Cnidarians, in the phylum Cnidaria, include organisms such as the jellyfish, corals, and sea anemones. These animals are found in shallow ocean water.
The body plan of cnidarians is unique because these organisms show radial symmetry, making these animals very different from those that evolved before them. Radial symmetry means that they have a circular body plan, and any cut through the center of the animal leaves two equal halves.
The cnidarians have two basic body forms:
1.Polyp: The polyp is a cup-shaped body with the mouth facing upward, such as a sea anemone and coral.
2.Medusa: The medusa is a bell-shaped body with the mouth and tentacles facing downward, such as a jellyfish.
The inside of a cnidarian is called the gastrovascular cavity, a large space that helps the organism digest and move nutrients around the body.
Cnidarians have radial symmetry and true tissues.
Some cnidarians form colonies, such as corals.
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