Sea anemones and corals: cnidarians that exist only as a polyp, permanently or semi-permanently attached to a surface, with no free-swimming medusa stage at any point in the life cycle. Anthozoa includes the reef-building stony corals whose calcium-carbonate skeletons form the physical structure of coral reefs worldwide.
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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 Anthozoa
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