Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Christian Ziegler / Upside-down Jellyfish (Cassiopea xamachana) floating between the aerial roots of Red Mangrove (Rhizophora mangle), Twin Cays, Carrie Bow Cay, Belize

Pete Oxford / Upside-down Jellyfish (Cassiopea xamachana), Bonaire, Netherlands Antilles, Caribbean

Juergen Freund / Decorator crab (Dorippe frascone) with an Upside down jellyfish (Cassiopea andromeda) on its back. The jellyfish is bigger than the crab! Palawan, Philippines.

Jurgen Freund / Carrier crab (Dorippe frascone) with an upside down jellyfish (Cassiopea andromeda) on its back. The jellyfish is bigger than the crab! Palawan, Philippines

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp) pair on ocean floor, Jardines de la Reina National Park, Cuba

Georgette Douwma / Upside down jellyfish (Cassiopeia andromeda) on sea bed, Rinca, Komodo National Park, Indonesia, October

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

Juergen Freund / Upside down jelly free swimming (Cassiopeia sp) Caribbean

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} Kakaban Lake, Kalimantan, Indonesia

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Michael Pitts / Jellyfish {Cassiopeia sp} Florida Keys, USA.

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} about to be eaten by sea anemone, Indonesia,

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Kakaban Lake, Kalimanta

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) with symbiotic Algae (Zooxanthellae) in body, Caribbean

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) lies on bottom, symbiotic algae (Zooxanthellae) in body, Caribbean

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) in rare landlocked lake, Kakaban Island, Borneo

Juergen Freund / Up-side-down jellyfish {Cassiopeia sp} Indo-Pacific

Francis Abbott / Upside down jellyfish (Cassiopeia andromeda) Pacific, Yap, Palau.

Juergen Freund / Jellyfish {Cassiopea sp} Indo Pacific

Michael Pitts / Jellyfish resting on seabed {Cassiopeia sp} Florida Keys, FL, USA, North America Atlantic

Juergen Freund / Upside down jellyfish {Cassiopeia) Caribbean

Juergen Freund / Upsidedown jellyfish {Cassiopeia sp} + anemone in brackish water lake, Kalaban Is, Kalimantan, Indonesia. Anemones feed on jellyfish

Christian Ziegler / Upside-down Jellyfish (Cassiopea xamachana), Bastimentos Marine National Park, Bocas del Toro, Panama

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba