Centrosaurines
Centrosaurinae
Summary 3
Centrosaurinae (Greek: pointed lizards) is a subfamily of ceratopsid dinosaurs, a group of large quadrupedal ornithiscians. Centrosaurinae was named by paleontologist Lawrence Lambe in 1915, with Centrosaurus as the type genus. The centrosaurines are further divided into three tribes: the Nasutoceratopsini, the Centrosaurini, and the Pachyrhinosaurini by Ryan et al (2016).[1] Nasutoceratopsins are defined as centrosaurines closer to Nasutoceratops titusi than to Centrosaurus apertus and centrosaurins are defined as centrosaurines (more specifically eucentrosaurans) closer to Centrosaurus apertus than to Pachyrhinosaurus canadensis. The only division used up until then was Pachyrhinosaurini which was defined as centrosaurines closer to Pachyrhinosaurus canadensis than to Centrosaurus apertus. Centrosaurine fossil remains are known primarily from the northern region of Laramidia (modern day Alberta, Montana, and Alaska) but isolated taxa have been found in China and Utah as well.[2] Defining features of centrosaurines include a large nasal horn, short supratemporal horns, and an ornamented frill projecting from the back of the skull.[3] With the exception of Centrosaurus apertus, all adult centrosaurines have spike-like ornaments midway up the skull.[4] Morphometric analysis shows that centrosaurines differ from other ceratopsian groups in skull, snout, and frill shapes.[5] There is evidence to suggest that male centrosaurines had an extended period of adolescence and sexual ornamention did not appear until adulthood.[3]
Fontes e Créditos
- (c) Ian Crowther, alguns direitos reservados (CC BY-NC), https://www.flickr.com/photos/ian_crowther/5753625946/
- (c) calgaryzoo, todos os direitos reservados
- Adaptado por calgaryzoo de uma obra de (c) Wikipedia, alguns direitos reservados (CC BY-SA), https://en.wikipedia.org/wiki/Centrosaurinae
