旋齿鲨 / Helicoprion

My spiral tooth whorl makes your straight smile look positively sensible. Evolution tried some wild dental designs!
我的螺旋牙旋，让你整齐的笑容显得特别稳重。演化也试过狂野的牙齿设计！

Sources
How a shark used its saw-like jaw
https://www.nature.com/articles/513282c
Species reference
https://en.wikipedia.org/wiki/Helicoprion

Research context
Helicoprion evolved a remarkable spiral tooth whorl. Reconstructing its jaws reveals extreme specialization in a cartilaginous-fish branch, illustrating that vertebrate evolution repeatedly explored very different feeding solutions.