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Herrerasaurus
''Herrerasaurus'' was one of the earliest dinosaurs. Its name means "Herrera's lizard", after the rancher who discovered the first specimen. All known fossils of this carnivore have been discovered in rocks of Carnian age (late Triassic according to the ICS, dated to 231.4 million years ago) in northwestern Argentina. The type species, ''Herrerasaurus ischigualastensis'', was described by Osvaldo Reig in 1963〔 and is the only species assigned to the genus. ''Ischisaurus'' and ''Frenguellisaurus'' are synonyms.
For many years, the classification of ''Herrerasaurus'' was unclear because it was known from very fragmentary remains. It was hypothesized to be a basal theropod, a basal sauropodomorph, a basal saurischian, or not a dinosaur at all but another type of archosaur. However, with the discovery of an almost complete skeleton and skull in 1988, ''Herrerasaurus'' has been classified as either an early theropod or an early saurischian in at least five recent reviews of theropod evolution, with many researchers treating it at least tentatively as the most primitive member of Theropoda.〔Holtz, Thomas R. Jr. (2011) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,'' (Winter 2010 Appendix. )〕
It is a member of the Herrerasauridae, a family of similar genera that were among the earliest of the dinosaurian evolutionary radiation.〔.〕
==Description==
''Herrerasaurus'' was a lightly built bipedal carnivore with a long tail and a relatively small head. Its length is estimated at ,〔 and its hip height at more than 1.1 meters (3.6 ft). It may have weighed around .〔 In a large specimen, at first thought to belong to a separate genus, ''Frenguellisaurus'', the skull measured in length.〔 Smaller specimens had skulls about long.〔
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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