210 million and 66 million years in the past, starting from the scale of a sparrow to the peak of a rattling giraffe within the case of Quetzalcoatlus northropi, whose wings stretched 33 feet.

In the event that they flew like birds however had been in truth reptiles, which group did they take after in relation to food plan? Paleobiologists typically look to residing animals for clues: A Komodo dragon, as an illustration, packs serrated tooth for slashing by flesh, whereas crocodilians use their peg tooth to know prey and swallow it entire. So regardless that the pterosaurs are lengthy gone, as we speak scientists can analyze the shapes of their skulls and tooth to recommend whether or not a sure species was prone to hunt bugs, fish, or the flesh of terrestrial animals.

Now, one group of researchers has a newfangled device for divining not solely what a pterosaur ate, however how that prey, in a way, bit again. It seems that chewing on totally different supplies creates attribute patterns of “microwear” on the tooth, on the dimensions of millionths of a meter. (The identical factor additionally occurs to your tooth, and to trendy reptiles like crocodiles and monitor lizards.) These patterns provide clues to an animal’s consuming habits.

Writing today within the journal Nature Communications, the researchers describe how they imaged the tooth of pterosaurs utilizing a elaborate know-how known as infinite focus microscopy, which measures in three dimensions. Then they in contrast the tooth to these of contemporary beasts, whose diets we all know in nice element. They discovered that between all of the species of pterosaurs they examined, there wasn’t a lot that the traditional animals didn’t eat, giving the scientists new insights that cranium and tooth morphology alone might by no means present. “We found carnivores, we found piscivores—fish eaters—and also invertebrate eaters,” says paleobiologist Jordan Bestwick of the College of Leicester and the College of Birmingham, lead creator on the brand new paper. “We found pterosaurs that might have been eating slightly softer insects, so a similar hardness to dragonflies and crickets, and then those who might have been eating more crunchy items along the vein of crabs, beetles, and snails.”

They may additionally see how the group’s dietary preferences modified all through tens of tens of millions of years of evolution, portray a extra vivid image of the roles pterosaurs performed in ecosystems everywhere in the world. The researchers even unraveled clues as to how a person pterosaur’s food plan might have modified because it grew up.

Previous to this new work, paleobiologists had a couple of methods of resolving the food plan of pterosaurs. For one factor, a couple of uncommon fossils have some gentle tissues preserved, so scientists can look inside their stomachs for bones and fish scales. Fossil pterosaur feces, often called coprolites, additionally assist. And the truth that so many pterosaur fossils are present in what had been as soon as coastal environments is a strong clue that they ate fish and different seafood.

However Bestwick and his colleagues might decide aside the pterosaur food plan like by no means earlier than due to the infinite focus microscope, which bombarded every pterosaur tooth with photons and measured how lengthy it took for them to return to the gadget. A photon hitting the underside of a groove within the tooth texture takes ever so barely longer than one hitting a peak. They then ran this knowledge by software program that engineers use to find out the smoothness of machined elements, giving them a quantitative measure of the roughness of pterosaur tooth.

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