Scientists spotted a rare jellyfish with huge ribbon-like arms deep in the ocean, where dozens of possible new sea species were also discovered.

During a dive off Argentina, scientists documented a rare jellyfish discovered a little over a century ago and seldom seen since, as well as the fish that keep it company.

A newly described blue jellyfish in Japanese waters has stunned researchers with an otherworldly glow that looks less like a familiar sea creature and more like a visitor from a science fiction epic.

A rare phantom jellyfish has been spotted by scientists exploring the deep sea near Argentina. Stygiomedusa gigantea, more commonly known as the giant phantom jellyfish, was filmed 250 metres below the surface in the South Atlantic Ocean.

Doctors have explained why you should never pee on a jellyfish sting as a giant phantom jellyfish is spotted off the coast of Argentina