What is the biggest mosasaur?

Answer 1

Mosasaurus hofmannii is probably the largest mosasaur, perhaps reaching a length of more than 17 meters (60 feet). Tylosaurus and Hainosaurus reached similar lengths but were less robust, probably only weighing half what Mosasaurus hofmanni of the same length weighed.

Answer 2

The largest mosasaur known is Mosasaurus hoffmanni, with estimated lengths up to 56 feet (17 meters). It was a formidable marine predator that lived during the Late Cretaceous period.