Phylum Mollusca - Mollusks - includes snails, slugs, clams, scallops ...
Phylum Mollusca - Mollusks - includes snails, slugs, clams, scallops ...
Phylum Mollusca - Mollusks - includes snails, slugs, clams, scallops ...
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Segmentation is the key innovation for this groupSegments - modular structure - allows evolutionary and functionalflexibility - slight modifications result in new functionsEach segment is arelatively complete unit -each partitioned from theothers by septa,Each segment containsits own excretory organs,and nerve concentrationsthat control the actionsof the segment called“ganglia”Each segment can expand or contract independently - with circularand longitudinal muscles working around water-filled coelom
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