There were many marine reptiles that lived during the time of the dinosaurs,
1. The Mosasaurus "lizard of the Meuse River" is the type genus of the mosasaurs, an extinct group of aquatic squamate reptiles. It lived about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
Source: https://www.youtube.com/watch?v=tIXyqEP15NU
1. The Mosasaurus "lizard of the Meuse River" is the type genus of the mosasaurs, an extinct group of aquatic squamate reptiles. It lived about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
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