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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, based on their hip structure. [2]
Dinosaurs are a diverse group of reptiles [note 1] of the clade Dinosauria. ... Labeled diagram of a typical archosaur skull, the skull of Dromaeosaurus.
The following outline is provided as an overview of and topical guide to dinosaurs: . Dinosaurs – diverse group of animals of the clade and superorder Dinosauria.They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period (about in 1963) until the end of the Cretaceous (2000), when the Cretaceous–Paleogene extinction event led to the extinction ...
Scale diagram comparing a human and the longest-known dinosaurs of five major clades An adult male bee hummingbird, the smallest known and the smallest living dinosaur. Size is an important aspect of dinosaur paleontology, of interest to both the general public and professional scientists.
Explanation: MWAK argued the diagram originally uploaded by Zureks (based on a Polish encyclopaedia) contains outdated views and also plain mistakes. We think this version is better in line with current cladistic views on Dinosaur evolution.. The original can be viewed here: Evolution of dinosaurs by Zureks.svg: . Modifications made by Woudloper.
Skull diagram of the basal sauropodomorph Massospondylus, showing the main skull openings (fenestra), including the external naris, the antorbital fenestra, the orbit, the infratemporal fenestra (here: lateral temporal fenestra), the supratemporal fenestra, and the mandibular fenestra. antorbital fenestra
Allosaurus (/ ˌ æ l ə ˈ s ɔːr ə s /) [1] [2] is an extinct genus of large carnosaurian theropod dinosaur that lived 155 to 145 million years ago during the Late Jurassic period (Kimmeridgian to late Tithonian ages). The name "Allosaurus" means "different lizard", alluding to its unique (at the time of its discovery) concave vertebrae.
Antarctosaurus (/ æ n ˌ t ɑːr k t oʊ ˈ s ɔːr ə s /; meaning "southern lizard") is a genus of titanosaurian sauropod dinosaur from the Late Cretaceous Period of what is now South America. The type species, Antarctosaurus wichmannianus, and a second species, Antarctosaurus giganteus, were described by prolific German paleontologist ...