What is the essential difference between the ornithischian and saurischian pelvis structure?

The Dinosauria contains two major groups of dinosaurs: the Ornithischia, or “bird-hipped” dinosaurs, and the Saurischia, or “lizard-hipped” dinosaurs. The most prominent visible difference between the two types of hip is the orientation of the pubis, shown in white in the picture above.

What is the meaning of ornithischian?

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 are five examples of ornithischians?

Clockwise from upper left: Heterodontosaurus (Heterodontosauridae), Nipponosaurus (Ornithopoda), Borealopelta (Ankylosauria), Triceratops (Ceratopsia), Stegoceras (Pachycephalosauria), and Stegosaurus (Stegosauria).

Is a Stegosaurus a saurischian or ornithischian?

Towering giants such as Tyrannosaurus rex and Apatosaurus are both saurischians, but many plant-eating dinosaurs, including Triceratops and Stegosaurus, are classified as ornithiscians—which means bird-hipped—because their pubis bone was originally thought to resemble that of birds.

Did dinosaurs have hips?

The hips of dinosaurs with forward-oriented pubic bones approximated the hips of lizards, so Seeley called them the saurischians (“lizard-hipped”). The hips of dinosaurs with backward-oriented pubic bones, on the other hand, looked like those of birds, and these animals were cast as ornithischians (“bird-hipped”).

Which dinosaurs had bird hips?

Most dinosaurs had one of two types of hip structures: the bird-hipped or the lizard-hipped….Dinosaur Classification. It’s All in the Hips.

Did ornithischians have feathers?

Although the vast majority of feather discoveries have been in coelurosaurian theropods, feather-like integument has also been discovered in at least three ornithischians, suggesting that feathers may have been present on the last common ancestor of the Ornithoscelida, a dinosaur group including both theropods and …

Where is a bird’s hip?

Bird-hipped (Ornithischian) dinosaurs have a “4 pronged” hip with the pubis parallel to the ischium (pointing backwards towards the tail), which ironically resembles that of modern birds (this means that this type of hip structure evolved at least twice, once with these dinosaurs and again with the bird lineage).

What are the three bones that form the dinosaur pelvis?

The Ornithischian Dinosaurs 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.

What is the heaviest dinosaur ever?

Argentinosaurus
The heaviest dinosaur was Argentinosaurus at 77 tonnes. It was the equivalent to 17 African Elephants. Argentinosaurus is a double award winner being also the longest dinosaur. It is also the largest land animal to have ever lived.