Large eyeballs in diving ichthyosaurs. Motani, R. 2000. Rulers of the Jurassic seas. Scientific American has made this available on the Web . Rieppel, O. 1999.
Turtles are diapsids.
More Technical Reading Buchholz, E. A. 2001. Swimming styles in Jurassic ichthyosaurs. Zardoya, R., and A. Meyer. Complete mitochondrial genome suggests diapsid affinities of turtles. Last updated August 17, 2001.