Ornithopoda

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Ornithopoda

[‚ȯr·nə′thäp·ə·də]
(paleontology)
A suborder of extinct reptiles in the order Ornithischia including all bipedal forms in the order.

Ornithopoda

 

a suborder of ornithischian dinosaurs, representatives of which moved on their two hind legs (bipedalism). In an upright position, the animals attained a height of 10 m. Ornithopods lived from the Late Jurassic to the end of the Cretaceous. They were predominantly semiaquatic or aquatic and fed on terrestrial or aquatic vegetation, possibly also on small aquatic animals. The teeth were cemented together along the entire length of the jaw. Vertically, each row of teeth consisted of several crowns, which were replaced by new ones as they wore out. The massive hind limbs were 1½ to two times the length of the forelimbs. The most widely studied ornithopods are the families Iguanodontidae and Hadrosauridae, which were widely distributed on all continents except Australia.

REFERENCE

Osnovy paleontologii: Zemnovodnye, presmykaiushchiesia i ptitsy. Moscow, 1964.
References in periodicals archive ?
Diluvicursor shows for the first time that there were at least two distinct body-types among closely related ornithopods in this part of Australia.
During the Early Cretaceous the ornithopod faunas suffered some changes: the camptosaurids were gradually replaced by more derived iguanodontians and the smaller forms maintaining close species of Hypsilophodon, among others (Ortega et al.
While conducting their research, the team also discovered that this dinosaur prey was a previously unrecognized species of a small ornithopod dinosaur, which has yet to be named.
The ornithopod tracks are similar to those used to define the Iguanodontipus ichnogener (Sarjeant et al.
Emended diagnosis: styracosternan ornithopod characterized by a single autapomorphy: axis with neural spine tall (i.
Thus, it is preferred provisionally to refer these ornithopods to Rhabdodon sp.
Hadrosaurs or duck-billed dinosaurs, along with the small ornithopod Thescelosaurus, preferred to live along the edge of rivers, while Ceratopsians preferred to be several miles inland.
The age, size and shape of the likely burrows led Martin to hypothesize that they were made by small ornithopod dinosaurs, which were herbivores that were prevalent in the region.
For example, Hunt and Lucas (2006) considered that ornithopod tracks are more abundant in Cretaceous outcrops.
Some of these features have been identified as belonging to theropod (including avian) and small ornithopod ichnotaxa.