Alex Mustard / Planktonic pyrosome, drifting in blue sea. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Doug Perrine / Pyrosome, a type of pelagic colonial tunicate known for its bioluminescence, photographed at night, Kona, Hawaii, USA.

Pascal Kobeh / Pyrosoma / sea tunicate (Pyrosoma sp) in the open water at night, Palau, Philippine Sea

Aflo / Colonial tunicate (Pyrosoma spinosum) Komodo National Park, Indonesia.

David Shale / Colonial Tunicate {Pyrosoma SP}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Close up of Colonial Tunicate {Pyrosoma SP}, Mid-Atlantic Ridge, North Atlantic Ocean

Richard Herrmann / Salp (Pyrosoma sp), San Diego, California

Magnus Lundgren / Trevallly (Caranx sp), juvenile living in and around a tunicate (Pyrosoma sp) in the pelagic zone. Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean The Pyrosoma is a free-floating colo...

Magnus Lundgren / Brown paper nautilus (Argonauta hians) female drifting in the open ocean on a tunicate ( Pyrosoma sp.) Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean

Magnus Lundgren / Mototi octopus / poison occellate octopus, (Octopus mototi), drifting in the pelagic zone on a tunicate (Pyrosoma sp) Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean