Ornithischia - Wikipedia
Ornithischia (/ ˌ ɔːr n ə ˈ θ ɪ s k i. 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 ...
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.
What is the Difference Between Saurischians and Ornithischians?
2024年5月21日 · Saurischians and ornithischians are the two groups of dinosaur, defined in terms of pelvic structure. Saurischians, whose name means "lizard-hipped," had a pelvic structure more similar to that of modern lizards, while the ornithischians ("bird-hipped") had a pelvic structure more like modern birds.
Dinosaur - Ornithischia, Herbivore, Reptile | Britannica
2025年1月2日 · Dinosaur - Ornithischia, Herbivore, Reptile: The Ornithischia were plant-eaters. In addition to a common pelvic structure, they share unique features like a bone joining the lower jaws and crenulated, leaf-shaped teeth. Cerapoda is divided into three groups: Ornithopoda, Pachycephalosauria, and Ceratopsia.
Evolutionary changes in pubic orientation in dinosaurs are …
Among dinosaurs, the pubis has convergently retroverted four times in Maniraptora (Theropoda) and once in Ornithischia. Although a clear correlation has not been demonstrated, it has been previously proposed that two traits were related to pubic retroversion: the reduced importance of cuirassal ventilation, and a herbivorous diet.
Ornithischian Dinosaurs
The name "Ornithischia" means "bird-hipped" and was chosen because of similarity of the animals' hip bones and pelvic joint to that of birds (although birds actually evolved from Saurischian ("lizard-hipped") dinosaurs).
Saurischia Versus Ornithischia - DinoPit
2022年4月4日 · Ornithischian dinosaurs have a hip structure where the pubis points backwards and runs parallell to the ischium. These dinosaurs also frequently have a forward pointing process as well which gives them the appearance of having a four pronged pelvis. Those four prongs come from the two rear facing processes and the two forward facing processes.
NPS Handbook: The Dinosaur Quarry - U.S. National Park Service
2005年1月17日 · The important structural difference in dinosaurs is found in the pelvis. In all land vertebrates, the pelvis is made up of three pairs of bones called the ilium, pubis, and ischium. The paired ilium is joined to each side of the backbone and projects downward to meet the pubis and ischium at the socket for the head of the thigh bone.
Ornithischia | Paleontology Wiki - Fandom
The ornithischian pubis bone points downward and toward the tail (backwards), parallel with the ischium, with a forward-pointing process to support the abdomen. This makes a four-pronged pelvic structure. In contrast to this, the saurischian pubis points downward and towards the head (forwards), as in ancestral lizard types.
Ornithischia - Students | Britannica Kids | Homework Help
One of the two major orders of dinosaurs, the Ornithischia were those dinosaurs whose pelvic structure resembled that of modern birds. This key feature distinguished the ornithischians from the other major dinosaur order, the so-called “lizard-hipped” Saurischia .