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The second largest member of the family of ocean predators Mosasauridae, commonly known as mosasaurs, Tylosaurus proriger, once dominated late Cretaceous seas (88 -80.5 million years ago) (Polcyn et al. 2013). At a staggering 13 meters long (Everhart 2002), T. proriger was the apex predator of its time (Everhart 2004). The causes for T. proriger’s early extinction are not directly known, but its relatives in the family Mosasauridae lasted until the extinction event at the end of the Cretaceous, which also wiped out the dinosaurs 66 million years ago (Polcyn et al. 2013).