Ornithischia - Wikipedia
Ornithischia (/ ˌɔːrnəˈθɪski.ə /) is an extinct clade of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds. [6] The name Ornithischia, or "bird-hipped", reflects this similarity and is derived from the Greek stem ornith- (ὀρνιθ-), meaning "bird", and ischion (ἴσχιον), [a ...
The Ornithischian Dinosaurs - University of California Museum of ...
The Ornithischian Dinosaurs. What makes an ornithischian dinosaur? All terrestrial animals and even marine animals derived from terrestrial stocks have hip girdles, or pelvises, and all hip girdles are composed of three bones: the ilium, ischium, and pubis.
Ornithischian | Triassic, Jurassic, Cretaceous | Britannica
ornithischian, any member of the large taxonomic group of herbivorous dinosaurs comprising Triceratops and all dinosaurs more closely related to it than to birds. The ornithischians (meaning “bird-hipped”) are one of the two major groups of dinosaurs, the other being the saurischians.
Evolutionary changes in pubic orientation in dinosaurs are …
The classic subdivision of Dinosauria into Ornithischia and Saurischia (even if this might not represent true phylogenetic relationships, see Baron et al. 2017a) recalls differences in the structure of the pelvis: ornithischians have retroverted pubes similar to the condition in birds, whereas most saurischians have anteriorly projecting pubes (...
Ornithischia - University of California Museum of Paleontology
All terrestrial animals and marine animals derived from terrestrial stock have hip girdles, or pelvises, and all hip girdles are composed of three bones: the ilium, ischium, and pubis. All ornithischians are united by a pubis pointing backward, running parallel with the ischium.
Dinosaur - Ornithischia, Herbivore, Reptile | Britannica
2024年10月7日 · The Ornithischia were all plant eaters, as far as is known. In addition to a common pelvic structure, they share a number of other unique features, including a bone that joined the two lower jaws and distinctive leaf-shaped teeth crenulated along the upper edges.
A new hypothesis of dinosaur relationships and early dinosaur ... - Nature
2017年3月23日 · Since 1887 (ref. 3) theropods and sauropodomorphs, which retain a classically reptile-like pelvic anatomy, have been regarded as forming a natural group (Saurischia), distinct from Ornithischia...
A new Heterodontosaurus specimen elucidates the unique
2021年7月6日 · Hypothesized stepwise evolution of the ornithischian pelvic bellows and accompanying skeletal modifications and myological innovations.
A primitive ornithischian dinosaur from the Late Triassic of South ...
2007年6月13日 · Eocursor is known from a single specimen comprising substantial cranial and postcranial material and represents the most complete Triassic member of Ornithischia, providing the earliest evidence for the acquisition of many key ornithischian postcranial characters, including an opisthopubic pelvis.
Ornithischian Dinosaurs
Ornithischian pelvic bones: The Ornithischian order has itself been divided into a number of subgroups. These include: Ankylosaurs; Ceratopsians; Ornithopods (includes Hadrosaurs and Hypsilophodonts) Pachycephalosaurs; Stegosaurs. Ornithischia Timeline: