Helicoprion

Helicoprion is a long-lived genus of extinct, shark-like eugeoneodontid holocephalid fish. Helicoprion lived from the late Carboniferous period to the Early Triassic. It is commonly known for its strange teeth that were arranged in a  "tooth whorl". It is estimated to grow 10-15 ft (3-4m) in length.

Jurassic Park Series
Helicoprion is not mentioned in the novels or in the films, however, it is available as an unlockable animal in the Android/iOS game, Jurassic Park:Builder.



Trivia

 * Commonly misidentified as a prehistoric shark, Helicoprion was actually more related to the chimaera, a living fossil.
 * The model that is seen in Jurassic Park:Builder and in other artworks and games is actually inaccurate. Recent studies show the fearsome teeth were built more like a saw instead of hanging outside of the mouth.