Phylum mollusca
Characteristics:
- Large ventral foot
- Visceral mass
- Dorsal mantle
- some have shells
- Clams, chitons, snails, slugs, squids, etc.
squid Lab
1. how are arms and tentacles similar and different: arms on the squid are for movement, while the tentacles are used for grabbing on to prey and bringing it to the mouth.
2. How are cephalopods similar and different from bivalves: Similar: have the foot, visceral mass, and mantle of all mollusca, belong to mollusca, and use gills to obtain oxygen from the water. Different: different classes, bivalves have 2 hard shells; squids have a flexible endoskeletal 'quill,' squids have tentacles, bivalves do not. squids have compound eyes, bivalves have no eyes at all.
3. was your squid a boy or a girl? how did you determine this: our squid was a male, it had a penis and did not have eggs in the ovaries at the posterior end.
4. trace the path of food through your squid: tentacle grabs on to prey, prey is bought to the mouth where the beak opens and eats the prey, the prey is sent to the stomach where it is digested, from the stomach to the intestine where the nutrients are drawn out, the mostly-digested food, now mainely waste is excreted out the anus, the waste is carried into the mantel, the liver produces enzymes and covers the mostly-digested food to further digest it.
5. why are the brachial hearts so close to the gills: the brachial hears are close to the gills to be most effective at getting oxygen into the bloodstream as well as dropping off CO2 as fast as possble.
2. How are cephalopods similar and different from bivalves: Similar: have the foot, visceral mass, and mantle of all mollusca, belong to mollusca, and use gills to obtain oxygen from the water. Different: different classes, bivalves have 2 hard shells; squids have a flexible endoskeletal 'quill,' squids have tentacles, bivalves do not. squids have compound eyes, bivalves have no eyes at all.
3. was your squid a boy or a girl? how did you determine this: our squid was a male, it had a penis and did not have eggs in the ovaries at the posterior end.
4. trace the path of food through your squid: tentacle grabs on to prey, prey is bought to the mouth where the beak opens and eats the prey, the prey is sent to the stomach where it is digested, from the stomach to the intestine where the nutrients are drawn out, the mostly-digested food, now mainely waste is excreted out the anus, the waste is carried into the mantel, the liver produces enzymes and covers the mostly-digested food to further digest it.
5. why are the brachial hearts so close to the gills: the brachial hears are close to the gills to be most effective at getting oxygen into the bloodstream as well as dropping off CO2 as fast as possble.