Integrated Principles of Zoology 16th Edition by Cleveland Hickman,Susan Keen,Allan Larson,David Eisenhour,Helen I'Anson, Larry Roberts

Exercise 11

Briefly describe characteristics of the hypothetical ancestral mollusc, and tell how each class of molluscs (Caudofoveata, Solenogastres, Monoplacophora, Polyplacophora, Scaphopoda, Gastropoda, Bivalvia, Cephalopoda) differs from the ancestral condition with respect to each of the following: shell, radula, foot, mantle cavity and gills, circulatory system, and head.