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|An artist's restoration of Siamosaurus suteethorni|
Buffetaut & Ingavat, 1986
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 relative species; like Spinosaurus aegypticus, its diet is presumed to be mainly consisted of aquatic animals; like large fish & crocodymorphs; albeit it is known that the spinosaurids were generalist carnivores; indicating siasmosaurus would be able to hunt/search for the terrestrial prey as well. This carnivore generalism seems to be the case as some of the siasmosaurus remains found to be with the direct assosication with sauropod remains 
Habitat and behavior
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 some species of spinosaurids were likely semi-aquatic. Siamosaurus specimens tend to have the largest difference to theropods and Spinosaurus had the smallest. The results of the tests concluded that some spinosaurids had lifestyles similar to crocodilians and hippopotamuses and spent most of their daily life in water.
Its indicated or suggested semiaquatic adaptations might 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 aquatic animal species populations and probably forced the animal onto more terrestrial prey items, as indicated by the sauropod remains direct association with Siamosaurus.
Siamosaurus and Ichthyovenator are the two primary spinosaurid species that live in south east Asia. How they migrated there or why they lived there is unknown. There seems to be no identifiable advantages living there, other than maybe the lack of larger spinosaurids and larger carnivores.
- Buffetaut, E.; and Ingevat, R. (1986). Unusual theropod dinosaur teeth from the Upper Jurassic of Phu Wiang, northeastern Thailand. Rev. Paleobiol. 5: 217-220.