Scleractinia
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Scleractinia, also called stony corals or hard corals, are marine animals in the phylum Cnidaria that build themselves a hard skeleton. The individual animals are known as polyps and have a cylindrica
Diagram showing a coral polyp, its corallite, coenosarc and coenosteum
Diploria labyrinthiformis, a brain coral
Meandering corallite walls of an intratentacular budding coral
Cnidaria
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Cnidaria is a phylum of animals containing over 11,000 species of aquatic invertebrates found both in freshwater and marine environments, including jellyfish, hydroids, sea anemones, corals and some o
Pacific sea nettles, Chrysaora fuscescens
Oral end of actinodiscus polyp
Cerianthus filiformis (Ceriantharia)
Sea anemones (Actiniaria, part of Hexacorallia)