JELLYFISH FROM PHYLUM COELENTERATA...

Animals belonging to this phylum have a special cavity in their body called coelenteron and thus they are called coelenterates.They are diploblastic animals having in their bodies to layers of cell.Outer layer is called ectoderm and inner layer is called endoderm.Between these layers is a jelly like substance the mesoglea is present.Many animals are marine but some also live in fresh water.Hydra, jelly fish and sea anemone are common examples.

..........................................................JELLY FISH.....................................................................

This animal has a cup shaped body.It has a convex upper side due to which it is called cup animal.It ranges in size from 2 to 40cm.It is exclusively marine.Body is transparent and is thus not visible in water.Its shape is like an open umbrella.The mouth is centered on the lower side of the body at the end of a triangular structure called manubrium which is drawn out to form four oral arms with tentacles at their margin.Small floating animals (plankton) present at the surface of water are taken in as food with the help of tentacles.Jelly fish is found floating near the surface of water.Some jelly fish are very large in size with their tentacles reaching from 15 meters in length.