Unfortunately won't have time for anything except quick doodles today, but the Mayleozoic prompt is Helicoprion, and I wanted to pay homage to its many delightfully outdated reconstructions. They are like little guys to me.
[ID: Five cartoony, simplified drawings of different versions of Helicoprion, a shark-like animal with a whorl of sharp teeth. In each of the different reconstructions, the tooth whorl is in a different placement on the body. One of them has a lower jaw that ends in a spiral of teeth below its body, one has the tooth spiral at the end of its nose, and one has it at the end of one of its tail fins. There is also one whose body is notably small compared to its tooth whorl, which comes out of its mouth, and one with a saw-like projection of teeth at the end of a very long bottom jaw. Each of them has a different color and pattern, though all are done in shades of blue, gray, and brown. The background is light blue. End ID.]