Ingo Arndt / Mastigias jellyfish (Mastigias sp) with mass of jellyfish in background, Jellyfish lake, Palau, Western Pacific Islands, Micronesia

Ingo Arndt / Mass of Mastigias jellyfish (Mastigias sp) in Jellyfish lake, Palau, Western Pacific Islands, Micronesia, March 2009

Claudio Contreras,Claudio Contreras / Jellyfish, Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Michele Westmorland / Snorkeler swimming with harmless Jellyfish (Mastigias papua etpisonii), Jellyfish Lake, Rock Islands, Palau, Micronesia.

Hiroya Minakuchi / Papuan Jellyfish (Mastigias papua), Palau

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Juergen Freund / Papua jellyfish {Mastigias papua}, Indo-Pacific

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Michael Pitts / Papua jelly fish with fish near tentacles, Palau, Pacific Ocean

David Fleetham / Papua jellyfish (Mastigias papua), Raja Ampat, Indonesia.

Ingo Arndt / Diver working underwater amongst mass of Mastigias jellyfish (Mastigias sp) in Jellyfish lake, Palau, Western Pacific Islands, Micronesia, March 2009

Ingo Arndt / Mass of Mastigias jellyfish (Mastigias sp) in Jellyfish lake, Palau, Western Pacific Islands, Micronesia