SCOTLAND: The Big Picture / Maiden's salp (Thetys vagina) , west coast of Scotland, UK, July.

Juergen Freund / Salp (Salpidae) colony with diver in the background, North Sulawesi, Indonesia.

David Fleetham / Pelagic tunicate or salp (Salpa aspera) Hawaii.

Doug Perrine / Rover fish (Emmelichthyidae) juvenile sheltering inside a colonial salp at night in surface waters of deep ocean off Kailua Kona, Hawaii, USA.

SCOTLAND: The Big Picture / Amphipods (Amphipoda) living on a salp (Salpidae), Scotland, UK, July.

Tim Laman / Salp (Salpidae) floating on the currents of Cebu island, Philippines.

Richard Herrmann / Salp (Salpidae), San Diego, California

Richard Herrmann / Salp (Cyclosalpa affinis), Nine Mile Bank, San Diego, California

David Shale / Salp chain {Salpidae} Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Salp chain {Salpidae} Mid-Atlantic Ridge, North Atlantic Ocean

Richard Herrmann / Salp (Pegea sp) chain floating in open sea, San Diego, California

Richard Herrmann / Salp (Pegea sp) chain floating in open sea, San Diego, California