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Class Hirudinea Notes
- 1. Phylum: AnnelidaPhylum: Annelida Class: HirudineaClass: Hirudinea By Mr. “#1 AFC” ChapmanBy Mr. “#1 AFC” Chapman
- 2. Class: HirudineaClass: Hirudinea LeechesLeeches There are aboutThere are about 500 species500 species Most freshwater,Most freshwater, others are marineothers are marine or terrestrial.or terrestrial.
- 3. Class: HirudineaClass: Hirudinea Leeches prey on small invertebratesLeeches prey on small invertebrates or feed on the body fluids ofor feed on the body fluids of vertebrates.vertebrates.
- 4. Class: HirudineaClass: Hirudinea Leeches lack two appendagesLeeches lack two appendages – ParapodiaParapodia – HeadHead
- 5. HirudineaHirudinea The first anterior and posteriorThe first anterior and posterior segements are modified into suckers.segements are modified into suckers.
- 7. HirudineaHirudinea Other annelids move like a snakeOther annelids move like a snake back and forth.back and forth. Leeches move up and downLeeches move up and down On land they use suckers to attachOn land they use suckers to attach and move forward.and move forward.
- 9. Hirudinea DigestionHirudinea Digestion Leeches feed on body fluids or entireLeeches feed on body fluids or entire bodies of invertebrates.bodies of invertebrates. Are leeches Parasites?Are leeches Parasites? – NONO They feed on living animals for aThey feed on living animals for a short time and do not require themshort time and do not require them for anything except foodfor anything except food Leeches are more like a predatorLeeches are more like a predator
- 10. FeedingFeeding Leeches are class specific. Means?Leeches are class specific. Means? If they feed on a frog, they will onlyIf they feed on a frog, they will only feed on other amphibians, but not afeed on other amphibians, but not a fish or a reptile.fish or a reptile.
- 12. FeedingFeeding There salivary glands secrete anThere salivary glands secrete an anticoagulant, which prevents bloodanticoagulant, which prevents blood from clotting.from clotting. – hirudinhirudin If blood clot in leeches gut then itIf blood clot in leeches gut then it would kill the leech.would kill the leech.
- 13. ReproductionReproduction Are hermaphroditicAre hermaphroditic Use a clitellum likeUse a clitellum like earthwormsearthworms