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

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Circulatory system is open in mostHeart collects blood from gills and pumps to sinuses that extendthrough bodyCephalopods have a closed system of vessels and auxiliary heartsCoelom is primarily represented by small area around the heartNephridium forexcretion- collectsfluid from coelomand empties intomantle cavity -valuable solutesresorbed by wallsof tubule
ReproductionMost have separate sexes, some hermaphroditic, some change sex,most have internal fertilization, copulation between males andfemales (except in bivalves)<strong>Mollusks</strong> dispersed through larval formsMany have free-swimming trochophore larvaeA second free-swimming veliger stage may precede adult form
Page 3 and 4: Mollusk body plan: head-foot, visce
Page 5: All mollusks except Bivalves posses
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 and 16: Phylum Annelida - Annelids - Segmen
Page 17 and 18: Segments are specialized for specif
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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