molluska & annelida notes
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MolluscaThe mollusks
One of the most diverse animal groups
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Bilateral
Coelom-fluid-filled body cavity; the space where the major organs are located
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Radula - a tongue with plates or “teeth” on it;used to scrape food into the mouth
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Mouth and Anus; called a “through gut”
Complete stomach and digestive system
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No skeleton; cavity gives shape; shell protects
Live everywhere!
“Foot” for moving/burrowing
Squid use jet propulsion (tentacles); VERY fast
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Name means “soft bodied”
There are 3 types:
Bivalves
Gastropods
Cephalopods
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Have a nervous systemGangliaNerve cords
Have an “open circulatory system”Blood is pumped to the spaces and diffuses through thecells
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Many are used for food by man
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AnnelidaThe segmented worms
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Bilateral
Tissues
Organs; organ systems
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True body cavity
True coelom
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Mouth and anus; through gut
Eat a wide range of material
Fertilize soil
Leeches have suckers and feed on blood
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Reproduce sexually
Are found nearly everywhere
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Complex nervous system
Nerve cords AND a brain!!!!!!!!!
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Closed circulatory system!!!Blood is pumped through the body through a complete system of tubes
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Creep along using muscles
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Nobody likes me, everybody hates meI’m gonna eat some worm (er er)sBig fat juicy ones, little tiny squirmy onesOh see how they do squirm (irm irm)First you bite the heads off, and then you suck the guts out, and then you throw the skins away(a a)Nobody knows how I eat wormstwenty-four hours a day (a a).