A turtle with eyes closer to the end of the head. Keeping only the nostrils and the eyes above the water surface.
Turtles are broken down into two groups, according to how they evolved a solution to the problem of withdrawing their neck into their shell (something the ancestral
Proganochelys could not do): the
Cryptodira, which can draw their neck in while contracting it under their spine; and the
Pleurodira, which contract their neck to the side.
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