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EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > CNIDARIANS
Definition:
The name Cnidaria comes from the Greek word "cnidos", which means stinging
nettle (i.e. nematocysts). This phylum contains thousands of living species
worldwide. These creatures are radially symmetrical. There are four major
groups of cnidarians:
1) Anthozoa, which includes true corals, anemones, and sea pens;
2) Cubozoa, the amazing box jellies with complex eyes and potent toxins;
3) Hydrozoa, the most diverse group with siphonophores, hydroids, fire corals,
and many medusae; and
4) Scyphozoa, the true jellyfish.
Reference:
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