Search results
Results from the WOW.Com Content Network
The origin of ankylosaurs is poorly understood, and only a few specimens from the Middle Jurassic are known. [14] The ancestry of ankylosaurs has long been sought among stegosaurs, the closest group to ankylosaurs compared to other dinosaurs. Currently, ankylosaurs are a close group of stegosaurs within the Eurypoda clade. [15]
In both clades, the forelimbs were much shorter than the hindlimbs, particularly in stegosaurs. Thyreophora has been defined as the group consisting of all species more closely related to Ankylosaurus and Stegosaurus than to Iguanodon and Triceratops. It is the sister group of Cerapoda within Genasauria. [2]
The scale-like cranial ornamentation on the surfaces of ankylosaurs skulls is called "caputegulae", and were the result of remodeling of the skull itself. This obliterated the sutures between skull elements, which is common for adult ankylosaurs. The caputegulum pattern of the skull was variable between specimens, though some details are shared.
Ankylosauridae (/ ˌ æ ŋ k ɪ l oʊ ˈ s ɔː r ɪ d iː /) is a family of armored dinosaurs within Ankylosauria, and is the sister group to Nodosauridae.The oldest known ankylosaurids date to around 122 million years ago and went extinct 66 million years ago during the Cretaceous–Paleogene extinction event. [1]
Stegosauria is a group of herbivorous ornithischian dinosaurs that lived during the Jurassic and early Cretaceous periods.Stegosaurian fossils have been found mostly in the Northern Hemisphere (North America, Europe and Asia), Africa and possibly South America.
Stegosaurus (/ ˌ s t ɛ ɡ ə ˈ s ɔːr ə s /; [2] lit. ' roof-lizard ') is a genus of herbivorous, four-legged, armored dinosaur from the Late Jurassic, characterized by the distinctive kite-shaped upright plates along their backs and spikes on their tails.
Bohlin placed Stegosaurides in the Stegosauria. [1] However, later authors often presumed it represented a member of the Ankylosauria, in an indeterminate position. [2] The fossils resemble vertebrae of both groups in having strongly elevated diapophyses, but are more ankylosaur-like in that the neural arch is moderately tall.
Ankylosaurs (pictured) were first distinguished from stegosaurs in 1927 by Romer. 1924. Hennig described the distribution of Kentrosaurus bones in Quarry St at Tendaguru, Tanzania. He observed that at one place in the quarry multiple sacra were found near each other, while another area of the quarry contained limb bones, and yet another ...