Pelycosaur



[pel-i-kuh-sawr] /ˈpɛl ɪ kəˌsɔr/

noun
1.
any of a group of large primitive reptiles belonging to the extinct order Pelycosauria, abundant in North America and Europe during the Permian Period, often having a tall spinal sail.
/ˈpɛlɪkəʊˌsɔː/
noun
1.
any extinct mammal-like reptile of the order Pelycosauria, of Upper Carboniferous to Lower Permian times, from which the therapsids are thought to have evolved

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