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

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Most forms are sedentary filter feedersFood particles collected on gills and entangled in mucus -cilia on gills convey food to mouthPlanktonic larval stage (trochophore) allows dispersalScallops are unique, very mobile formsswim by open and closing shellAbundant in marine and freshwater habitatsFreshwater mussels distributed worldwideMore than 500 species live in lakes and rivers of North AmericaLarvae brooded in special pouch in gill chamberLarvae are parasites on fish - larvae are called glochidia
Class Cephalopoda - Octopus, Squid and NautilusActive predators - most lack external shell (except Nautilus)Foot has evolved into a series of tentacles8 in octopus, 10 in squid, up to 90 in NautilusTentacles snare prey, beaklike jaws bite, radula pulls prey intomouth
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: Class Bivalvia - BivalvesIncludes c
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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