Cnidarians

• Cnidarian attributes

  • soft bodies
  • radial symmetry
  • 2 germ layers
  • locomotion: ripple in water
• cnidarians

  • jellyfish
  • sea anemone
  • corals
• jellyfish

  • free swimmers
  • tentacles that sting and capture prey
  • polyp and medusa stage
  • locomotion: pulsating their bell
• sea anemone

  • sessile
  • hydrostatic skeleton
  • they can sting
  • only polyp form
• corals

  • sessile
  • soft animals with stone-like coating
  • polyp form
  • exoskeleton
• cndarians have no true brain
• nerve net is a network of nerves that connects the brain to the rest of the body
• excretion and respiration is on cellular level
• cnidocytes are stinging cells of cnidarians
• polyp form


  cup shaped with a mouth and tentacles on one end and a basal disc on the other
• basal disc


  stick disc used for attaching
• medusa form


  umbrella shaped, free swimmers