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Concavenator
''Concavenator'' is a genus of theropod dinosaur that lived approximately 130 million years ago during the early Cretaceous period (Barremian stage). The type species is ''C. corcovatus''; ''Concavenator corcovatus'' means "hump backed hunter from Cuenca".〔 The fossil was discovered in the Las Hoyas fossil site of Spain by paleontologists José Luis Sanz, Francisco Ortega and Fernando Escaso from the Autonomous University of Madrid〔 and the National University of Distance Learning.〔
==Description==
''Concavenator'' was a medium-sized (roughly 6 meters (20 feet) long) primitive carcharodontosaurian dinosaur possessing several unique features. Two extremely tall vertebrae in front of the hips formed a tall but narrow and pointed crest (possibly supporting a hump) on the dinosaur's back.〔 The function of such crests is currently unknown. Paleontologist Roger Benson from Cambridge University speculated that one possibility is that "it is analogous to head-crests used in visual displays", but the Spanish scientists who discovered it noted it could also be a thermal regulator.〔
Additionally, the forelimb (ulna) of ''Concavenator'' preserved evidence of what may be quill knobs or homologous structures, an anatomical feature so far known only in animals with large, quilled feathers on the forelimb.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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