Jordi Chias / Atolla jellyfish (Atolla wyvillei) with Gentoo penguin (Pygoscelis papua) in the background near the surface. Antarctic Peninsula. Finalist in the Underwater category of the Wildlife Photographer of t...

Juergen Freund / Split level of large Purple crown jellyfish (Netrostoma setouchina) in shallows of mangroves. Mali Island, Macuata Province, Fiji, South Pacific.

Chris Newbert / Crown Jellyfish (Netrostoma setouchianum), Papua New Guinea

Doug Perrine / Crown jellyfish (Cephea cephea) with a juvenile drift fish sheltering within its venomous tentacles, hiding its head inside the jelly's mouth. In surface waters of deep open ocean at night, Kona, Hawa...

Franco Banfi / Thimble jellyfish (Linuche unguiculata) aggregation, My Paradise Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Franco Banfi / Thimble jellyfish (Linuche unguiculata) aggregation, My Paradise Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Franco Banfi / Thimble jellyfish (Linuche unguiculata) aggregation, My Paradise Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Juergen Freund / Purple crown jellyfish (Netrostoma setouchina) in shallow waters, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Split level of Purple crown jellyfish (Netrostoma setouchina) in shallow waters, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Split level of Purple crown jellyfish (Netrostoma setouchina) in shallow waters, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Purple crown jellyfish (Netrostoma setouchina) in the mangrove shallows, Nukubati Island Resort, Macuata Province, Fiji, South Pacific

Juergen Freund / Purple crown jellyfish (Netrostoma setouchina) in the mangrove shallows, Nukubati Island Resort, Macuata Province, Fiji, South Pacific