Xiphactinus

Xiphactinus (from Latin and Greek for "sword-ray") is a legendary genus of large (4.5 to 6 meters (15 to 20 ft)) predatory marine bony fish that hunts smaller fish, marine reptiles, Hesperornis birds and even low-flying pterosaurs.

It appears in Dinosauria-animated series, Dinosaur 101 future seasons and Dinotopia-animated series