Tags

Type your tag names separated by a space and hit enter

Endocranial anatomy of lambeosaurine hadrosaurids (Dinosauria: Ornithischia): a sensorineural perspective on cranial crest function.
Anat Rec (Hoboken). 2009 Sep; 292(9):1315-37.AR

Abstract

Brain and nasal cavity endocasts of four corythosaurian lambeosaurines (Dinosauria: Ornithischia) were investigated to test hypotheses of cranial crest function related to sensorineural systems. Endocasts were generated through computed tomography and three-dimensional rendering and visualization software. The sample comprises a range of ontogenetic stages from the taxa Lambeosaurus, Corythosaurus, and Hypacrosaurus. Results show that the morphology of brain endocasts differs little from that of hadrosaurines. The strikingly convoluted nasal vestibule of Hypacrosaurus altispinus, when interpreted in the context of lambeosaurine phylogeny, suggests selective pressure for nasal cavity function independent from changes in the external shape of the crest and associated visual display function. The plesiomorphically small olfactory bulbs and apparently small olfactory region of the nasal cavity argues against the hypothesis that increased olfactory acuity played a causal role in crest evolution. The elongate cochlea of the inner ear reveals that hearing in lambeosaurines emphasized low frequencies consistent with the hypothesized low-frequency calls made by the crests under the resonation model of crest function. The brain is relatively large in lambeosaurines compared with many other large dinosaurs, and the cerebrum is relatively larger than that of all non-hadrosaurian ornithischians and large theropods, but compares favorably with hadrosaurine hadrosaurids as well as some maniraptoran theropods. It is concluded that the large brains of lambeosaurines are consistent with the range of social behaviors inferred when the crest is interpreted as an intraspecific signaling structure.

Authors+Show Affiliations

Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada. davide@rom.on.caNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19711466

Citation

Evans, David C., et al. "Endocranial Anatomy of Lambeosaurine Hadrosaurids (Dinosauria: Ornithischia): a Sensorineural Perspective On Cranial Crest Function." Anatomical Record (Hoboken, N.J. : 2007), vol. 292, no. 9, 2009, pp. 1315-37.
Evans DC, Ridgely R, Witmer LM. Endocranial anatomy of lambeosaurine hadrosaurids (Dinosauria: Ornithischia): a sensorineural perspective on cranial crest function. Anat Rec (Hoboken). 2009;292(9):1315-37.
Evans, D. C., Ridgely, R., & Witmer, L. M. (2009). Endocranial anatomy of lambeosaurine hadrosaurids (Dinosauria: Ornithischia): a sensorineural perspective on cranial crest function. Anatomical Record (Hoboken, N.J. : 2007), 292(9), 1315-37. https://doi.org/10.1002/ar.20984
Evans DC, Ridgely R, Witmer LM. Endocranial Anatomy of Lambeosaurine Hadrosaurids (Dinosauria: Ornithischia): a Sensorineural Perspective On Cranial Crest Function. Anat Rec (Hoboken). 2009;292(9):1315-37. PubMed PMID: 19711466.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Endocranial anatomy of lambeosaurine hadrosaurids (Dinosauria: Ornithischia): a sensorineural perspective on cranial crest function. AU - Evans,David C, AU - Ridgely,Ryan, AU - Witmer,Lawrence M, PY - 2009/8/28/entrez PY - 2009/8/28/pubmed PY - 2009/12/16/medline SP - 1315 EP - 37 JF - Anatomical record (Hoboken, N.J. : 2007) JO - Anat Rec (Hoboken) VL - 292 IS - 9 N2 - Brain and nasal cavity endocasts of four corythosaurian lambeosaurines (Dinosauria: Ornithischia) were investigated to test hypotheses of cranial crest function related to sensorineural systems. Endocasts were generated through computed tomography and three-dimensional rendering and visualization software. The sample comprises a range of ontogenetic stages from the taxa Lambeosaurus, Corythosaurus, and Hypacrosaurus. Results show that the morphology of brain endocasts differs little from that of hadrosaurines. The strikingly convoluted nasal vestibule of Hypacrosaurus altispinus, when interpreted in the context of lambeosaurine phylogeny, suggests selective pressure for nasal cavity function independent from changes in the external shape of the crest and associated visual display function. The plesiomorphically small olfactory bulbs and apparently small olfactory region of the nasal cavity argues against the hypothesis that increased olfactory acuity played a causal role in crest evolution. The elongate cochlea of the inner ear reveals that hearing in lambeosaurines emphasized low frequencies consistent with the hypothesized low-frequency calls made by the crests under the resonation model of crest function. The brain is relatively large in lambeosaurines compared with many other large dinosaurs, and the cerebrum is relatively larger than that of all non-hadrosaurian ornithischians and large theropods, but compares favorably with hadrosaurine hadrosaurids as well as some maniraptoran theropods. It is concluded that the large brains of lambeosaurines are consistent with the range of social behaviors inferred when the crest is interpreted as an intraspecific signaling structure. SN - 1932-8494 UR - https://www.unboundmedicine.com/medline/citation/19711466/Endocranial_anatomy_of_lambeosaurine_hadrosaurids__Dinosauria:_Ornithischia_:_a_sensorineural_perspective_on_cranial_crest_function_ L2 - https://doi.org/10.1002/ar.20984 DB - PRIME DP - Unbound Medicine ER -