Which shark's snout is elongated with teeth on both sides?

The sawshark has an elongated, saw-like snout edged with teeth on both sides. This rostrum helps the shark detect and disable prey, making it the defining feature behind its common name.

Sawsharks are small, bottom-dwelling sharks in the order Pristiophoriformes. Their snouts usually carry alternating teeth of different sizes and a pair of sensory barbels. They can sweep the rostrum through sediment or slash it from side to side to injure fish and uncover prey.

A frequent mix-up is the sawfish, which also has a toothed “saw.” Sawfish are rays rather than sharks, and their gill openings are underneath the head. Sawsharks have gill slits on the sides, like other sharks, and are generally much smaller. Hammerhead, goblin, and other sharks may have unusual head shapes, but none has the characteristic toothed rostrum of a sawshark.