Chapter 39 Key Terms

• p. 842: Parazoa, Eumetazoa
  
• p. 843: sessile
  
• p. 844: osculum (plural, oscula), mesenchyme, spicules, spongin
  
• p. 845: mesoglea
  
• p. 846: medusae (singular, medusa), planulae (singular, planula), gastrovascular cavity, coelenteron, cnidocytes, nematocyst
  
• p. 848: dorsal, ventral, anterior, posterior
  
• p. 849: mesenteries
  
• p. 850: flame cells
  
• p. 851: hermaphroditic, miracidium (plural, miricidia)
  
• p. 852: rediae (singular, redia), cercariae (singular, cercaria), metacercariae (singular, metacercaria), sporocysts, scolex, neck, proglottids
  
• p. 856: stylets, pharynx
  
• p. 857: rotifers, parthenogenesis