SVP Dinosaur News Release


Lawrence M. Witmer, PhD Professor of Anatomy Chang Ying-Chien Professor of Paleontology OU Presidential Research Scholar 2004-2009 Dept. of Biomedical Sciences Heritage College of Osteopathic Medicine Life Science Building, Rm 123 Ohio University Athens, Ohio 45701 USA Email: witmerL@ohio.edu

Media resources for the Evans, Witmer, Ridgely, and Horner news release on duck-billed dinosaur brains and crests

News Release from Ohio University:

Brain structure provides the key to unraveling the function of bizarre dinosaur crests
High-tech imaging reveals inner structure of duck-billed dinosaur skulls

ATHENS, Ohio (Oct. 9, 2008) — Paleontologists have long debated the function of the strange, bony crests on the heads of the duck-billed dinosaurs known as lambeosaurs. The structures contain incredibly long, convoluted nasal passages that loop up over the tops of their skulls.

Scientists at the University of Toronto, Ohio University and Montana State University now have used CT-scanning to look inside these mysterious crests and reconstruct the brains and nasal cavities of four different lambeosaur species. At the annual meeting of the Society for Vertebrate Paleontology in Cleveland, Ohio, on Oct. 16, the team will present new study findings that suggest the crests were used for communication.

“The shape of the brain can tell us a lot about what senses were important in a dinosaur’s everyday life, and give insight into the function of the crests,” said study lead author David Evans, a paleontologist at the Royal Ontario Museum and the University of Toronto.

Some paleontologists have suggested that the crests heightened the sense of smell by increasing the surface area of the sensory tissue. Others have argued that they regulated temperature, and still others have speculated that the crests acted as sound resonators for communication.

“It’s difficult to infer the function of structures in an extinct dinosaur when there is so little resemblance to any living animal,” said Jack Horner, a member of the team and paleontologist at Montana State University.

By using and analyzing CT scans, conducted by Lawrence Witmer and Ryan Ridgely of Ohio University’s College of Osteopathic Medicine, the scientists were able to circumvent the problems of fossilization.

“Even though the soft tissues are not preserved in the fossils, the shape of the bones that encase the brain and nasal passages are,” said Evans. “From there, the anatomy of these missing soft parts is easily interpreted.”

The CT scan results revealed a mismatch between the external shape of the crest (which no doubt functioned as a visual display) and the internal shape of the nasal passages in closely related species, suggesting a special function for the nasal cavity. The portion of the brain responsible for the sense of smell was relatively small and primitive, indicating that the crest did not evolve to improve that sense.

Computer models done by other researchers suggest that the crests could have been used to make low, eerie bellowing calls that could have been used in communication, perhaps to call for mates or warn others of predators. The CT scans documented a delicate inner ear that confirms that the dinosaurs could hear the low-frequency calls produced by the crest.

“We were surprised to see just how large the centers of the brain associated with higher cognitive functions were,” said Witmer, Chang Professor of Paleontology in Ohio University’s College of Osteopathic Medicine . “We suspected that the crested duck-billed dinosaurs used both vocal and visual displays, but now we see that they had the brain power and hearing to pull off these behaviors.”

When all the available information is put together, including the digital brain and ear casts, the evolutionary relationships of the species, and the growth pattern of the crest and its high degree of variability in different co-existing species, it supports the idea that the elaborate nasal cavity was likely used to produce sounds for communication. This study demonstrates the power of using an integrated approach combining 3D imaging, growth studies, and phylogenetic sampling to test ideas about the function and evolution of unusual structures in extinct animals.

The research was funded by the National Science and Engineering Research Council of Canada and the National Science Foundation. This study also will be published in part in an upcoming issue of the journal The Anatomical Record .

Contact: David Evans can be contacted at: davide@rom.on.ca , Ph: 416-586-5753; Lawrence Witmer can be contacted at witmerL@ohio.edu , Ph: 740-593-9489.

Download news releases (Word docs)
• Ohio University release • Society of Vertebrate Paleontology release
Download SVP Conference Abstract
Animation
Animation: Skulls of a juvenile and subadult Corythosaurus fade to reveal the brain and nasal passages within. The complicated nasal passage within the showy crest functioned as resonating chambers during vocalization. The structure of the inner ear and expanded brain confirms that duck-billed dinosaurs were capable of perhaps sophisticated behavioral communication. • Download a 5 MB QuickTime version (490x276) • Download a 16 MB QuickTime version (891x501) • Download a 73 MB QuickTime version (HD: 1920x1080) • Contact Witmer for the Flash animation

Graphics
Image 1. The diversity of crests in the lambeosaurine dinosaurs Parasaurolophus , Corythosaurus , and Lambeosaurus . Courtesy of Michael Skrepnick.
Image 2. A life reconstruction of the helmet-crested lambeosaur Corythosaurus . Courtesy of Michael Skrepnick.
Image 3. Reconstructions of the skull in a juvenile and sub-adult Corythosaurus created using CT scanning. The nasal cavity is highlighted in green, and the brain appears in purple. The complicated nasal passage within the showy crest functioned as resonating chambers during vocalization. The structure of the inner ear and expanded brain confirms that duck-billed dinosaurs were capable of perhaps sophisticated behavioral communication. Unlabeled and labeled versions are provided. Courtesy of Witmer & Ridgely, Ohio University.