Georgette Douwma / Upside down jellyfish (Cassiopeia andromeda) Lembeh, Sulawesi, Indonesia.

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

Suzi Eszterhas / Two Purple / Striped Jellyfish (Pelegia / Chrysaora colorata) Monterey Bay Aquarium, California, USA, Captive

David Shale / Deepsea Medusa jellyfish (Colobonema sp), Mid-Atlantic Ridge, North Atlantic Ocean

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

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

Stephane Granzotto / Diver with Jellyfish (Rophilema nomadica) Mediterranean sea, Israel. Invasive species.

David Fleetham / Upsidedown jellyfish (Cassiopea medusae) resting in water, Komodo, Indonesia.

Claudio Contreras / Upsidedown Jelly (Cassiopea frondosa), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January

Suzi Eszterhas / Comb Jelly (Leucothea pulchra), native to Pacific Ocean

Constantinos Petrinos / Jellyfish carry crab (Ethusa sp.) carrying Upside-down Jellyfish (Cassiopeia andromeda). Lembeh Strait, North Sulawesi, Indonesia.

Pete Oxford / Mangrove upsidedown jelly (Cassiopea xamachana) Lighthouse Reef Atoll, Belize.