| | Scientific American: Feature Article: Rulers of the Jurassic Seas: December 2000 |
 | | Given the configurations of the skull and limbs, my colleagues and I think that ichthyosaurs branched off from the rest of the diapsids near the separation of two major groups of living reptiles, lepidosaurs (such as snakes and lizards) and archosaurs (such as crocodiles and birds). |
 | | Most important, the bones of fish-shaped ichthyosaurs are closely packed--without skin in between--to form a solid panel.Having all the toes enclosed in a single envelope of soft tissues would have enhanced the rigidity of the flippers, as it does in living whales, dolphins, seals and sea turtles. |
 | | Many characteristics of ichthyosaurs--including the shape of their bodies and backbones, the size of their eyes, their aerobic capacity, and their habitat and diet--seem to have changed in a connected way during their evolution, although it is not possible to judge what is the cause and what is the effect. |
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