NOUN
- large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America
How To Use pelycosaur In A Sentence
- Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.
- Pelycosaurs and therapsids are two different orders of reptiles.
- Pelycosaur, therapsid, and mammal represent three evolutionary grades in a single progressive evolutionary axis.
- 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.
- 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.
- The earliest occurring and phylogenetically most primitive synapsids are the ‘pelycosaurs’ of traditional terminology.
- These basal forms evolved through the primitive pelycosaur stage, to the therapsids or mammal-like reptiles, and finally the mammals themselves.
- An interesting example of convergent evolution is seen between these pelycosaurs and the unrelated dinosaurs.
- Indeed, most workers recognized a geographical and temporal gap between Permo-Carboniferous ‘pelycosaurs’ and therapsid synapsids.
