Late Cretaceous Seas

Trinacromerum is a pretty average polycotylid with a pretty average, but robust and stout, streamlined body. However, its long flippers and streamlined body allowed Trinacromerum to achieve higher speeds than many other plesiosaurs. These higher speeds, agility, and the long wide head of the animal potentially allowed for predation of faster fish than those taken as prey by larger slower plesiosaurs. Unfortunately no quality images of high speed chases featuring Trinacromerum are online, so I have none to share today.