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Cnidaria, or cnidarians, is a phylum of aquatic invertebrates that includes animals such as jellyfish, corals, and sea anemones. They are characterized by their distinctive body structure, which typically features a simple body plan with radial symmetry, a gastrovascular cavity, and specialized cells called cnidocytes that contain stinging structures for capturing prey and defense. Cnidarians exhibit both polyp and medusa forms in their life cycles. They play essential roles in marine ecosystems, particularly in coral reef formation and as part of the food web.
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What does cnidarian mean?
Cnidiarian is the word for the phylum of jellyfish and sea anemomes. Some of the requirements to make it into the Cnidaria Phylum are possessing radial symmetry, having no nervous system or head but having a nerve net, and possessing nematocysts (which are stinging cells unique to cnidarians). Nematocysts are also called cnidea, which likely is the basis of the meaning of the name Cnidaria.
How do caecilians protect themselves?
Caecilians protect themselves by using camouflage to blend into their surroundings, some species also have toxic skin secretions to deter predators, and others can secrete a sticky, smelly substance from their skin when threatened to discourage predators from attacking.
