March 08, 2012
An artist's recreation of Microraptor, a pigeon-sized, four-winged dinosaur that lived about 130 million years ago. Recent research has shown that the dinosaur had iridescent plumage. Image by: Jason Brougham/University of Texas.
"This study gives us an unprecedented glimpse at what this animal looked like when it was alive," said co-author Mark Norell, chair of the American Museum of Natural History's Division of Paleontology, in a statement. "While we've nailed down what color this animal was, even more importantly, we've determined that Microraptor, like many modern birds, most likely used its ornate feathering to give visual social signals."
Living around 120 million years ago, the species was first discovered in 2003 in China. It surprised scientists for what was viewed as the first "four-winged dinosaur" with feathers on both its fore and hind legs as well as a tail fan. While researchers have previously believed this plumage was related to flight, the current research team, including American and Chinese scientists, argue the magnificent tail feathers were more likely for display as is commonly seen in modern birds.
"Feather features were surely shaped by early locomotor styles. But, as any birder will tell you, feather colors and shapes may also be tied with complex behavioral repertoires and, if anything, may be costly in terms of aerodynamics," explains Julia Clarke, one of the paper's co-authors and an associate professor of paleontology at The University of Texas at Austin's Jackson School of Geosciences.
Researchers have been able to determine the color of a number of dinosaurs by analyzing the shape of melanosomes—the part of a cell that contains the pigment melanin—which has different structures for different colors. Microraptor had narrow melanosomes in stacked layers, which point to toward iridescent feathers.
"Iridescence is widespread in modern birds and is frequently used in displays. Our evidence that Microraptor was largely iridescent thus suggests that feathers were important for display even relatively early in their evolution," said Matt Shawkey, a co-author and associate professor of biology at the University of Akron.
The microraptor is in the dinosaur family of dromeosaurs, bird-like theropods that include such famous representatives as the velociraptor, all of which are believed now to be covered with feathers. The exact relationship between dromeosaurs and birds is still under debate.
CITATION: Q. Li, K.-Q. Gao, J.A. Clarke, J. Vinther, M.D. Shawkey, L. D’Alba, R. Pei, M. Ellison, M.A. Norell, J. Vinther. Reconstruction of Microraptor and the Evolution of Iridescent Plumage. Science. 2012.
This is a reconstruction of a Microraptor based on digital overlays of nine fossilized specimens. Microraptor was a pigeon-sized, four-winged dinosaur that lived about 130 million years ago. Image by: AMNH/M. Ellison.
This is a fossilized Microraptor specimen from the Beijing Museum of Natural History. Photo by: AMNH/M. Ellison.
An artist's recreation of Microraptor. Photo by: AMNH/M. Ellison.
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