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'''''Edmarka''''' is a [[genus]] of [[dinosaur]] from the [[Late Jurassic]] of [[North America]]. The name honours scientist Bill Edmark. It was a [[theropod]] closely related to ''[[Torvosaurus]]'', and may, in fact, be a [[Synonym (taxonomy)|junior synonym]] of that genus. Its fossils, including a partial skeleton, were found at [[Como Bluff]], [[Wyoming]]. |
'''''Edmarka''''' is a [[genus]] of [[dinosaur]] from the [[Late Jurassic]] of [[North America]]. The name honours scientist Bill Edmark. It was a [[theropod]] closely related to ''[[Torvosaurus]]'', and may, in fact, be a [[Synonym (taxonomy)|junior synonym]] of that genus. Its fossils, including a partial skeleton, were found at [[Como Bluff]], [[Wyoming]]. |
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The [[type species]], ''E. rex'', was described in 1992 by [[Robert Bakker]], Donald Kralis, James Siegwarth and James Filla. They distinguished their new species from ''Torvosaurus tanneri'' by features of the [[jugal]] bone, which shows both primitive and derived features. The scapula-coracoid, ribs, and pubis were also described. Bakker ''et al''. were impressed with the size of ''Edmarka'', noting that it "would rival ''[[Tyrannosaurus|T. rex]]'' in total length," and viewing this approximate size as "a natural ceiling for dinosaurian meat-eaters." Torvosaurine megalosaurs appear to occupy the top predator niche only in the lower and middle [[Morrison Formation]], and were replaced in the upper Morrison Formation by giant [[Allosauridae|allosaurids]]. The presence of ''Torvosaurus'' and ''Edmarka'' in various Morrison Formation rocks upholds Dr. Robert T. Bakker's theory that there is only one large predator in a setting, and the presence of it prevents the evolution of any other. |
The [[type species]], ''E. rex'', was described in 1992 by [[Robert Bakker]], Donald Kralis, James Siegwarth and James Filla. They distinguished their new species from ''Torvosaurus tanneri'' by features of the [[jugal]] bone, which shows both primitive and derived features. The scapula-coracoid, ribs, and pubis were also described. Bakker ''et al.''. were impressed with the size of ''Edmarka'', noting that it "would rival ''[[Tyrannosaurus|T. rex]]'' in total length," and viewing this approximate size as "a natural ceiling for dinosaurian meat-eaters." Torvosaurine megalosaurs appear to occupy the top predator niche only in the lower and middle [[Morrison Formation]], and were replaced in the upper Morrison Formation by giant [[Allosauridae|allosaurids]]. The presence of ''Torvosaurus'' and ''Edmarka'' in various Morrison Formation rocks upholds Dr. Robert T. Bakker's theory that there is only one large predator in a setting, and the presence of it prevents the evolution of any other. |
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==References== |
==References== |
Revision as of 17:01, 17 May 2009
Edmarka Temporal range: Tithonian
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Genus: | Edmarka
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Edmarka rex Bakker, Kralis, Siegwarth & Filla, 1992
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Edmarka is a genus of dinosaur from the Late Jurassic of North America. The name honours scientist Bill Edmark. It was a theropod closely related to Torvosaurus, and may, in fact, be a junior synonym of that genus. Its fossils, including a partial skeleton, were found at Como Bluff, Wyoming.
The type species, E. rex, was described in 1992 by Robert Bakker, Donald Kralis, James Siegwarth and James Filla. They distinguished their new species from Torvosaurus tanneri by features of the jugal bone, which shows both primitive and derived features. The scapula-coracoid, ribs, and pubis were also described. Bakker et al.. were impressed with the size of Edmarka, noting that it "would rival T. rex in total length," and viewing this approximate size as "a natural ceiling for dinosaurian meat-eaters." Torvosaurine megalosaurs appear to occupy the top predator niche only in the lower and middle Morrison Formation, and were replaced in the upper Morrison Formation by giant allosaurids. The presence of Torvosaurus and Edmarka in various Morrison Formation rocks upholds Dr. Robert T. Bakker's theory that there is only one large predator in a setting, and the presence of it prevents the evolution of any other.
References
- Bakker, R.T., D. Kralis, J. Siegwarth & J. Filla, 1992. Edmarka rex, a new, gigantic theropod dinosaur from the middle Morrison Formation, Late Jurassic of the Como Bluff Outcrop Region. Hunteria 2 (9): 1-24.
External links
- Edmarka in the Dinosaur Encyclopedia