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Pachycephalosaurus (/ ˌpækɪˌsɛfələˈsɔːrəs /; [2] meaning "thick-headed lizard", from Greek pachys-/παχύς- "thickness", kephalon/κεφαλή "head" and sauros/σαῦρος "lizard") [3] is a genus of pachycephalosaurid ornithischian dinosaur. The type species, P. wyomingensis, is the only known species, but some researchers ...
Description. Pachycephalosaurs were bipedal ornithischians characterized by their thickened skulls. They had a bulky torso with an expanded gut cavity and broad hips, short forelimbs, long legs, a short, thick neck, and a heavy tail. Large orbits and a large optic nerve point to pachycephalosaurs having good vision, and uncharacteristically ...
Dinosaurs are a diverse group of reptiles [note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research.
Classification of dinosaurs. Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria." [1] In 1887 and 1888 Harry Seeley divided dinosaurs into the two orders Saurischia and Ornithischia ...
Dreadnoughtus. Dreadnoughtus is a genus of titanosaurian sauropod dinosaur containing a single species, Dreadnoughtus schrani. D. schrani is known from two partial skeletons discovered in Upper Cretaceous (Campanian to Maastrichtian; approximately 76–70 Ma) rocks of the Cerro Fortaleza Formation in Santa Cruz Province, Argentina.
Appalachiosaurus (/ ˌ æ p ə ˌ l eɪ tʃ i oʊ ˈ s ɔːr ə s / AP-ə-LAY-chee-oh-SOR-əs; "Appalachian lizard") is a genus of tyrannosaurian theropod dinosaur from the Late Cretaceous period of what is now eastern North America.
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