were associated with the original Siamosaurus teeth, the Khok Kruat skeleton, SM-KK 14, may be attributable to the genus. The cervical vertebrae of SM-KK 14 had elongated centra (vertebral bodies) with articulating surfaces that were not offset, as well as prominent epipophyses (processes to which neck muscles attached) and strong ligament scars. All of these characteristics were also present in Baryonyx. The cervicals also became longer towards the front of the neck and—based on comparison with Baryonyx—may represent the fourth, sixth, seventh, and tenth vertebrae. The dorsal vertebrae had enlarged infraprezygapophyseal fossae—depressions under the prezygapophyses, which connect adjacent vertebrae—and their neural spines were elongated similarly to those of other spinosaurids, indicating the presence of a sail on the animal's back; like in the Asian spinosaurid Ichthyovenator. One of the neural spines of SM-KK 14 measured at least in height. The chevron lacked a process on its front end, as in other spinosaurids. Viewed distally (towards the centre of attachment), the lower end of the pubis had an L-shape, similar to that of Ichthyovenator and the African Suchomimus. Also as in Ichthyovenator, the hind rim of the pubis had a notch-like obturator foramen. However, in SM-KK 14 the front of the pubis was concave and the chevrons were curved backwards, in contrast to the straight condition these bones had in Ichthyovenator. Classification In 1986, Buffetaut and Ingavat classified Siamosaurus as a theropod because of the straight, tall crown and double sideways recurvature of its teeth. At the time, Siamosauruss particular combination of dental characteristics, especially the longitudinal fluting and lack of serrations, had not been observed in other theropods. The authors noted similarities in Siamosauruss teeth to those of ceratosaurian tooth crowns, some of which also have longitudinal flutes. However, this identification was ruled out, since ceratosaur teeth are more narrow and blade-like in cross-section, bear far fewer dental flutes, and have distinct serrations. Buffetaut and Suteethorn concluded that the closest taxon in dentition to Siamosaurus was Spinosaurus aegyptiacus from Egypt, whose fragmentary fossils had been destroyed during World War II. Like Siamosaurus, this African taxon had straight and unserrated conical teeth. Though Spinosaurus lacked the developed flutes seen in Siamosaurus, Buffetaut and Ingavat noted that both smooth and fluted spinosaur teeth had been reported from Africa. Therefore, they tentatively placed Siamosaurus in the family Spinosauridae, based on the close similarities in dentition to S. aegyptiacus. Many palaeontologists later questioned Buffetaut