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
Segments are specialized for specific functionsAnterior segments for feeding and sensory input - one segmenthas a brain that can control ganglia of other segments -connected by two ventral nerve cordsOther segments contain hearts that distribute blood through aclosed circulatory system to all segmentsExcretion bysegmentalnephridia - emptycoelomic fluid tooutside and recoversolutesGas exchange occurs at body surface
Page 3 and 4: Mollusk body plan: head-foot, visce
Page 5 and 6: All mollusks except Bivalves posses
Page 7 and 8: ReproductionMost have separate sexe
Page 9 and 10: Class Gastropoda - Snails and Slugs
Page 11 and 12: Class Bivalvia - BivalvesIncludes c
Page 13 and 14: Class Cephalopoda - Octopus, Squid
Page 15: Phylum Annelida - Annelids - Segmen
Page 19 and 20: Class Polychaeta - Polychaetes -“
Page 21: Class Hirudinea - LeechesMost are f

Phylum Mollusca - Mollusks - includes snails, slugs, clams, scallops ...

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