![]() ![]() ![]() The genus Microraptor is one of the oldest-known dromaeosaurids, and is phylogenetically more primitive than Utahraptor. Īlthough feathers have never been found in association with Utahraptor specimens, there is strong phylogenetic evidence suggesting that all dromaeosaurids possessed them. in 2012, Utahraptor differs from other dromaeosaurids in: an elongate nasal process of the premaxilla a distal end of metatarsal III that is smooth, not ginglymoid an L-shaped quadratojugal without a posterior process the presence of a well-developed notch between the lesser trochanter and greater trochanter and dorsal vertebrae that lack pleurocoels. In the revised diagnosis conducted by Turner et al. in 1993, Utahraptor can be recognized by the following autapomorphies: claws on the hand that are more specialized as cutting blades than in other dromaeosaurids a lacrimal bone with distinctly parallel mesial and outer sides, giving it an elongate subrectangular appearance in top view, and a base of nasal opening on the premaxilla parallel to the premaxillary tooth row. In 2016 Rubén Molina-Pérez and Asier Larramendi estimated the largest specimen (BYU 15465) at 4.65 m (15.3 ft) long, 1.5 m (4.9 ft) tall at the hips and 280 kg (620 lb) in weight they claim the larger estimates are due to nine specimens of various ages being mixed. However, the 2001 Kirkland discovery indicates the species may be far heavier than previously estimated. estimated its weight around 230 to 450 kg (500 to 1,000 lb), comparable to a grizzly bear. 2009 ) is estimated to have reached up to 7 m (23 ft) long and somewhat less than 500 kg (1,100 lb) in weight, comparable to a polar bear in weight. ostrommaysi specimen (BYUVP 15465, referred by Erickson et al. The second pedal ungual is preserved at 22 cm (8.7 in) in length and is estimated to reach 24 cm (9.4 in) restored. Like other dromaeosaurids, Utahraptor had large curved claws on their second toes. These elements have huge proportions compared to other dromaeosaurids, suggesting an animal about twice the length of Deinonychus or, surpassing it in a 100%. The holotype of Utahraptor, CEU 184v.86 consists of a second pedal ungual, with potentially assigned elements from other specimens: pedal ungual CEU 184v.294, tibia CEU 184v.260 and premaxilla CEU 184v.400. Size of Utahraptor (right) compared to Achillobator (left) and Dakotaraptor (center). spielbergi" after film director Steven Spielberg, in exchange for funding paleontological research, but no agreement could be reached on the amount of financial assistance. Earlier, it had been intended to name the species " U. ![]() The specific name, ostrommaysi, is in honour to John Ostrom for his investigations on Deinonychus and its bird relationships, and Chris Mays, who helped in the research of Utahraptor by founding Dinamation. The genus name Utahraptor is in reference to Utah, where the remains were found. The type species, Utahraptor ostrommaysi, was named by Kirkland, Gaston, and Burge in June 1993. The holotype, CEU 184v.86, is currently housed at the College of Eastern Utah Prehistoric Museum, although Brigham Young University, the depository of Jensen's finds, currently houses the largest collection of Utahraptor fossils. After a find of a large foot-claw by Carl Limone in October 1991, James Kirkland, Robert Gaston, and Donald Burge uncovered further remains of Utahraptor in 1991 in the Gaston Quarry in Grand County, Utah, within the Yellow Cat and Poison Strip members of the Cedar Mountain Formation. The first specimens of Utahraptor were found in 1975 by Jim Jensen in the Dalton Wells Quarry in east-central Utah, near the town of Moab, but did not receive much attention. ![]()
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