After reading this chapter and analyzing the content, it is assumed that you can: - Discuss the embryological development of the molluscan coelom and why the evolutionary development of a coelom was important.
- List characteristics of Mollusca that distinguish it from other phyla.
- Compare and contrast how each class of molluscs differs from the ancestral condition with respect to: shell, radula, foot, mantle cavity and gills, circulatory system, and head.
- Define the following: ctenidia, odontophore, periostracum, prismatic layer, nacreous layer, metanephridia, nephrostome, trochophore, veliger, glochidum, osphradium.
- Briefly describe the habits and habitats of a typical chiton.
- Define the following with respect to gastropods: operculum, columella, torsion, fouling, bilateral asymmetry, rhinophore, pneumostome.
- Discuss problems resulting from torsion and how gastropods evolved to avoid the problems.
- Distinguish between opisthobranchs and pulmonates.
- Briefly describe how a typical bivalve feeds and how it burrows.
- Describe how cephalopods swim and how they feed.
- Describe adaptations in the circulatory and neurosensory systems of cephalopods that are particularly valuable for actively swimming, predaceous animals.
- Distinguish between ammonoids and nautiloids.
- Demonstrate a knowledge of invertebrate groups likely to be the closest relatives of molluscs. State evidence to support and contradict the relationships.
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