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What is a jellyfish?
Watching them can make you wonder, what are they? Jellyfish are not really fish, of course, because a fish anatomy is centered around its backbone, whereas the jellyfish is a dome-shaped invertebrate. Therefore, it more accurate to refer to them simply as 渏ellies.?/div>What Are Jellyfish (Jellies)?
Are jellyfish invertebrates or vertebrates?
Only about five percent of the body of a jellyfish is solid matter; the rest is water. These simple invertebrates are members of the phylum Cnidaria, which includes creatures such as sea anemones, sea whips, and corals. Like all members of the phylum, the body parts of a jellyfish radiate from a central axis.
Do jellyfish have tentacles?
Jellyfish have tentacles that trail after them and sting prey. Jellyfish have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. The jellylike creatures pulse along on ocean currents and are abundant in cold and warm ocean water, in deep water, and along coastlines.
Why are jellyfish called cnidarians?
Therefore, animals in this phylum are called cnidarians. The cnidocytes on jellies?tentacles discharge venom from a sac called a nematocyst. These help them to capture floating prey in the water column. Jellies have limited control over their movement, using a muscle to propel themselves short distances by expanding and contracting their bell.