Dinosaur Feathers Found in Amber

Many outlets are reporting the find in Myanmar of perfectly-preserved dinosaur feathers in Amber.  From the Washington Post:

The amber hunters who dug up the segment in Burma (Myanmar) assumed the encased remains were vegetation, making the amber valuable when carved into jewelry. It probably did not occur to them that their discovery could be a dinosaur tail with secrets to tell. But a Chinese paleontologist named Xing Lida, perusing a Burmese amber market in 2015 for objects of scientific interest, recognized the amber’s true value.

“With the new specimen from Myanmar, we finally get that association between identifiable bones and feathers preserved in exquisite detail,” said Ryan McKellar of the Royal Saskatchewan Museum in Canada, a paleontologist and an author of the study, in an email to The Washington Post. Lida, McKellar and their Chinese and Canadian colleagues published an analysis of the tail on Thursday in the journal Current Biology.

How do we know it is from a dinosaur and not a bird?

X-ray images revealed that no ancient bird grew this tail. The tail tip belonged to a two-legged dinosaur called a theropod. “We can tell that this specimen came from a theropod dinosaur because the tail is flexible and the vertebrae articulate with each other, instead of being fused together to form a solid rod — which is a characteristic of modern birds and their closest relatives,” McKellar said. Specifically, the researchers hypothesized the animal was a type of dinosaur called a coelurosaur, and likely a juvenile.

Image Credit: A rendition of the coelurosaur. (Chung-tat Cheung and Yi Liu)

This further cements the link between the late Cretaceous theropods and early birds. More pieces of the puzzle.

More Feathered Dinosaurs

Science Daily has a story on the discovery of more feathered dinosaurs. From down in the story:

Theropods are bipedal, mostly carnivorous dinosaurs. In recent years, scientists have discovered that many extinct theropods had feathers. But this feathering has only been found in theropods that are classified as coelurosaurs, a diverse group including animals like T. rex and birds. Sciurumimus -- identified as a megalosaur, not a coelurosaur -- is the first exception to this rule. The new species also sits deep within the evolutionary tree of theropods, much more so than coelurosaurs, meaning that the species that stem from Sciurumimus are likely to have similar characteristics.

Once again, we are seeing that, in response to changing climate, some dinosaurs are evolving feathers to keep warm. The writer alludes to this at the end of the quote. It is likely that the ancestors of both branches of theropods will have rudimentary feathers. The coelurosaurs simply took it and ran with it.

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