Polyp's

A polyp is a tubelike water animal. Most polyps are marine animals, but few kinds live in fresh water. The polyp is one of the two basic forms of the large froup of animals called coelenterates (jellyfish). A polyp has a closed end, or foot, by which the animal is attached to the bottom of the body of water in which it lives. It can also attach itself to another polyp. The other end which is unattached has a opening, or a mouth, that is usually fringed by numerous tentacles.

Polyps may be found singly, as in the hydra, or in colonies such as the corals. In some kinds of coelenterates, the polyp form alternates in the animal's life cycle with the second basic form, the medusa, or jellyfish. Polyps belong chiefly to the classes Hydrozoa and Anthozoa of the phylum Coelenterata.