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Theropsida |
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Theropsida [thi′räp·səd·ə] (paleontology) An order of extinct mammallike reptiles in the subclass Synapsida. 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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| The synapsid that was the dominant vertebrate after the end-Permian mass extinction, as described in "Lire on the edge" (SN: 9/15/01), was a reptile 1. This single genus of synapsid, a mammal-like reptile, populated much of Earth for 5 million years. |
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