diagrams

• acoelomate

  
• coelomate

  
• pseudocoelomate

  
• radial cleavage

  
• spiral cleavage

  
• basic sponge anatomy

  A) ostium

  B) spongocoel

  C) osculum

  D) choanoderm

  E) pinacoderm

  
• basic sponge anatomy closer look

  A) choanocytes

  B) porocyte

  C) ostium

  D) pinacocyte

  E) mesohyl

  F) spicule

  
• ascon grade sponge (infolded choanoderm)

  
• leucon grade sponge (separate flagellated chambers)

  
• sycon grade sponge (folded choanoderm)

  
• medusa

  
• polyp

  
• scyphozoan medusae

  A) rhopalium

  B) mouth lobes

  C) GVC

  D) radial canal

  E) gonad

  F) mesoglea