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RE: Sclerotic rings
Mickey Rowe wrote:
> Andrews, K.D. (1996). "An endochondral rather than a dermal origin for
> scleral ossicles in Cryptodiran turtles", _Journal of Herpetology_,
> above claims ossicles in turtles develop by ossification of cartilage
> Nakamura, K. And Yamaguchi, H. (1991). "Distribution of scleral ossicles
> in Teleost fishes", _Memoirs of Faculty of Fisheries of Kagoshima
> University_, 40:1-20.
> (Looks at the distribution of ossicles in fish and finds they
> predominate in the eyes of fish like tuna which are large and fast-
> swimming. Suggests as Al Fraser did that differential pressure across
> the front of the eye required an evolutionary response.
Turtles and tuna? Doesn't this (deformation due to pressure) seem rather
contradictory as an explanation for ossicles, then?