H/t to Carl Zimmer.
Credit: Michael Skrepnick
Paleontologists have long thought of the coelacanth as a stodgy old slowpoke: Two modern-day species of the fish—considered living fossils because of their remarkable similarity to ancient coelacanths—typically swim in a slow, almost dawdling manner. As a group, coelacanths had apparently kept the same basic body plan for hundreds of millions of years. But now, researchers have found fossils of a sleeker coelacanth—one that likely was a speedy, shark-like predator in the ancient seas west of the supercontinent Pangaea about 240 million years ago.