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A large fossil reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest.
- ‘All groups of pelycosaurs went extinct by the end of the Permian.’
- ‘Nevertheless these primitive animals were more advanced on the road the to mammalian evolution, and, like the pelycosaurs, diverged along several lines as herbivores, carnivores, or omnivores.’
- ‘A characteristic pelycosaur was Dimetrodon, a large predator from the Permian of Texas.’
- ‘The transition between pelycosaurs and therapsids has not been documented.’
- ‘It may be intermediate in structure between the pelycosaurs and the therapsids.’
- ‘Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.’
- ‘Whereas the Early Permian pelycosaur record is extensive, Carboniferous pelycosaur remains are rare and poorly known.’
- ‘This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups.’
- ‘An interesting example of convergent evolution is seen between these pelycosaurs and the unrelated dinosaurs.’
- ‘It is a box-like construction, more like a pelycosaur than a mammal, with the large flat maxillae forming the sides, the nasal the top, the the tall premaxilla at the rostral end.’
Late 19th century: from Greek pelux, peluk- bowl + sauros lizard.
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