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or greater extent. In a small number of species, serrations are small, and on the lower edge, they are covered by skin. Caniform teeth are found at the front of jaws, although these can be rather small in a few species. They do not have any obviously enlarged caniform teeth in the middle of the lower jaw. Teeth are on the roof of the mouth. In adults, the maxilla does not have a noticeable bony protrusion on the lower rear angle, although it can have a deep step or hook-like process, which is hidden by the upper

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