Food for thought

In its aquatic stage, the dragonfly naiad is an ambush predator. This means it catches prey by staying very still and blending in with the habitat. When a small fish gets close, it snatches its prey with a lightning-fast burst of speed.

What anatomical feature of the dragonfly naiad is used for nabbing prey? How does the design of this anatomical feature make it the perfect tool for an ambush predator?