The filetail catshark gets its common name from the toothlike projections on its skin. Catsharks in general are relatively small, usually 12 to 39 inches long (30-100 cm), with flat heads and long, catlike eyes. Their teeth are very small and they have several rows of teeth in each jaw.
When a light shines on a catshark’s eyes, they glow—much like a cat’s eyes do. That’s because cats and sharks have special light-sensitive eyes designed for hunting in near-darkness. A catshark is always on the prowl. When a fish or squid swims nearby, the catshark lunges with its mouth wide open—and makes a quick meal of its prey.