This highly unusual predator is a type of anglerfish, commonly known in this case as a "frogfish".

Anglerfish get their name from their use of a specialized fleshy appendage it may wiggle like a fishing lure to assist in attracting prey (this specimen has its lure positioned directly between the eyes). As with many anglerfish, this specimen is also a master of disguise, enabling it to surprise its prey. When a victim fish passes in range, it lunges with surprising speed to engulf its prey in one gulp.