Her ghostly glow reveals she isn't alone. Attached to her underside, her tiny "husband" — a parasitic mate that had fused himself to her belly — wafts in the water.

German researchers Kirsten and Joachim Jakobsen filmed this extraordinary scene with the Lula 1000, a deep-sea submersible diving off the coast of São Jorge Island in the Azores, about 850 miles (1,360 kilometers) west of Portugal. [In Photos: Spooky Deep-Sea Creatures]

Until now, researchers had never seen this species of anglerfish (Caulophryne jordani) alive. But the 25-minute-long video, taken at about 2,600 feet (800 meters) underwater, changes that.