Ornithischia Dinosaur Biology
The Ornithischia dinosaur belongs to an order of herbivore dinosaurs. They are often called the bird-hipped dinosaurs. These prehistoric animals first appeared about 230 million years ago. Like the other dinosaurs, they became extinct during the K-T extinction event 66 million years ago.
The Ornithischia were able to walk in a two or four-legged manner.
The bird-hipped dinosaurs are vertebrates and belong to the phylum Chordata. They also belong to the clade Dinosauria and are true dinosaurs.
There are a number of Ornithischia subgroups. These include the:
Thyreophora: were the armored dinosaurs. Stegosaurus, Euoplocephalus and Talarurus were members of this group with distinctive body armor. Some like the Stegosaurus also had spikes and plates.
Ceratopsidae: were the horned dinosaurs that possessed beaks and horns. Triceratops and Pentaceratops are Ceratopsids.
Iguanodontia: were the beaked and duck-billed dinosaurs. Iguanodon, Edmontosaurus and Parasaurolophus belonged to this group.
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Bird-Hipped Dinosaurs, BBC.