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Giant green anemone, Southern California
A stony coral in its natural habitat

Anthozoa are a class in the phylum Cnidaria. It includes the sea anemones and the corals. The class does not have a medusa larval stage in its development, unlike the rest of the phylum. Like all Cnidaria, their food-catching and defence make use of nematocysts, which are extremely effective stinging cells. These are some of the groups in the class:

  • Stony corals
  • Sea anemones
  • Sea pens
  • Soft coral
  • Sea whips and fans
  • Various extinct orders of corals