Navigation Links
Brain structure provides key to unraveling function of bizarre dinosaur crests

ATHENS, Ohio (Oct. 16, 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 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.


Contact: Andrea Gibson
Ohio University

Related biology news :

1. Brain-nourishing molecule may predict schizophrenia relapse
2. Brainy genes, not brawn, key to success on mussel beach
3. Risk and reward compete in brain
4. Food for thought -- regulating energy supply to the brain during fasting
5. Millisecond brain signals predict response to fast-acting antidepressant
6. During exercise, the human brain shifts into high gear on alternative energy
7. Penn biophysicists create new model for protein-cholesterol interactions in brain and muscle tissue
8. International TGen-led team finds link between brain protein and Alzheimers disease
9. The satellite navigation in our brains
10. Arbor Vita and WRAIR sign CRADA for traumatic brain injury collaboration
11. Collaboration between researchers yields more comprehensive portrait of brain cancer
Post Your Comments:
Related Image:
Brain structure provides key to unraveling function of bizarre dinosaur crests
(Date:11/26/2015)... Research and Markets ( ) has announced the ... and Patent Infringement Risk Analysis" report to their ... Fingerprint sensors using capacitive technology represent a fast ... Idex forecasts an increase of 360% of the number ... the fingerprint sensor market between 2014 and 2017 (source ...
(Date:11/20/2015)... OXFORD, Connecticut , November 20, 2015 ... biometric authentication company focused on the growing mobile commerce ... its CEO, Gino Pereira , was recently interviewed ... The interview will air on this weekend on ... Bloomberg Latin America . --> NXTD ) ...
(Date:11/19/2015)... MOUNTAIN VIEW, Calif. , Nov. 19, 2015 /PRNewswire/ ... authentication market, Frost & Sullivan recognizes BIO-key with the ... Strategy Leadership. Each year, Frost & Sullivan presents this ... comprehensive product line catering to the needs of the ... which the product line meets and expands on customer ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... Oregon , November 25, 2015 ... Market Research Report is a professional and in-depth ... industry.      (Logo: ) ... overview of the industry including definitions, classifications, applications ... is provided for the international markets including development ...
(Date:11/24/2015)... Nov. 24, 2015  Asia-Pacific (APAC) holds the ... (CRO) market. The trend of outsourcing to low-cost ... but higher volume share for the region in ... however, margins in the CRO industry will improve. ... ( ), finds that the market ...
(Date:11/24/2015)... -- Cepheid (NASDAQ: CPHD ) today announced that ... and invited investors to participate via webcast. ... 1, 2015 at 11.00 a.m. Eastern Time --> ... 1, 2015 at 11.00 a.m. Eastern Time --> ... NY      Tuesday, December 1, 2015 at 11.00 ...
(Date:11/24/2015)... Nov. 24, 2015 /CNW/ - iCo Therapeutics ("iCo" or ... financial results for the quarter ended September 30, ... Canadian dollars and presented under International Financial Reporting ... ," said Andrew Rae , President ... iCo-008 are not only value enriching for this ...
Breaking Biology Technology: