SOUL

Kingdom: Animalia... Phylum: Chordata...Sub-Phylum: Vertebrata... Class: Sauropsida... Subclass: Diapsida... Order1: Hornithischia... Sub-order1: Cerapoda & Thyreophora... Order2: Saurischia... Sub-order1: Saudopodomorpha & Theropoda...

Dinosaurs were the dominant vertebrate animals of terrestrial ecosystems for over 160 million years, from the late Triassic period, which is about 230 million years ago, until the end of the Cretaceous period, about 65 million years ago. Then most of them became extinct in the Cretaceous–Tertiary extinction event. Research since the 1970s indicates that theropod dinosaurs are most likely the ancestors of birds; in fact, most paleontologists regard birds as the only surviving dinosaurs and some believe dinosaurs and birds should be put together under one biological class. Crocodilians are the other surviving close relatives of dinosaurs. 

MIND

The term Dinosauria was formally named in 1842 by English palaeontologist Richard Owen, who used it to refer to the "distinct tribe or sub-order of Saurian Reptiles" that were then being recognized in England and around the world. The term is derived from the Greek words δεινός, which is deinos, meaning "terrible", "fearsome", or "formidable". And σαύρα, which is saura, meaning "lizard" or "reptile".

BODY

Dinosaurs, which also includes birds, are archosaurs, like modern crocodilians. Archosaurs' diapsid skulls have two holes, called temporal fenestrae, located where the jaw muscles attach, and an additional antorbital fenestra in front of the eyes. Most reptiles (including birds) are diapsids; mammals, with only one temporal fenestra, are called synapsids; and turtles, with no temporal fenestra, are anapsids. Anatomically, dinosaurs share many other archosaur characteristics, including teeth that grow from sockets rather than as direct extensions of the jawbones. Within the archosaur group, dinosaurs are differentiated most noticeably by their gait. Dinosaur legs extend directly beneath the body, whereas the legs of lizards and crocodylians sprawl out to either side.
Collectively, dinosaurs are usually regarded as a superorder or an unranked clade. They are divided into two orders, Saurischia and Ornithischia, depending upon pelvic structure.
Saurischia includes those taxa sharing a more recent common ancestor with birds than with Ornithischia, while Ornithischia includes all taxa sharing a more recent common ancestor with Triceratops than with Saurischia. Saurischians 'lizard-hipped', from the Greek sauros (σαυρος) meaning 'lizard' and ischion (ισχιον) meaning 'hip joint', retained the hip structure of their ancestors, with a pubis bone directed cranially, or forward. Saurischia includes the bipedal and mostly carnivores, except for birds, and sauropodomorphs, which are long-necked quadrupedal herbivores.