| 释义 |
Definition of pelycosaur in English: pelycosaurnoun ˈpɛlɪkəsɔːˈpelikəˌsôr 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. Order Pelycosauria, subclass Synapsida: several families and genera, including Dimetrodon and Edaphosaurus Example sentencesExamples - Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.
- The transition between pelycosaurs and therapsids has not been documented.
- Whereas the Early Permian pelycosaur record is extensive, Carboniferous pelycosaur remains are rare and poorly known.
- 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.
- An interesting example of convergent evolution is seen between these pelycosaurs and the unrelated dinosaurs.
- A characteristic pelycosaur was Dimetrodon, a large predator from the Permian of Texas.
- It may be intermediate in structure between the pelycosaurs and the therapsids.
- This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups.
- 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.
Origin Late 19th century: from Greek pelux, peluk- 'bowl' + sauros 'lizard'. Definition of pelycosaur in US English: pelycosaurnounˈpelikəˌsôr A large extinct reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest. Order Pelycosauria, subclass Synapsida: several families and genera, including Dimetrodon and Edaphosaurus Example sentencesExamples - Whereas the Early Permian pelycosaur record is extensive, Carboniferous pelycosaur remains are rare and poorly known.
- An interesting example of convergent evolution is seen between these pelycosaurs and the unrelated dinosaurs.
- It may be intermediate in structure between the pelycosaurs and the therapsids.
- A characteristic pelycosaur was Dimetrodon, a large predator from the Permian of Texas.
- 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.
- The transition between pelycosaurs and therapsids has not been documented.
- 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.
- Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.
- This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups.
- All groups of pelycosaurs went extinct by the end of the Permian.
Origin Late 19th century: from Greek pelux, peluk- ‘bowl’ + sauros ‘lizard’. |