[D] Utahraptor ostrommaysorum [Su] [sG] [T]
Describer
Kirkland, Burge & Gaston, 1993
Time
Cretaceous Early Barremian
Classification
Saurischia Theropoda Tetanurae Coelurosauria Dromaeosauridae
Diet
Carnivore
Fossilsite
Cedar Mountain Formation (Dalton Wells Quarry) of central Utah, US
Length
6 meter
Info
Genus -Typespecies - Skull
Utahraptor ostrommaysorum (Kirkland, Burge & Gaston, 1993) > Utahraptor ostrommaysi (incorrect spelling) (Kirkland, Burge & Gaston, 1993)
(~12 m; ~2.7 tons) caudal vertebrae (Britt et al., 2001) Based on undescribed specimens, this estimate comes from caudals reportedly twice as long as those associated with a 565 mm femur. [M.Mortimer]
\\\\\\\"Utah\\\\\\\'s predator\\\\\\\" An unusually large dromaeosaur (twice as large as Deinonychus) found in the Cedar Mountain Formation of central Utah. There is no evidence that dromaeosaurids were particularly fast as theropods go. In fact, dromaeosaurids have shorter and stockier legs than most other theropods of the same size! Their hindlimbs seem more specialized for power than high speed.
The taxon is based on an associated disarticulated skeleton from one site and disarticulated material of one or more individuals from a second site.
Utahraptor differs from Deinonychus in having a larger size, extremely blade-like manual claws, and distinctive lachrymal that is subrectangular in dorsal view.
Kirkland, Burge & Gaston, 1993
Time
Cretaceous Early Barremian
Classification
Saurischia Theropoda Tetanurae Coelurosauria Dromaeosauridae
Diet
Carnivore
Fossilsite
Cedar Mountain Formation (Dalton Wells Quarry) of central Utah, US
Length
6 meter
Info
Genus -Typespecies - Skull
Utahraptor ostrommaysorum (Kirkland, Burge & Gaston, 1993) > Utahraptor ostrommaysi (incorrect spelling) (Kirkland, Burge & Gaston, 1993)
(~12 m; ~2.7 tons) caudal vertebrae (Britt et al., 2001) Based on undescribed specimens, this estimate comes from caudals reportedly twice as long as those associated with a 565 mm femur. [M.Mortimer]
\\\\\\\"Utah\\\\\\\'s predator\\\\\\\" An unusually large dromaeosaur (twice as large as Deinonychus) found in the Cedar Mountain Formation of central Utah. There is no evidence that dromaeosaurids were particularly fast as theropods go. In fact, dromaeosaurids have shorter and stockier legs than most other theropods of the same size! Their hindlimbs seem more specialized for power than high speed.
The taxon is based on an associated disarticulated skeleton from one site and disarticulated material of one or more individuals from a second site.
Utahraptor differs from Deinonychus in having a larger size, extremely blade-like manual claws, and distinctive lachrymal that is subrectangular in dorsal view.