Jain Biology: 3. Phylum Coelenterata:

Hydra, Jelly fish, Sea-anemone, and Corals are some examples of this phylum. They are aquatic, mostly marine, multicellular and radi-ally symmetrical animals; they exist in two forms—(i) a tubular body having anterior mouth or (ii) an umbrella shaped body with tentacles. There is a nervous system in the form of a nerve net formed of scattered nerve cells (protoneurons) and joined together by nerve processes. Reproduction is by asexual method (budding and fusion) and also by sexual method.