What are the two main dinosaur groups?

With the discovery of many new species since the 1840s, the Dinosauria now contains two major groups of dinosaurs: the Ornithischia, or “bird-hipped” dinosaurs, and the Saurischia, or “lizard-hipped” dinosaurs. The division between the two groups was made by H.G. Seeley in 1888.Click to see full answer. Subsequently, one may also ask, what are a group of dinosaurs called?There aren’t really specific terms for groups of dinosaurs. There are many group-terms for living dinosaurs – flock, gaggle, colony, murder. Some people may use these for dinosaurs, especially the more bird-like ones. Then again, there are terms we use today for larger animals: herd, band, pride, pack.Subsequently, question is, what are the three main types of dinosaurs? While scientists have complex ways of classifying dinosaurs, most people separate them into three groups: carnivores, herbivores and omnivores. Let’s learn more about these three types of dinosaurs. Also know, what is the difference between Ornithischians and Saurischians? The term Ornithischia refers to dinosaurs with a “bird hip” structure. Ornithischians were herbivorous dinosaurs and were more numerous than saurischian dinosaurs in terms of population count. Ornithischian dinosaurs have a hip structure where the pubis points backwards and runs parallell to the ischium.What are theropods and sauropods?Air sacs. Along with other saurischian dinosaurs (such as theropods, including birds), sauropods had a system of air sacs, evidenced by indentations and hollow cavities in most of their vertebrae that had been invaded by them. Pneumatic, hollow bones are a characteristic feature of all sauropods.