A mosasaur jaw of a Halisaurus arambourgi from the Couche III in the phosphate mines of Oued Zem, Khouribga, Morocco. The teeth of these halisaurines resemble those of its contemporary relative, Pluridens serpentis, but are smaller and lack the enamel folds towards the base of the crown. Halisaurus is one of the smaller known mosasaurs to be described.














