Aquatic, mostly marine invertebrates defined by cnidocytes, stinging cells used to capture prey and for defense, arranged around a body with radial symmetry and a single body opening. Cnidaria includes jellyfish, sea anemones, corals and hydroids, and reef-building corals in this phylum construct the physical structure of every coral reef on Earth.
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Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Cnidaria
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