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Siamosaurus
''Siamosaurus'' (meaning "Siamese lizard") is a genus of theropod dinosaur from Early Cretaceous Thailand. The size of the animal is unknown, but it may have reached a length of about 9.1 meters (30 ft). The type species, ''Siamosaurus suteethorni'', was formally described by Buffetaut and Ingavat in 1986.〔Buffetaut, E.; and Ingevat, R. (1986). Unusual theropod dinosaur teeth from the Upper Jurassic of Phu Wiang, northeastern Thailand. Rev. Paleobiol. 5: 217-220.〕 There is very little information on this Cretaceous meat-eater, but it is known from teeth that closely resemble those of ''Spinosaurus''; it may have eaten fish.
==Habitat==
A 2010 publication by Romain Amiot and colleagues found that oxygen isotope ratios of spinosaurid bones indicates semiaquatic lifestyles. Isotope ratios from teeth from the spinosaurids ''Baryonyx'', ''Irritator'', ''Siamosaurus'', and ''Spinosaurus'' were compared with isotopic compositions from contemporaneous theropods, turtles, and crocodilians. The study found that, among theropods, spinosaurid isotope ratios were closer to those of turtles and crocodilians. ''Siamosaurus'' specimens tended to have the largest difference from the ratios of other theropods, and ''Spinosaurus'' tended to be have the least difference. The authors concluded that spinosaurids, like modern crocodilians and hippopotamuses, spent much of their daily lives in water. The authors also suggested that semiaquatic habits and piscivory in spinosaurids can explain how spinosaurids coexisted with other large theropods: by feeding on different prey items and living in different habitats, the different types of theropods would have been out of direct competition.
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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