![]() ![]() This style of hip is more similar to modern birds. These dinosaurs are called bird-hipped dinosaurs, or Ornithischians. Some dinosaurs have a closed hip system in which the pubis and the ischium are close together. The hip has three bones: the pubis, ischium, and ilium. This division, first proposed by British paleontologist Harry Sheely in 1888, has traditionally been thought to be at the ‘order’ level in biological classification schemes, but modern research suggests that instead, it may merely be a clade. The most basic subdivision of dinosaurs is based on their hips. Ornithischian pelvis with a closed structure. In this case study, we will talk about the seven major groups that include the vast majority of known dinosaurs and how those groups relate to one another. Understanding these groups can not only help in placing fan favorites like Triceratops and Velociraptor into a greater context, but also to show how different animals are related to one another and evolved from common ancestors. Image by Callan Bentley.ĭinosaurs are a diverse group of reptiles and can be classified into various different groups. The major branches of the dinosaur family tree. Describe major subdivisions within each order, like theropods, sauropodomorphs, thyreophora, ornithopods, and marginocephalia. ![]()
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