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Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5] Evidence suggests that it was semiaquatic; how capable it was of swimming has been strongly contested. Spinosaurus's leg bones had osteosclerosis (high bone density), allowing for better buoyancy control.
Spinosaurines are characterized by straight, unserrated and more widely spaced teeth, and the small size of their first premaxillary teeth. Sereno and colleagues pointed out that the more retracted nostrils in Irritator and the tall sail of Spinosaurus could also be unique traits of spinosaurines, though material from other taxa is needed to ...
Isotope ratios from teeth from 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.
Also, characteristic teeth and a vertebral centra were referred to Spinosaurus sp. [1] [33] Most of the flora and fauna discovered in the Alcântara Formation was also present in North Africa in the Kem Kem Beds of Morocco during the Cenomanian; with a few exceptions including Oxalaia quilombensis, Atlanticopristis equatorialis , Equinoxiodus ...
Irritator is further distinguished from Baryonyx, Suchomimus, and Cristatusaurus by having slightly over half as many teeth in the maxilla, and from Spinosaurus due to its comparatively larger and more forwardly positioned nostril openings, which, unlike in Spinosaurus, are also formed by the premaxilla.
The analysis showed that Thai spinosaurid teeth tended to have the largest difference from the ratios of other, more terrestrial theropods, while those of Spinosaurus from Tunisia and Morocco tended to have the least difference, despite the advanced piscivorous adaptations in the skull observed for this genus. The authors suggested that ...
Spinosaurus teeth, like those of typical theropods, were usually smooth, and Asian forms like Siamosaurus exhibited an increase in the amount of dental ridges. Furthermore, the tooth crown was wrinkled in Ostafrikasaurus , Baryonyx , and Suchomimus , and Asian spinosaurids, but smooth in Spinosaurus , with only some specimens of the latter ...
In one fossil site examined by paleontologists in 2014, Spinosaurus teeth accounted for nearly half of all the fossil teeth recovered, and about a sixth of the total recovered fossils. Teeth of other dinosaurs are considerably more rare, with the fossil Spinosaurus teeth of one site outnumbering the teeth of other dinosaurs by about 150 to one. [9]