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Many palaeontologists later questioned Buffetaut and Ingavat's identification of Siamosaurus, given that spinosaurid teeth, including many from Asia, have often been mistaken for those of aquatic reptiles like crocodilians, plesiosaurs, and ichthyosaurs. [43]
The teeth of spinosaurids were conical, with an oval to circular cross section and either absent or very fine serrations. Their teeth ranged from slightly recurved, such as those of Baryonyx and Suchomimus, to straight, such as those of Spinosaurus and Siamosaurus, and the crown was often ornamented with longitudinal grooves or ridges. [35] [38]
English: Size comparison of the spinosaurid dinosaurs Siamosaurus suteethorni and "Phuwiang spinosaurid B", whose remains might be referable to the genus. References: Size estimates for Siamosaurus suteethorni: Size estimates for "Phuwiang spinosaurid B":
Partial tooth of an indeterminate spinosaurid (KDC-PV-0003) and possible Siamosaurus tooth (GMNH-PV-999) from the Sebayashi Formation in the National Museum of Nature and Science, Tokyo Bivalvia indet.
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Siamotyrannus is a large theropod. Buffetaut estimated its length at seven meters. In 2010, Gregory S. Paul estimated the length at 6 meters (20 ft), the weight at 500 kg. [3]
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In 2014, it was announced that more remains from the dig site had been recovered; these fossils included teeth, more vertebrae (backbones) and a pubic bone from the same individual. The holotype specimen is estimated to have been between 8.5 to 10.5 metres (28 to 34 feet) long and to have weighed 2.4 tonnes (2.6 short tons ; 2.4 long tons ).