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The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2] [3] approximately 66 million years ago. The event caused the extinction of all known non-avian dinosaurs.
Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5] Evidence suggests that it was semiaquatic; how capable it was of swimming has been strongly contested. Spinosaurus's leg bones had osteosclerosis (high bone density), allowing for better buoyancy control.
Some dinosaurs, e.g. Spinosaurus and Ouranosaurus, had on their backs "sails" supported by spines growing up from the vertebrae. (This was also true, incidentally, for the synapsid Dimetrodon.) Such dinosaurs could have used these sails to: take in heat by basking with the "sails" at right angles to the sun's rays.
Carnosauria is an extinct group of carnivorous theropod dinosaurs that lived during the Jurassic and Cretaceous periods.. While Carnosauria was historically considered largely synonymous with Allosauroidea, some recent studies have revived Carnosauria as clade including both Allosauroidea and Megalosauroidea (which is sometimes recovered as paraphyletic with respect to Allosauroidea), and thus ...
He in turn let it be described by Conybeare on 20 February 1824 in a paper read at the Geological Society of London, [16] during the same meeting in which for the first time a dinosaur was named, Megalosaurus. The two finds revealed the unique and bizarre build of the animals, in 1832 by Professor Buckland likened to "a sea serpent run through ...
Suchomimus itself was more adapted to a life hunting in shallow water due to its hollow bones, while Baryonyx and Spinosaurus were capable of fully submerging underwater and diving after prey. Courtesy of denser bones, the latter two spinosaurids could hunt underwater for prey and occupy a more derived lifestyle than Suchomimus could.
In 2020, a paper by Robert Smyth and colleagues assessing spinosaurines from the Kem Kem Group did not find the autapomorphies of Oxalaia quilombensis sufficient to warrant a separate taxon, but instead considered them a result of individual variation. The authors thus considered the species a junior synonym of Spinosaurus aegyptiacus.
Ornithischia (/ ˌ ɔːr n ə ˈ θ ɪ s k i. ə /) is an extinct clade of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds. [6] The name Ornithischia, or "bird-hipped", reflects this similarity and is derived from the Greek stem ornith-(ὀρνιθ-), meaning "bird", and ischion (ἴσχιον), [a] meaning "hip". [7]