You're here: My Science Blogging » Animal World » Article: Jellyfish Can Be Colorful And Deadly
Yessi Pratiwi — May 22, 2009 / 7:35 pm
Jellyfish are free-swimming members of the phylum Cnidaria, that have several different morphologies that represent several different cnidarian classes including the Scyphozoa (over 200 species), Staurozoa (about 50 species), Cubozoa (about 20 species), and Hydrozoa.
They are not really fish. Jellyfish have stomachs and mouths, but no heads. They have nervous systems for sensing the world around them, but no brains. They are made almost entirely of water, which is why you can look through them.
Adult jellyfish are shaped like an open umbrella or a bell. Most jellyfish eat fish, tiny creatures called plankton, and even other jellyfish. Some jellyfish are very small, no larger than a marble. Others are quite large. The largest jellyfish can grow to about 7 feet (about 2 meters) across and weigh hundreds of pounds! Jellyfish may be blue, orange, pink, yellow, purple, and other colors. Some jellyfish can glow in darkness by making their own light. The light is made by a chemical reaction inside the jellyfish. Scientists believe jellyfish glow for several reasons. For example, they may glow to scare away predators or to attract animals they like to eat.
Credit : topnews
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