4/10/2023 0 Comments Prehistoric kingdom yutyrannus![]() The feathers were long, up to twenty centimeters, and filamentous. huali is currently the largest known species of dinosaur with direct evidence of feathers, forty times heavier than the previous record holder, Beipiaosaurus. While it has been known since 2004, upon the description of Dilong, that at least some tyrannosaurs possess filamentous “stage 1″ feathers, according to the feather typology of Richard Prum, Y. In the lower jaw, the external mandibular fenestra, the main opening in the outer side, is mainly located in the surangular. The outer side of the main body of the postorbital is hollowed out. The postorbital has a small secondary process, jutting into the upper hind corner of the eye socket. The snout features a high midline crest, formed by the nasals and the premaxillae and which is covered by large pneumatic recesses. The describers established some diagnostic traits of Yutyrannus, in which it differs from its direct relatives. The skulls of the paratypes are 80 and 63 centimeters (31 in and 25 in) long and their weights have been estimated at 596 and 493 kilograms (1,314 lb and 1,087 lb) respectively. Its skull has an estimated length of 905 millimeters (35.6 in). The holotype has a known length of 9 metres (30 feet) and an estimated weight of 1,414 kilograms(3,120 lbs). Yutyrannus was a gigantic bipedal predator. The fossils are part of the collections of the Zhucheng Dinosaur Museum and the Erlianhaote Dinosaur Museum but have been prepared by the Institute of Vertebrate Paleontology and Paleoanthropology, under the guidance of Xu. The paratypes are the two other specimens: ZCDM V5001 consisting of a skeleton of a smaller individual and part of the same slab as the holotype and ELDM V1001, a juvenile estimated to have been eight years younger than the holotype. The holotype, ZCDM V5000, is the largest specimen, consisting of a nearly complete skeleton with skull, compressed on a slab, of an adult individual. The specimens had been cut into pieces about the size of bath mats, which could be carried by two people. They thus probably were found in a layer of the Yixian Formation, dating from the Aptian, about 125 million years old. Yutyrannus is known from three nearly complete fossil specimens (an adult, a subadult, and a juvenile) acquired from a fossil dealer who claimed all three had their provenance in a single quarry at Batuyingzi in Liaoning Province, China. ![]() Illustration of a Yutyrannus family group by artist Brian Choo The specific name consists of the Mandarin huáli, “beautiful”, in reference to the beauty of the plumage. The generic name is derived from Mandarin Chinese yu, “feather” and Latinised Greek τύραννος, tyrannos, “tyrant”, a reference to the fact it is a feathered member of the Tyrannosauroidea. ![]() Yutyrannus, name meaning "Feathered Tyrant", is a proceratosaurid tyrannosauroid theropod dinosaur genus that contains a single type species, Yutyrannus huali, named and described in 2012 by Xu Xing, Wang Kebai, Zhang Ke, Ma Qingju, Xing Lida, Corwin Sullivan, Hu Dongyu, Cheng Shuqing and Wang Shuo. An artist's interpretation of Yutyrannus huali
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