Bobbit worm with its jaws extended. Bobbit worms (Eunice aphroditois) are aggressive predatory polychaete worms that use their huge jaws (grey) to snatch at passing fish. Polychaetes are a class of annelid (segmented) worms. Each segment has a pair of fleshy un-jointed limb-like appendages (parapodia) which aid in locomotion. Photographed in the Lembeh Strait, Sulawesi, Indonesia.