Temporal range: Early Cretaceous, 130 Ma
Scientific classification
Buffetaut & Ingavat, 1986
  • S. suteethorni Buffetaut & Ingavat, 1986 (type)

Siamosaurus (meaning "Siamese lizard") is a genus of theropod dinosaur from Early Cretaceous Thailand. The animal is a tooth taxon which accounts for its completely speculative description.[1] 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.[2] 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.


Phuwiangosaurus and Siamosaurus in their 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 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. [3]

Other Languages
català: Siamosaure
čeština: Siamosaurus
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فارسی: سیاموسور
français: Siamosaurus
italiano: Siamosaurus
magyar: Siamosaurus
Nederlands: Siamosaurus
ଓଡ଼ିଆ: Siamosaurus
polski: Syjamozaur
Simple English: Siamosaurus
slovenčina: Siamosaurus
svenska: Siamosaurus
Tiếng Việt: Siamosaurus
Volapük: Siamosaurus
中文: 暹羅龍屬