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08 Mollusca - Phylum Mollusca Snails clams squids etc...

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Phylum Mollusca Snails, clams, squids, etc. Monday, June 13, 2011
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Overview of the molluscs: the second peak in protostome evolution Monday, June 13, 2011
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Monday, June 13, 2011
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Monday, June 13, 2011
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Radial cleavage (indeterminate) Spiral cleavage (determinate) early, top early, side later 8-cell 16-cell Monday, June 13, 2011
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The hypothetical ancestral mollusc (HAM) (derived from comparative morphology and embryology) Monday, June 13, 2011
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Shell secretion by the mantle Monday, June 13, 2011
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Abalone shell, broken to show layerd nacre Monday, June 13, 2011
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An etched, stained cross section through the shell of a clam. prismatic layer nacreous layer Monday, June 13, 2011
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Evolution of the molluscan classes from HAM Monday, June 13, 2011
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Monday, June 13, 2011
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