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amniote |
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amniote [′am·nē‚ōt] (zoology) An animal that develops an amnion during its embryonic stage; includes birds, reptiles, and mammals. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Our evolutionary roots--the
amniota-began a great divergence when a few amniotes crawled out of a
primordial sea and left their finned relatives behind. It is
probable that this better means of expelling carbon dioxide allowed
these creatures to become fully independent from the water and
contributed to the development of the amniote egg, which was integral to
the transition from amphibian to reptile. Casineria pulls back the origin of amniote lineages much
farther than was previously realized. |
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