Helicoprion was a really weird fish. So weird, in fact, that it took over a century for paleontologists to figure out how the fish's tooth-studded whorl fit on the creature's body. The nature of what Helicoprion jaws actually looked like was only published a little more than a week ago, brought to life in wonderful restorations by artist and fish fanatic Ray Troll.

I don't think anyone was more ecstatic about having researchers finally figure out the arrangement of the Helicoprion dental equipment than Troll. He's been chasing the trail of the Permian fossil for years. ...