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Ekrixinatosaurus
''Ekrixinatosaurus'' ('explosion-born reptile') is a genus of theropod dinosaur which lived during the Late Cretaceous. Its fossils have been found in Argentina. The type species, ''Ekrixinatosaurus novasi'', was first described in 2004 by Argentinian paleontologist Jorge Calvo, and Chilean paleontologists David Rubilar-Rogers and Karen Moreno. It was discovered in the Candeleros Formation, a geologic formation that outcrops in Río Negro, Neuquén, and Mendoza provinces of Argentina. The formation dates from 100-97 mya.〔Leanza, H.A.; Apesteguia, S.; Novas, F.E. & de la Fuente, M.S. (2004): Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages. Cretaceous Research 25(1): 61-87. doi:10.1016/j.cretres.2003.10.005 (HTML abstract)〕
''Ekrixinatosaurus novasi'' is a large ceratosaur with a relatively large head and robust limbs, the only known specimen being between in length, some suggested that this specimen actually represented the largest ceratosaur yet described at in length, surpassing the type of ''Carnotaurus'', however, it was later noted by other researchers that this estimate was based only on the absolute size of the skull, ignoring that limb bone comparisons clearly show ''Carnotaurus'' was larger, thus ''Carnotaurus'' was larger than ''Ekrixinatosaurus'' but with a proportionally smaller head.
==Paleocology==
''Ekrixinatosaurus'' shared it environment with the titanosaurian sauropod ''Andesaurus'' and the rebbachisaurid sauropods ''Limaysaurus'' and ''Nopcsaspondylus''. Iguanodont ornithischian remains have reportedly also been found. The carcharodontosaurid ''Giganotosaurus'' was possibly the apex predator. Smaller predators also inhabited the area. These included the dromaeosaurid ''Buitreraptor'', the alvarezsaurid ''Alnashetri'', and the basal coelurosaurian ''Bicentenaria''. The primitive snake ''Najash'' lived here as well, along with turtles, fish, frogs, and cladotherian mammals. Pterosaurs also lived in the area.〔
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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