:: : I think Algebraist is referring to " 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 . " from the article, which was there at the time you posted from what I can tell talk ) 11 : 50, 2 April 2008 ( UTC)
