Understanding food chains in ancient ecosystems is one of the goals of paleoecology. Direct evidence of these interactions is rare and includes fossils with stomach contents and bite/teeth marks. A rare occurrence of bite marks on the neck vertebrae of a giant azhdarchyd goat larval vertebral column specimen from the Greater Sublineage of Alberta, Canada. was recorded. Approximately 76 million years ago. Based on the size and shape of the tooth marks and comparisons with modern animals, the authors suggest that crocodiles bite pterosaurs, but it is unclear whether this is active predation or scavenging. I couldn’t do it. Signs of giant pterosaurs are rare, so this provides novel details about how they fit into this ancient ecosystem.
Fossilized neck bones of a young boy Cryodrakon Boreas It shows signs (right part of specimens 2 and 8) that do not indicate that it was bitten by a crocodile-like creature 76 million years ago. Image credit: Brown et al. , doi:10.1017/jpa.2024.12.
The 76-million-year-old neck vertebrae were excavated in July 2023 in the Dinosaur Park Formation in Alberta, Canada.
The preserved (i.e. incomplete) length of the specimen is 5.8 cm. The estimated total length of the vertebrae is 9.4 cm.
The specimen has a circular puncture mark 4 mm wide from a crocodile tooth.
“Peterosaurus bones are very delicate, so it's very unusual to find fossils that were clearly chewed by another animal,” said Dr Caleb Brown, a palaeontologist at the Royal Tyrrell Museum of Paleontology. states.
“This specimen is even rarer because it is a juvenile.”
The punctured vertebrae belong to a larva (estimated wingspan 2 m) Cryodrakon Boreasa species of giant azhdarchid pterosaur that lived during the Late Cretaceous in what is now Canada.
Adults of this species will be as tall as a giraffe with a wingspan in an area of 10 m.
“With an estimated wingspan comparable to some of the largest azhdarchids, creedracon And other large azhdarchids were probably significant terrestrial foragers,” said the paleontologist.
“Bite marks, implanted teeth, and stomach contents indicate that the azhdarchid pterosaurs were fed by velociraptrines and crocodiles.”
Cryodrakon Boreas. Image credit: David Maas.
In this study, they used micro-CT scans and comparisons with other pterygoid bones to confirm that they were the result of an actual crocodile bite, rather than fossilization or damage during excavation. I did.
“It helps document species interactions from this time,” said Dr. Brian Pickles, a paleontologist at Reading College.
“While we can't say whether the palace was alive or dead when it was bitten, the specimen is a juvenile that crocodiles sometimes preyed on in prehistoric Alberta more than 700 million years ago, or removed.” It shows that it shows a pterosaur.”
study Published online today Journal of Paleontology.
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Caleb M. Brown et al. Larval vertebral vertebrae with putative crocodile bites from a Campanian in Alberta, Canada. Journal of Paleontologypublished online on January 23, 2025. doi:10.1017/jpa.2024.12
Source: www.sci.news
