Cnidarians
Cnidarians such as jellyfish and corals have stinging cells called nematocysts. When touched they eject barbed threads tipped with poison.
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If you spot a splash of electric blue drifting along the shoreline, it's probably not a plastic bag. That pulsing blob is likely either a Portuguese man-of-war or a blue jellyfish, one of the most striking marine invertebrates you can find floating near beaches in the Northern Hemisphere (primarily in the North Atlantic region).
By Nico Avelle
Freshwater jellyfish may sound like an oxymoron—because jellyfish live in the ocean, right? Not all of them. Craspedacusta sowerbii, also called the peach blossom jellyfish, thrives in rivers, lakes and even gravel pits.
By Nico Avelle
Moon jellyfish might look like ghostly saucers adrift in the blue, but they're more than just ocean ambiance. These translucent animals, known scientifically as Aurelia aurita, are part of a family of jellies that have lives perfectly tuned to drifting through the sea.
By Nico Avelle
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How do jellyfish reproduce? That depends on which jellyfish you mean.
By Nico Avelle
There are about 200 documented species of jellyfish pulsing their way through the world's waters. Most range from the size of your belly button to the size of a car tire.
The immortal jellyfish, known as Turritopsis dohrnii, has the ability to reverse age and theoretically live an eternal life. Because of its ability to regrow its cells, it could theoretically escape death over and over again.
By Ada Tseng
While swarm of jellies may look serene, you're best off keeping your distance. A sting from the most dangerous jellyfish on Earth can be deadly. Even when we're not looking at the most dangerous, many jellyfish species have venomous stings that can cause everything from mild discomfort to serious pain.
By Talon Homer
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The life cycle of jellyfish can seem almost otherworldly. Some species are the closer to actual immortality than anything else we see in the animal kingdom!
By Mack Hayden
Most jellyfish are more bothersome than threatening, but the box jellyfish is so poisonous you might not make it out of the water alive.
Sea lice aren't actually lice - they're jellyfish - but they're no fun when they get in your bathing suit.
Don't think you have much in common with a jellyfish? What researchers just discovered may surprise you.
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You're going on vacation to a place where jelly fish stings are a common occurrence and you want to know how to treat a jellyfish sting. This article will tell you how to treat a jellyfish sting.
As you observe jellyfish twirl underwater, it's difficult not to be mesmerized by their graceful movements. But if their tentacles touch your skin, you'll regret being anywhere near these gelatinous blobs.
How do coral polyps mere millimeters in length form the world's largest living structures? Will these giants of the sea last much longer if the present rate of destruction continues?
Although jellyfish have been around for over 650 million years, they're still very mysterious. Learn the all about the fascinating jellyfish life cycle.