Unit 5: The Evolutionary History of Diversity   Animations Extras  Study Guide

Chapter 33 Invertebrates Review Notes Point
  1. Invertebrates do not have a backbone , and account for 95% of known animal species.
     
     
     
     
  2. Phyla Calcarea and Silicea are the multicellular sponges (formerly Porifera) that lack true tissues.
     
     
     
     
  3. Phylum Cnidaria belongs in the clade with true tissues called Eumetazoa .
     
     
     
     
  4. Most Eumetazoa belong to the clade Bilateria and exhibit bilateral symmetry and triploblastic embryonic development.
     
     
     
     
  5. Phylum Platyhelminthes are flatworms with a gastrovascular cavity.
     
     
     
     
  6. Phylum Nematoda are roundworms with a pseudocoelom .
     
     
     
     
  7. Phylum Mollusca are soft-bodied animals.
     
     
     
     
  8. Phylum Annelida are segmented worms with a true coelom .
     
     
     
     
  9. Phylum Arthropoda have segmented bodies.
     
     
     
     
  10. Phylum Echinodermata are deuterostomes .
     
     
     
     
    Summary: