Unheimlich

The Umbrella mouth gulper uses a whip-like tail for movement. The end of the tail bears a complex organ with numerous tentacles, which glows pink and gives off occasional bright red flashes. This is presumably a lure to attract prey, although its presence at the far end of the body from the mouth suggests that the eel may have to adopt an unusual posture to use it effectively...

It grows to about 1 metre (3.3 ft) in length and is found in all tropical and subtropical seas at depths ranging from 900 to 8,000 meters (3,000 to 26,200 feet).

(from Wikipedia)