Anthozoa
. In the Anthozoa class there is no medusa stage. An anthozoan polyp reproduces sexually, although the polyps of some species also reproduce asexually. Asexual reproduction results in a colony if the daughter polyps remain attached to one another. There are about 6,500 species of anthozoans, including corals, sea anemones, sea pens, and sea fans (see Gorgonian). Orange tube-coral Orange tube-coral does not grow in areas of dense coral development. Instead it thrives on the sides of boulders, underhangings, and drop-offs. This type of coral can also be seen in tide pools.