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1 March 2010 Anatomy of Condorchelys antiqua, and the Origin of the Modern Jaw Closure Mechanism in Turtles
Juliana Sterli, Marcelo S. De La Fuente
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Here we present a detailed anatomical description of cranial and post-cranial remains of a Jurassic turtle, Condorchelys antiqua Sterli, 2008, from the Cañadón Asfalto Formation (Middle Jurassic) in central Patagonia. Although C. antiqua is similar in morphology to the Early Jurassic turtles Kayentachelys aprix and Indochelys spatulata, it differs in that it lacks both pterygoid teeth and a V-shaped suprapygal 2, respectively. In light of new discoveries and reinterpretations of other fossil taxa, we suggest that several changes in the evolution of the skull morphology of turtles (such as the closure of the basipterygoid articulation, the closure of the interpterygoid vacuity, the development of the secondary lateral wall in the braincase, the development of temporal emargination and/or the posterior extension of the crista supraoccipitalis) could be related to the acquisition of a stronger skull to accommodate the modern pulley system. The optimization of these characters in a phylogenetic framework shows that they are coincident with the appearance of trochlear systems (oticum or pterygoidei) in turtles, suggesting a functionally correlated relationship among them.

© 2010 by the Society of Vertebrate Paleontology
Juliana Sterli and Marcelo S. De La Fuente "Anatomy of Condorchelys antiqua, and the Origin of the Modern Jaw Closure Mechanism in Turtles," Journal of Vertebrate Paleontology 30(2), 351-366, (1 March 2010).
Received: 3 December 2008; Accepted: 1 May 2009; Published: 1 March 2010

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