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Naturwissenschaften

, Volume 94, Issue 9, pp 769–778 | Cite as

Cranial pneumatization and auditory perceptions of the oviraptorid dinosaur Conchoraptor gracilis (Theropoda, Maniraptora) from the Late Cretaceous of Mongolia

  • Martin Kundrát
  • Jiří Janáček
Original Paper

Abstract

The distribution of air-filled structures in the craniofacial and neurocranial bones of the oviraptorid ZPAL MgD-I/95, discovered at the Hermiin Tsav locality, Mongolia, is restored. Based on the complete obliteration of most of the cranial sutures, the specimen is identified as an adult individual of Conchoraptor gracilis Barsbold 1986. Except for the orbitosphenoids and epipterygoids, the preserved bones of the neurocranium are hollow. Three types of tympanic recess are present in Conchoraptor, a characteristic shared with troodontids, dromaeosaurids, and avian theropods. The contralateral middle ear cavities are interconnected by the supraencephalic pathway that passes through the dorsal tympanic recesses, the posterodorsal prootic sinuses and the parietal sinus. The spatial arrangements of the middle ear cavity and a derived neurocranial pneumatic system in Conchoraptor indicate enhancements of acoustic perception in the lower-frequency registers and of auditory directionality. We further speculate that this improvement of binaural hearing could be explained as an adaptation required for accurate detection of prey and/or predators under conditions of low illumination. The other potentially pneumatic structures of the Conchoraptor cranium include (1) recessus-like irregularities on the dorsal surface of the nasal and frontal bones (a putative oviraptorid synapomorphy; pos); (2) a subotic recess; (3) a sub-condylar recess; and (4) a posterior condylar recess (pos).

Keywords

Theropoda Oviraptorosauria Conchoraptor Neurocranium Pneumatic sinus Acoustic perceptions Binaural hearing Directionality 

Notes

Acknowledgements

The authors thank Ole N. Larsen, Gareth Dyke, and Kevin Padian for reading and commenting on an earlier version of this manuscript, Gerald Mayr for his valuable editing and editorial comments, and Randy and Deb Lyons for their rigorous edit of the final version of the manuscript. Our special thanks to Halszka Osmólska and Teresa Maryańska for providing access to the fossil specimen and Zdeněk Seidl and Vladimír Smékal for providing access to the CT facility.

Supplementary material

114_2007_258_Fig1_ESM.jpg (408 kb)
Supplementary Fig. S1

Transversal CT-scan sections through the rostral part of the skull of Conchoraptor gracilis, ZPAL MgD-I/95 (JPG 662 kb)

114_2007_258_Fig2a_ESM.jpg (292 kb)
Supplementary Fig. S2

Transversal CT-scan sections through the anterior neurocranium of Conchoraptor gracilis, ZPAL MgD-I/95 (a)(JPG 436 kb) (b)(JPG 327 kb)

114_2007_258_Fig2b_ESM.jpg (251 kb)
Supplementary Fig. S2

Transversal CT-scan sections through the anterior neurocranium of Conchoraptor gracilis, ZPAL MgD-I/95 (a)(JPG 436 kb) (b)(JPG 327 kb)

114_2007_258_Fig3a_ESM.jpg (375 kb)
Supplementary Fig. S3

Transveral CT-scan sections through the posterior neurocranium of Conchoraptor gracilis, ZPAL MgD-I/95 (a)(JPG 578 kb) (b)(JPG 330 kb)

114_2007_258_Fig3b_ESM.jpg (254 kb)
Supplementary Fig. S3

Transveral CT-scan sections through the posterior neurocranium of Conchoraptor gracilis, ZPAL MgD-I/95 (a)(JPG 578 kb) (b)(JPG 330 kb)

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Redpath Museum-Biology DepartmentMcGill UniversityMontrealCanada
  2. 2.Institute of PhysiologyThe Academy of Sciences of the Czech RepublicPrague 4Czech Republic

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