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Temporal range: Early Cretaceous
|An artist's restoration of Siamosaurus suteethorni|
Buffetaut & Ingavat, 1986
| Siamosaurus suteethorni|
Buffetaut & Ingavat, 1986 
Siamosaurus, meaning "Siamese lizard", (SIE-ah-moe-SORE-us) is an extinct genus of spinosaurid which existed during the early Cretaceous period, Thailand. The exact size of this dinosaur is currently unknown, however most estimates suggest that it was around 9.1 metres (30 ft) in length and 2-3 tons in weight.
Little is known about Siamosaurus. Its teeth closely resembled those of its close relative Spinosaurus aegypticus, indicating that its diet mainly consisted of fish and other aquatic animals.
Habitat and behaviorEdit
According to a 2010 publication by Roman Amiot and his colleagues found that oxygen isotope ratios in spinosaurid remains suggest semiaquatic lifestyles. Further comparisons between spinosaurid teeth and those of a contemporary theropod, crocodile and turtle showed that they were more similar to those of crocodilians and turtles than was originally believed, further supporting the notion that Siamosaurus and other spinosaurs were semi-aquatic. Siamosaurus specimens tend to have the largest difference to theropods and Spinosaurus had the smallest. The results of the tests concluded that spinosaurids had lifestyles similar to crocodilians and hippopotamuses and spent most of their daily life in water.
Its semiaquatic life also suggests that Siamosaurus was able to live alongside other theropods without competing for food, since they lived in different habitats and possessed different diets and ecological niches. This would have however encouraged siamosaurs to breed more which may or may not have reduced fish populations quite a bit
Siamosaurus was the only spinosaur to live in south east Asia. How it got there is currently unknown. Why it went there would also be unknown. There seems to be no advantage to living there other than the lack of other spinosaurs and larger carnivores.