More info about Liopleurodon
Estimating the size of pliosaurs is difficult because not much is known of their postcranial anatomy. The palaeontologist L. B. Tarlo suggested that their total body length can be estimated from the length of their skull which he claimed was typically one-seventh of the former measurement, applying this ratio to L. ferox suggests that the largest known specimen was a little over 10 m (33 ft) while a more typical size range would be from 5 to 7 m (16 to 23 ft). The body mass has been estimated at 1 and 1. 7 t (2,200 and 3,700 lb) for the lengths 4. 8 and 7 m (16 and 23 ft) respectively.