#polyp structure
- Anthozoan — A marine invertebrate belonging to the class Anthozoa, phylum Cnidaria, living exclusively in the form of a solitary or colonial polyp fixed onto a solid substrate (such as corals and sea anemones), completely lacking the free medusa stage. This organism possesses a cylindrical body whose oral opening is structurally surrounded by tentacles equipped with cnidocytes, being the primary builder of barrier reefs through the secretion of a hard calcareous exoskeleton.