Avimimus
Avimimus | |
---|---|
Reconstructed skeleton cast | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | Saurischia |
Clade: | Theropoda |
Clade: | Pennaraptora |
Clade: | †Oviraptorosauria |
Family: | †Avimimidae Kurzanov, 1981 |
Genus: | †Avimimus Kurzanov, 1981 |
Type species | |
†Avimimus portentosus Kurzanov, 1981
| |
Other species | |
|
Avimimus (
Discovery and species
The remains of Avimimus were recovered by Russian paleontologists
A variety of isolated bones that have been attributed to Avimimus were considered to be distinct from A. portentosus, and were initially referred to as Avimimus sp.
Description
Avimimus was a small, bird-like dinosaur with a length of 1.5 m (5 ft).[1] The skull was small compared to the body, though the brain[1] and eyes were large. The size of the bones which surrounded the brain and were dedicated to protecting it are large.[1] This is also consistent with the hypothesis that Avimimus had a proportionally large brain.[1]
The jaws of Avimimus were thought to form a parrot-like beak lacking teeth, and a thorough review of the holotype specimen's anatomy confirmed that no teeth were preserved, although a series of tooth-like projections along the tip of the premaxilla were.[9] However, subsequently discovered specimens have been reported to preserve small premaxillary teeth.[4] The small teeth or possible lack thereof in Avimimus suggests that it may have been an herbivore or omnivore. Kurzanov himself, however, believed that Avimimus was an insectivore.[1]
The
The forelimbs were relatively short. The bones of the hand were fused together, as in modern birds, and a ridge on the
The ilium was almost horizontally oriented, resulting in exceptionally broad hips. Little is known of the tail but the hip suggests that the tail was long. The legs were extremely long and slender, suggesting that Avimimus was a highly specialized runner. The proportions of the leg bones add further weight to the idea of Avimimus was quick on its feet.[1] The animal's shins were long in comparison with its thighs,[1] a trait common among cursorial animals. It also had three-toed feet with narrow pointed claws.
Classification
Avimimus was originally suggested to be a very close relative of birds, given its unique suite of bird-like features not known in other dinosaurs at the time. In fact, Kurzanov argued that Avimimus, rather than the famous early bird
Kurzanov placed Avimimus in its own family, Avimimidae, in 1981. In 1991,
The following cladogram follows an analysis by Phil Senter, 2007.[14]
Caenagnathoidea |
| ||||||||||||||||||||||||||||||||||||||||||||||||
Paleoecology
The
The region that is preserved in the Barun Goyot Formation was home to the
See also
References
- ^ ISBN 0-7853-0443-6.
- S2CID 220413406.
- ^ a b Kurzanov, S.M. (1981). "An unusual theropod from the Upper Cretaceous of Mongolia Iskopayemyye pozvonochnyye Mongolii (Fossil Vertebrates of Mongolia)." Trudy Sovmestnay Sovetsko-Mongolskay Paleontologiyeskay Ekspeditsiy (Joint Soviet-Mongolian Paleontological Expedition), 15: 39-49. Nauka Moscow, 1981
- ^ a b Watabe, Weishampel; Barsbold, Tsogtbaatar; Suzuke (2000). "New nearly complete skeleton of the bird-like theropod, Avimimus, from the Upper Cretaceous of the Gobi Desert, Mongolia". Journal of Vertebrate Paleontology. 20 (3): 77A.
- S2CID 220414868.
- .
- PMID 27767062.
- .
- ^ ISBN 0-520-20094-2
- ^ a b Kurzanov, S.M. (1987). "Avimimidae and the problem of the origin of birds." Transactions of the Joint Soviet-Mongolian Paleontological Expedition, 31: 5-92. [in Russian]
- ^ Dyke; Thorley (1998). "Reduced cladistic consensus methods and the avian affinities of Protoavis and Avimimus". Archaeopteryx. 16: 123–129.
- S2CID 2519726.
- ^ Holtz, Thomas R. Jr. (2010) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
- S2CID 83726237.
- ISBN 978-0-521-78142-8.
- ^ .
- ^ Novacek, M. J., 1996. "Dinosaurs of the Flaming. Cliffs" Anchor/Doubleday. 367 p.
- .