Scientific classification
Dinosaurs, along with modern birds and crocodiles, belong to the primordial class. The skulls of the primordial dinosaurs had two holes, called temporal fenestrae, to provide the attachment of the jaw muscles, and an anorbital fenestra (anterior orbital hole) in front of the eye socket. Most reptiles and birds belong to the double bow; mammals and mammal-like reptiles have a temporal foramen, collectively known as single bows; turtles and early paraptiles, without temporal foramen, belong to bowless animals. Dinosaurs and other archosaurs share many tectonic features, such as teeth located in the coltan rather than extending directly from the jawbone. In the primordial dinosaurs, the most prominent feature of dinosaurs was their gait. The hind limbs of dinosaurs stand upright under the body, while the limbs of lizards and crocodiles are spread out on both sides.
Dinosaurs are often considered to be a general order, or an unlocated clade of evolution. Dinosaurs are divided into two broad orders: Saurischia and Ornithischia, distinguished by their pelvic structure. By definition, the range of the order Sauropods is: all dinosaurs that share a recent common ancestor with birds and a more distant common ancestor with ornithischia; ornithischia is all dinosaurs that have a recent common ancestor with Triceratops and a more distant common ancestor with the order Sauropods.
The sauropods mean "the hip joint of the lizard", and the pelvic pattern is relatively close to that of the early ancestors, with the pubic bone facing forward. The pubic bones of several biota evolved individually towards the rear, such as the lower order Ofer, the superfamily Scytheosaurus, the Chironidae, and its descendants birds. The order Sauropods consists of two main suborders: bipedal, mostly carnivorous theropods, and long-necked, four-legged, herbivorous sauropods. Certain sauropods evolved to be the ancestors of birds around the Time of jurassic.
Bird's hips, meaning "the hip joint of birds," have bird-like pelvic structures with the pubic bone facing posteriorly, but this is the result of convergent evolution. Unlike birds , the pubic bone of the bird's buttocks has an anterior protrusion. Ornithopods contain a variety of herbivores.
The following is a brief list of dinosaur families, most of which are extinct. Detailed dinosaur classification can be found in the dinosaur list.
Sauropodomorpha
Prosauropoda
Riojaronco Riojasauridae
Plateosauridae
Macrocephalus Massospondylidae
Sauropoda
Anchisauridae
Melanorosauridae
Blikanasauridae
Volcanic-toothed plesiosaurs Vulcanodontidae
Cetiosauridae
Omeisauridae
Turiaosaurus Turiasauria
Neo-sauropods Neosauropoda
Diplodocoidea
Macronaria, a large-nosed dragon
Camarasauridae
Brachiosauridae
Titan dragon class Titanosauria
Fabrosauridae
Panzer suborder Thyreophora
Scelidosauridae
Stegosaurus Stegosauria
Ankylosauria
Nodosauridae
Ankylosauridae
Cerapoda
Heterodontosauridae
Bird foot ornithopoda
Plesiosaurs Hypsilophodontidae
Iguanodontidae
Platypus superfamily Hadrosauroidea
Headdress dragon Marginocephalia
Pachycephalosauria
Ceratopsia
Psittacosauridae
Protoceratopsidae
Ceratopsidae
Brachiosaurus, a giant sauropod dinosaur
Different bird foot order dinosaurs