The bobbit worm, a type of segmented worm that hunts for fish at night.

My new candidate for the creepiest-looking marine animal -- way too many mouth-parts.

(Aer Prang 1, Lembeh Strait, Sulawesi, Indonesia)

worm; segmented worm; bobbit worm; Annelida; Polychaeta; Aciculata; sub-order Eunicida; Eunicidae; Eunice aphroditois, South Pacific