molluska & annelida notes

MolluscaThe mollusks

One of the most diverse animal groups

Bilateral

Coelom-fluid-filled body cavity; the space where the major organs are located

Radula - a tongue with plates or “teeth” on it;used to scrape food into the mouth

Mouth and Anus; called a “through gut”

Complete stomach and digestive system

No skeleton; cavity gives shape; shell protects

Live everywhere!

“Foot” for moving/burrowing

Squid use jet propulsion (tentacles); VERY fast

Name means “soft bodied”

There are 3 types:

Bivalves

Gastropods

Cephalopods

Have a nervous systemGangliaNerve cords

Have an “open circulatory system”Blood is pumped to the spaces and diffuses through thecells

Many are used for food by man

AnnelidaThe segmented worms

Bilateral

Tissues

Organs; organ systems

True body cavity

True coelom

Mouth and anus; through gut

Eat a wide range of material

Fertilize soil

Leeches have suckers and feed on blood

Reproduce sexually

Are found nearly everywhere

Complex nervous system

Nerve cords AND a brain!!!!!!!!!

Closed circulatory system!!!Blood is pumped through the body through a complete system of tubes

Creep along using muscles

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).