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Newly identified Alberta dinosaur likely displayed its feathers to impress potential mates

Solving one of the longest cases of mistaken identity, University of Alberta PhD candidate Greg Funston recently described a new genus and species of toothless dinosaur from Alberta. Long thought to be a more common ornithomimid, Apatoraptor pennatus instead turned out to be a member of the notoriously enigmatic caenagnathid family.

Newly identified Alberta dinosaur likely displayed its feathers to impress potential mates
Apatoraptor likely would have waded through water like a heron, catching 
small prey with its beak and fingers and grazing on aquatic plants 
[Credit: Sydney Mohr]
"This is my first time naming a new dinosaur," says Funston of the prestigious honour. "It's really exciting on a personal level, but what I am most excited about is what it means for this field of paleontology. In future studies, it will help us to better understand these dinosaurs. It's a really important specimen."

The mostly complete skeleton was found in 1993, but because it was believed to be a more common ornithomimid, it sat on a shelf at the Royal Tyrrell Museum for 15 years before it was finally prepared for the museum's 25th anniversary. The mistaken identity laid the foundation for its name, meaning "deceptive thief."

The Apatoraptor pennatus fossil is the first articulated caenagnathid skeleton from anywhere in the world—meaning the bones are still in the same position as when the animal died—and is by far the most complete caenagnathid skeleton from Alberta. The discovery helps fill in some of the missing puzzle pieces on this elusive group of animals.

"Because it is a relatively complete skeleton, it helps resolve the relationships of caenagnathids, which have always been problematic," notes Funston. "Most caenagnathids are represented by isolated material or single bones, which means that we can't tell if they came from the same animal. Apatoraptor gives us a better idea of what these animals looked like, which tells us if the features we've been using to separate species are significant or not."

Feathers used for sexual display

With such a beautifully preserved fossil, the scientists were able to use CT scanning technology to fully examine the bones. They were surprised to find pits on an arm bone corresponding with feather scars. "These feather scars suggest that Apatoraptor had a wing of feathers on its arms, although it couldn't have used these wings to fly," says Funston. Instead, he explains, the wings were likely used for sexual display to attract mates.

"Oviraptorosaurs, the bigger group to which Apatoraptor and other caenagnathids belong, were probably some of the flashiest dinosaurs. We know of three separate ways—head crests, tail feathers and now arm feathers—that they would display to their mates."

Funston worked on the findings with his supervisor, world-renowned paleontologist Philip Currie, professor at the University of Alberta and Canada Research Chair in Dinosaur Paleobiology. He worked with his fellow grad student, paleoartist Sydney Mohr, on the life reconstruction. Mohr used modern birds as inspiration for the colouring.

"A new caenagnathid (Dinosauria: Oviraptorosauria) from the Horseshoe Canyon Formation of Alberta, Canada, and a reevaluation of the relationships of Caenagnathidae" appears in the April 14 edition of the Journal of Vertebrate Paleontology.

Author: Jennifer Pascoe | Source: University of Alberta [April 15, 2016]

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