Mosasaur

Mosasaurs lived in the Late Cretaceous and became extinct about 66 million years ago. London's Natural History Museum notes that some of their oldest known fossils are around 94 million years old, suggesting that they evolved slightly earlier.

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Sources describe different beginnings: a study published in 2014 dates the appearance of mosasaurs to about 98 million years ago, the Natural History Museum describes some of their oldest known fossils as around 94 million years old, and the abstract of a 2024 thesis places the group's entry into the sea at about 100 million years ago. These statements concern the fossil record, estimates of the group's history and its transition into the sea.

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A study published in 2014 proposes that high productivity in Late Cretaceous seas was the most likely driver of mosasaur evolution, and links its collapse at the end of the period, coincident with a bolide impact, to the group's extinction. The study notes that no single factor unambiguously explains every diversification and extinction event.

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Mosasaurs are extinct marine reptiles belonging to the squamates, the group that includes lizards and snakes; they are not dinosaurs.

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