• hollow central cavity
• have stinging cells
• 2 cells thick
• radial symmetry
• one body opening for food and wastes
• nerve net
• reproduce asexually (budding) and sexually (egg and sperm)

polyp stage: tubular bodies with a mouth that is usually surrounded by tentacles

medusa stage:  example is the  adult jellyfish,  free swimming or floating. They
usually have umbrella-shaped bodies

Examples :

• hydra - polyp form, freshwater
• coral- soft bodied with hard coverings, live in colonies
• jellyfish- medusa, poisonous
• sea anemones- polyp form, stuns fish