- 25 metre(s)
- United Kingdom (Fossilised specimens are relatively common and have been found in Europe and South America)
The largest plesiosaur ever to swim in the oceans was <EM> Liopleurodon</EM> , with a length of up to 25m (82 ft). <EM> Liopleurodon</EM> was a carnivore, with a short neck, a head 3m (10ft) long, and four powerful flippers. These relatives of the dinosaurs lived in the late Jurassic period, between 165 and 150 million years ago.