The longest discovered mosasaur is Hainosaururs which was about 17.5 m (57.41 ft) in length. This animal was one of the top marine predators of the Late Cretaceous.
Source: https://dinoanimals.com
Mosasurus were large, extinct, marine reptiles. From Latin Mosa meaning the “Meuse river”, and Greek sauros meaning “lizard”.
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