Trignathorus

A large aquatic predator with a very long body and a head seemingly composed exclusively of three protruding jaws. It launches itself forward at high speed to gnaw on its preys with its incredible jaw power, then digests the chunks it has carved out slowly. It prefers to hunt larger organisms, until the point comes where its size outgrows every creature around, and thus starts swallowing fishes and visitors in a single gulp.