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How do caecilians protect themselves?
Cnidarians are unique because they contain cnidocytes when no other organism does. Cnidocytes are cells inside the epidermis of the tentacles and these cells contain organelles called cnidea. There are different types of cnidea in cnidarians such as nematocysts which contain a stinging venom to paralyze prey and spirocysts which contain sticky threads to capture prey.
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.
