PYLUM:Cnidaria

• What is the alternative name for the phylum Cnidaria?

  Coelenterata
• Which organisms are included in the phylum Cnidaria?

  Jellyfish, blue bottles, sea anemones, and corals
• Where are most Cnidarians found?

  In sea water
• What is a notable exception of Cnidarians that can be found in fresh water?

  Hydra
• What type of body plan do Cnidarians have?

  A simple body plan
• How is the body of Cnidarians structured in terms of symmetry?

  Radially symmetrical
• What are the two layers of cells in the body wall of Cnidarians?

  Ectoderm and endoderm
• What is the jelly-like layer found between the ectoderm and endoderm in Cnidarians?

  Mesoglea
• What does it mean for Cnidarians to be diploblastic?

  They have two layers of cells
• What is the central cavity in Cnidarians called?

  Coelenteron
• How many openings does the coelenteron have?

  One opening, the mouth
• Why are Cnidarians considered acoelomate animals?

  They have no coelom
• What role does the water in the coelenteron play?

  It acts as a hydrostatic skeleton and aids in transport and digestion
• What type of skeleton do corals have?

  A protein-like or calcareous skeleton
• What are the two basic body forms of Cnidarians?

  • Polyp
  • Medusa