Biology, Eighth Edition (Raven)

Chapter 34: Coelomate Invertebrates

Learning Outcomes

• Understand the basic organization of a mollusk and the importance of the mantle.
• Describe the differences in body plan, reproduction, feeding, and respiration among the gastropods, bivalves, and cephalopods.
• Explain the advantages of segmentation in coelomic organisms and give an example of each phyla.
• Understand the basic organization of annelids and how their organ systems compare to those of mollusks.
• Indicate how the annelids are more advanced than the mollusks.
• Understand how earthworms, polychaetes, and leeches differ from one another.
• Describe lophophorates and indicate their relationships to protostomes and deuterostomes.
• Understand the necessity for segmentation and jointed appendages in the arthropods.
• Explain the structural and functional size limitations in the arthropods.
• Identify the major external features of arthropods that distinguish them from all previously presented animal phyla.
• Describe ecdysis as it applies to arthropods and understand why it is necessary.
• Understand the basic internal organization of the arthropods.
• Describe the diversity among the major groups: crustaceans, arachnids, centipedes/millipedes and insects.
• Describe the external and internal characteristics of the class Insecta.
• Describe the major differences between the orders of Insecta.
• Understand the complexities of insect metamorphosis and differentiate between simple and complete metamorphosis.
• Differentiate between protostomes and deuterostomes.
• Describe the general body plan of an adult echinoderm.
• Understand the importance of the echinoderm water vascular system.
• Describe regeneration in echinoderms and how it relates to reproduction.
• Differentiate among the six classes of echinoderms in terms of body plan, locomotion, tube feet modifications, reproduction, and feeding strategy.
• Contrast the classes of echinoderms.