Lived during the Triassic Period. This awkward looking shark is known mostly for it's "tooth whirl" on it's lower jaw. At first when archeologists found the 'tooth whirl' they thought it was some kind of ammonite shell. This creature's size is estimated to be around 7.5 meters long. The question on where the 'tooth whirl' was actually on the body was a difficult question to scientists in the 20th century. At first they thought it had a long, toothy bottom jaw, but was later claimed that it would make it harder for the creature to swim.
The Helicoprion or Heli Is a light blue sharklike predator (More closely related to ratfish than to any shark) with a lighter shade of blue on the Pectoral fins and has a white bottom jaw, as well as the well known "tooth whirl" on the bottom jaw.
Until recently were it's "buzz saw" appendage was placed was a subject of debate.