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jellyfish
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Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey
A deep red jellyfish of the genus Crossota with long, thin tentacles extending from its bell-shaped body, shown against a black background. Jellyfish belonging to the genus Cassiopea viewed from above. Crystal jellyfish, Aequorea victoria, float against a black background, their translucent bells showing glowing radial canals and long trailing tentacles. Translucent box jellyfish with long trailing tentacles, illuminated in blue light against a dark aquarium background. An ornate Cassiopeia jellyfish with a translucent bell and ruffled orange oral arms floats in clear blue water in Jellyfish Lake, Kakaban, Indonesia. A sea nettle jellyfish, Chrysaora fuscescens, with a translucent golden bell and long, trailing tentacles against a blue background. freshwater jellyfish Translucent jellyfish in the medusa stage with a rounded bell and long, trailing tentacles against a dark background. moon jelly
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jellyfish: Media

marine invertebrate
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Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey
A jellyfish contracting its body.
Video: Encyclopædia Britannica, Inc.
See the University of Melbourne's Medical Museum and learn about venomous animals, particularly snakes and jellyfish, and the development of antivenins
A discussion of venomous animals—particularly snakes and jellyfish—in Australia and...
Video: © University of Melbourne, Victoria, Australia (A Britannica Publishing Partner)

Images

A deep-sea jellyfish of the genus Crossota collected from the Canadian Basin...
Kevin Raskoff—NOAA/Census of Marine Life
Jellyfish belonging to the genus Cassiopea viewed from above.
Douglas Faulkner
Water jelly (Aequorea victoria)
The medusa stage of the bioluminescent water jelly or crystal jelly (Aequorea...
Denise Allen
box jellyfish
Deadly box jellyfish photographed in an aquarium.
© Daleen Loest/Dreamstime.com
Cassiopea
Cassiopea jellyfish.
© Andamanse/Dreamstime.com
Chrysaora
Sea nettle (Chrysaora fuscescens).
© Bobby Deal/RealDealPhoto/Shutterstock.com
freshwater jellyfish
Freshwater jellyfish (Craspedacusta sowerbyi).
U. S. Geological Survey
Medusa stage of a jellyfish
Tom McHugh/Photo Researchers
moon jelly
Moon jelly (Aurelia aurita).
© Vladimir Wrangel/Shutterstock.com
sea wasp
Sea wasp (Chironex fleckeri).
World Life Research Institute
Do jellyfish have a heart?
Jellyfish are marine invertebrates with simple body plans. They therefore lack complex...
© Aleksandr/stock.adobe.com
men unloading jellyfish in Malaysia
Men unloading jellyfish from a small boat near Bako, western Sarawak, Malaysia.
© Gini Gorlinski
early sea animals
Encyclopædia Britannica, Inc.
Life cycle of the common jellyfish Aurelia. Eggs released by females pass...
© Merriam-Webster Inc.