Pterosaur discovery solves ancient feather mystery
An international team of paleontologists has discovered remarkable new evidence that pterosaurs, the flying relatives of dinosaurs, were able to control the color of their feathers using melanin pigments.
The study, published in the journal Nature, was led by University College Cork (UCC) paleontologists Dr. Aude Cincotta and Prof. Maria McNamara and Dr. Pascal Godefroit from the Royal Belgian Institute of Natural Sciences, with an international team of scientists from Brazil and Belgium.
The new study is based on analyses of a new 115-million-year-old fossilized headcrest of the pterosaur Tupandactylus imperator from north-eastern Brazil. Pterosaurs lived side-by-side with dinosaurs, 230 to 66 million years ago.
This species of pterosaur is famous for its bizarre huge headcrest. The team discovered that the bottom of the crest had a fuzzy rim of feathers, with short wiry hair-like feathers and fluffy branched feathers.
"We didn't expect to see this at all," said Dr. Cincotta. "For decades paleontologists have argued about whether pterosaurs had feathers. The feathers in our specimen close off that debate for good as they are very clearly branched all the way along their length, just like birds today."
The team then studied the feathers with high-powered electron microscopes and found preserved melanosomes—granules of the pigment melanin. Unexpectedly, the new study shows that the melanosomes in different feather types have different shapes.
"In birds today, feather color is strongly linked to melanosome shape," said Prof. McNamara. "Since the pterosaur feather types had different melanosome shapes, these animals must have had the genetic machinery to control the colors of their feathers. This feature is essential for color patterning and shows that coloration was a critical feature of even the very earliest feathers."
Thanks to the collective efforts of the Belgian and Brazilian scientists and authorities working with a private donor, the remarkable specimen has been repatriated to Brazil. "It is so important that scientifically important fossils such as this are returned to their countries of origin and safely conserved for posterity" said Dr. Godefroit. "These fossils can then be made available to scientists for further study and can inspire future generations of scientists through public exhibitions that celebrate our natural heritage."
More information: Maria McNamara, Pterosaur melanosomes support signalling functions for early feathers, Nature (2022). DOI: 10.1038/s41586-022-04622-3. www.nature.com/articles/s41586-022-04622-3
Journal information: Nature
Provided by University College Cork