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

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Class Oligochaeta - “few bristles” - EarthwormsUsually burrow in soil - lack eyes - but have sensory systems thatdetect light, touch, and moistureHave fewer setae than polychaetes - important in burrowing foranchoring segments in burrowEat soil and organic debris - muscular gizzard grinds food -castings deposited at surface - increase soil aeration and porosityHermaphroditic - individuals meet - clitellum of each formsmucus ball around partners - exchange sperm - eggs depositedinto mucus ball - dries into “cocoon” - no larvae - fertilized eggshatch as small immature worms
Class Hirudinea - LeechesMost are freshwater, some terrestrial and marine - mostare predators or scavengers, some are parasitesLoss of septa between segments, most have no setaeHave suckers at both ends for prey capture, attachment,and locomotionHermaphroditic with mating similar to earthwormsleeches appear to have evolved from earthwormsExample: Hirudo medicinalisthe medicinal leech - aparasite - mouth haschitinous teeth, attaches,bites, secretes anticoagulant“hirudin” -leeches are used to removeblood from beneath skin aftersurgery and from some woundsHirudin is used to prevent clotformation during surgery
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 and 16: Phylum Annelida - Annelids - Segmen
Page 17 and 18: Segments are specialized for specif
Page 19: Class Polychaeta - Polychaetes -“

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

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