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Postcranial skeleton of Shinisaurus crocodilurus (Squamata: Anguimorpha)
1Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois 60637, USA. jlconrad@uchicago.edu
Journal of Morphology
|December 1, 2004
Summary
The postcranial skeleton of Shinisaurus crocodilurus, the Chinese crocodile lizard, is described with new details on its vertebrae and limb bones. This study clarifies anatomical discrepancies and provides insights into anguimorph evolution.
Area of Science:
- Paleontology
- Vertebrate Anatomy
- Evolutionary Biology
Background:
- The postcranial skeleton of Shinisaurus crocodilurus (Chinese crocodile lizard) is incompletely understood.
- Published descriptions of Shinisaurus anatomy contain discrepancies and inaccuracies.
Purpose of the Study:
- To provide a detailed description of the postcranial skeleton of Shinisaurus crocodilurus.
- To resolve discrepancies in existing literature.
- To compare Shinisaurus anatomy with extant anguimorphs to inform evolutionary hypotheses.
Main Methods:
- Detailed examination of complete Shinisaurus crocodilurus specimens.
- Comparative analysis with extant anguimorph taxa.
- Skeletal character state analysis.
Main Results:
- The axial skeleton typically has 26 or 27 presacral vertebrae, including eight cervical vertebrae.
- Specific features of the humerus, pelvis, and phalanges are described.
- Presence of sesamoids in the knee, elbow, and digits confirmed.
- A cartilaginous strut connects the clavicles and interclavicle.
- Mosasauroidea likely possessed eight or more cervical vertebrae.
Conclusions:
- The postcranium of Shinisaurus is relatively unspecialized within Anguimorpha.
- Shinisaurus can be accurately diagnosed by a unique combination of skeletal characters.
- The findings contribute to a better understanding of anguimorph diversity and evolution.