Spinosaurus is known for its elongated skull, its large size, and its sail or hump.
The skull had a narrow snout filled with straight conical teeth that lacked serrations.
There were six or seven teeth on each side of the very front of the upper jaw, in the premaxillae,
and another twelve in both maxillae behind them. The second and third teeth on each side were noticeably
larger than the rest of the teeth in the premaxilla, creating a space between them and the large teeth
in the anterior maxilla; large teeth in the lower jaw faced this space. The very tip of the snout holding
those few large anterior teeth was expanded, and a small crest was present in front of the eyes.
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