1. A thin-shelled reptile from the Late Triassic of North America and the origin of the turtle shell by Walter G Joyce, Spencer G Lucas, Torsten M Scheyer, Andrew B Heckert, and Adrian P Hunt Proceedings B Volume 276(1656):507-513 February 7, 2009 ©2009 by The Royal Society

2. Illustrations of C. tenertesta, NMMNH P-16697. Walter G Joyce et al. Proc. R. Soc. B 2009;276:507-513 ©2009 by The Royal Society

3. Photographs of C. tenertesta, NMMNH P-16697. Walter G Joyce et al. Proc. R. Soc. B 2009;276:507-513 ©2009 by The Royal Society

4. A phylogenetic hypothesis of basal turtle relationships placed on a temporal scale. Walter G Joyce et al. Proc. R. Soc. B 2009;276:507-513 ©2009 by The Royal Society

5. The composite (‘gradual’) origin of the turtle shell with two hypothetical ancestors. Walter G Joyce et al. Proc. R. Soc. B 2009;276:507-513 ©2009 by The Royal Society