Theropod
Theropods ('beast foot') are a group of bipedal saurischian dinosaurs.
| Theropods | |
|---|---|
| File:Coelophysis bauri mount.jpg | |
| Mounted skeleton of Coelophysis bauri, Cleveland Museum of Natural History | |
| Scientific classification e | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Saurischia |
| Clade: | Theropoda Marsh, 1881 |
| Subgroups[1] | |
Although they were primarily carnivorous, a number of theropod groups evolved herbivory, omnivory and insectivory.[2]
Today, they are represented by 10,000 living species of birds, which evolved in the Upper Jurassic from small feathered coelurosaurian theropods.
Among the features linking theropods to birds are bipedalism, the three-toed foot, a furcula (wishbone), air-filled bones, feathers and brooding of the eggs.
Early theropods
Theropods first appear in the earliest part of the Upper Triassic about 230 million years ago. They were the sole large terrestrial carnivores from the Lower Jurassic until the close of the Cretaceous, about 66 million years ago.
Some of the earliest and most primitive of the theropod dinosaurs were:
- Eodromaeus
- coelophysids, a family including Coelophysis
Theropod Media
- A special composite of birds.jpg
In the modern fauna, theropods are represented by over 11,000 species of birds, which are a group of maniraptoran theropods within the clade Avialae.
- Jinfengopteryx elegans 2.JPG
Specimen of the troodontid Jinfengopteryx elegans, with seeds preserved in the stomach region
- Longest theropods.svg
Size comparison of selected giant theropod dinosaurs – the longest (left) is Spinosaurus aegyptiacus, shortest (right) is Carcharodontosaurus saharicus.
- Bee hummingbird (Mellisuga helenae) adult male in flight-cropped.jpg
An adult male bee hummingbird, the smallest known theropod and the smallest living dinosaur
- Struthio camelus - Etosha 2014 (1).jpg
An ostrich walking on a road in Etosha National Park, Namibia
Mummified enantiornithean wing (of an unknown genus) from Cenomanian amber from Myanmar
- Archaeo-deinony hands.svg
Diagram of Deinonychus (left) and Archaeopteryx (right) forelimbs illustrating wing-like posture
- Herrerasaurusskeleton.jpg
Possible early forms Herrerasaurus (large) and Eoraptor (small)
- Othniel Charles Marsh - Brady-Handy.jpg
Othniel Charles Marsh, who coined the name Theropoda. Photo c. 1870
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Related pages
References
- ↑ Holtz, Thomas R., Jr. (2012). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2011 Appendix.
- ↑ Zanno L.E; Gillette D.D; Albright L.B. and Titus A.L. 2009. A new North American therizinosaurid and the role of herbivory in 'predatory' dinosaur evolution. Proceedings of the Royal Society B, Published online before print July 15, 2009, doi: 10.1098/rspb.2009.1029.