class hirudinea notes
TRANSCRIPT
Phylum: AnnelidaPhylum: AnnelidaClass: HirudineaClass: Hirudinea
By Mr. “#1 AFC” ChapmanBy Mr. “#1 AFC” Chapman
Class: HirudineaClass: Hirudinea LeechesLeeches There are about There are about
500 species500 species Most freshwater, Most freshwater,
others are marine others are marine or terrestrial.or terrestrial.
Class: HirudineaClass: Hirudinea Leeches prey on small invertebrates Leeches prey on small invertebrates
or feed on the body fluids of or feed on the body fluids of vertebrates.vertebrates.
Class: HirudineaClass: Hirudinea Leeches lack two appendagesLeeches lack two appendages
– ParapodiaParapodia– HeadHead
HirudineaHirudinea The first anterior and posterior The first anterior and posterior
segements are modified into suckers.segements are modified into suckers.
HirudineaHirudinea Other annelids move like a snake Other 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 attach On land they use suckers to attach
and move forward.and move forward.
Hirudinea DigestionHirudinea Digestion Leeches feed on body fluids or entire Leeches 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 a They feed on living animals for a
short time and do not require them short time and do not require them for anything except foodfor anything except food
Leeches are more like a predatorLeeches are more like a predator
FeedingFeeding Leeches are class specific. Means?Leeches are class specific. Means? If they feed on a frog, they will only If they feed on a frog, they will only
feed on other amphibians, but not a feed on other amphibians, but not a fish or a reptile.fish or a reptile.
FeedingFeeding There salivary glands secrete an There salivary glands secrete an
anticoagulant, which prevents blood anticoagulant, which prevents blood from clotting.from clotting.– hirudinhirudin
If blood clot in leeches gut then it If blood clot in leeches gut then it would kill the leech.would kill the leech.
ReproductionReproduction Are hermaphroditicAre hermaphroditic Use a clitellum like Use a clitellum like
earthwormsearthworms