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Homology of the neoceratopsian cervical bar elements

Published online by Cambridge University Press:  14 July 2015

Takanobu Tsuihiji  and
Peter J. Makovicky
Takanobu Tsuihiji
Affiliation:
Division of Amphibians and Reptiles, Department of Zoology
Peter J. Makovicky
Affiliation:
Department of Geology, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496,
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Extract

In neoceratopsian dinosaurs, the centra, neural arches, and neural spines of several anteriormost cervical vertebrae are fused together to form a structure called the cervical bar (Langston, 1975) or syncervical (Ostrom and Wellnhofer, 1986). This structure characterizes all neoceratopsians (Dodson and Currie, 1990; Dodson et al., 2004; You and Dodson, 2004) for which the anterior cervicals are known, but it remains controversial how many vertebrae are fused together to produce this structure, namely, whether it consists of the first three (atlas through the third cervical) or four (atlas through the fourth cervical) elements. Analyses of ceratopsian interrelationships have employed from two (Sereno, 1984; Chinnery, 2004) to five (Xu et al., 2002) characters related to the cervical bar; accordingly, sorting out the exact identities of the elements contributing to this structure may have implications for our understanding of support, branch lengths, and rates in ceratopsian evolution.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 81 , Issue 5 , September 2007 , pp. 1132 - 1138
Copyright
Copyright © The Paleontological Society 

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