The quadrate of Mosasaurus beaugei is a key element of the skull that plays a central role in the articulation between the lower jaw (mandible) and the cranium. This bone acts as the main hinge in the jaw joint, allowing both strong biting forces and a wide gape — essential for a large marine predator.
Size : 7,1 / 18 inch /cm
In M. beaugei, specimens found in the phosphatic deposits of Morocco show a quadrate that is robust and slightly curved, with a well-developed suprastapedial and infrastapedial processes forming the tympanic ala, which supported the eardrum. The articular condyle at the lower end of the quadrate is broad and rounded, providing a stable joint surface for the lower jaw. The morphology of the quadrate also contributes to the animal’s hearing system: like other mosasaurs, M. beaugei used this bone to transmit vibrations from water and air to the inner ear, helping it detect prey underwater. Its shape and proportions distinguish it from related species, such as M. hoffmanni, and reflect adaptations to the marine environment of the Late Cretaceous seas of Morocco.
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