Genus
Valid Extinct

Utahraptor

Kirkland et al. 1993

Utahraptor is a genus of large dromaeosaurid dinosaur that lived during the Early Cretaceous period from around 139 to 135 million years ago in what is now the United States. The genus was described in 1993 by American paleontologist James Kirkland and colleagues with the type species Utahraptor ostrommaysi, based on fossils that had been unearthed earlier from the Cedar Mountain Formation of Utah. Later, many additional specimens were described including those from the skull and postcranium in addition to those of younger individuals.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
4
Group
Dinosaures
Carnivore Ground dwelling Terrestrial
Utahraptor
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Wikimedia
Utahraptor
Utahraptor
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
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Theropoda Unranked clade
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Neotheropoda Unranked clade
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Averostra Unranked clade
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Tetanurae Unranked clade
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Coelurosauria Unranked clade
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Maniraptora Unranked clade
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Paraves Unranked clade
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Deinonychosauria Infraorder
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Dromaeosauridae Family
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Eudromaeosauria Unranked clade
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Utahraptor Genus
Measurements
Length
5,1 m ⓘ
Utahraptor ostrommaysorum
5,5 m ⓘ
Mass
470 kg ⓘ
Utahraptor ostrommaysorum
Fossil sites 4 geolocated sites
Distribution
Top countries
🇺🇸 United States
4
Geological formations
Cedar Mountain
4
Temporal distribution
Valanginian (137.05–132.6 Ma)
4
Species (1)
Utahraptor ostrommaysi 137 Ma
Images 2
Bibliography
Original description
J. I. Kirkland, D. Burge, and R. Gaston. 1993. A large dromaeosaur (Theropoda) from the Lower Cretaceous of eastern Utah. Hunteria 2(10):1-16
Bibliography (4)
T. Oswald and C. Boisvert. 2025. “Here be dragons”: shed teeth potentially Indicate the presence of multiple unidentified allosauroids from the Early Cretaceous Cedar Mountain Formation of Utah. Journal of the Arizona-Nevada Academy of Science 50(2):55–129 DOI ↗
J. S. Tweet, V. L. Santucci, and T. Connors, J. P. Kenworthy. 2012. Paleontological Resource Inventory and Monitoring: Northern Colorado Plateau Network. National Park Service Technical Report NPS/NCPN/NRTR—2012/585
B. B. Britt, K. L. Stadtman, and R. D. Scheetz. 1996. The Early Cretaceous Dalton Wells dinosaur fauna and the earliest North American titanosaurid sauropod. Journal of Vertebrate Paleontology 16(3, suppl.):24A
J. I. Kirkland, D. Burge, and R. Gaston. 1993. A large dromaeosaur (Theropoda) from the Lower Cretaceous of eastern Utah. Hunteria 2(10):1-16