BIS2C%20Lecture2031%20Fall%2010

BIS2C%20Lecture2031%20Fall%2010 - Fall 2010 Lecture 31....

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Fall 2010 Lecture 31. Mollusca introduction to Mollusca major features biology within-group diversity (4) Students should be able to: describe the body plan of a grazing mollusc outline the 4 functions of the mantle define members of 4 major molluscan classes explain how the basic body plan is modified across the 4 mollusc groups discussed analyze morphological evolution to identify the class with the greatest number of derived features
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Molluscan diversity ~90,000 living species (70,000 fossil species)
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Molluscan diversity range in size from microscopic to very large (giant squid can achieve 900 kg)
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Mollusca General summary Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… complete gut reduced coelom open circulatory system (hemocoel) in most well developed nervous system (especially in cephalopods) excretory system in form of nephridia
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Four Features • trochophore larva • mantle (4 functions) • foot • radula ( inside mouth ) only 3 synapomorphies here
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BIS2C%20Lecture2031%20Fall%2010 - Fall 2010 Lecture 31....

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