Canadian Medical Guide > Organisms > Animals > Invertebrates > Cnidaria Terms and Definitions

Cnidaria

Medical Definition:	A phylum of radially symmetrical invertebrates characterized by possession of stinging cells called nematocysts. It includes the classes ANTHOZOA; CUBOZOA; HYDROZOA, and SCYPHOZOA. Members carry CNIDARIAN VENOMS.
Guide Notes:	poisoning: coord with CNIDARIAN VENOMS if pertinent

Cnidaria Categories.

	Anthozoa - A class in the phylum CNIDARIA, comprised mostly of corals and anemones. All members occur only as polyps; the medusa stage is completely absent.
	Cubozoa - The class of box jellyfish, in the phylum CNIDARIA, characterized by their cube shape, and considered the most venomous jellyfish.
	Hydrozoa - A class in the phylum CNIDARIA which alternates between polyp and medusa forms during their life cycle. There are over 2700 species in five orders.
	Scyphozoa - The class of true jellyfish, in the phylum CNIDARIA. They are mostly free-swimming marine organisms that go through five stages in their life cycle and exhibit two body forms: polyp and medusa.

Cnidaria Medical Definitions and Terms

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