Marine Bio: Mollusks
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5 types of mollusks
- 1. bivalves
what's the structure of a bivalve?
what's an adductor muscle?
- helps the two shells hinged together.
- *clams, oysters and mussels have 2*
- *scallops have 1*
What's an ex. of a bivalves? give description.
- -the clam.
- Predators: sea stars and predatory snails.
why are mollusk shells hard?
calcium carbonate (CaCO3)
how do bivalves acquire get food?
through the siphon tube which has an incurrent siphon and an excurrent siphon. draws in water which include the food etc. *Filter Feeders*
What are some of the adaptations of a bivalve?
- -securing themselves to a substrate
- -mussels live in turbulent intertidal zones where there's a lot of wave action.
what allows a bivalve to stay on a hard substrate?
the byssal thread
why are dentists interested in oysters?
b/c of their lower shell which secretes a cement that adheres to rocks and other substrates.
how does a scallop move?
fastest bivalve and it moves by contracting and relaxing its large adductor muscle.
what's a gastropod?
marine snails. "stomach-foot"
what's the structure of a gastropod?
-single coiled shell.
how does a snail breathe?
takes in oxygen and water through its siphon.
what's a radula.
- the periwinkle has a ribbon-like, toothed structure that is used to scrape off and ingest algae.
how does a cone snail kill its predators?
harpoon-like radula which is used to spear prey and deliver poison.
How do snails reproduce?
Fertilization is internal/ development is external.
what are cephalopods?
how to cephalopods swim?
draws water in and collects in the mantle. Goes out through the siphon opposite direction.
how does a cephalopod capture its prey?
- uses tentacles, killing animals with a bite from its parrotlike beak.
- -octopus has paralyzing venom and food is digested through a one-way digestive tract.
how do cephalopods survive w/o an external shell?
speed and camouflage.
what are chromatophores?
special pigemented cells in the skin.
how do cephalopods reproduce?
fertilization internal, development is external.
- -no eyes, tentacles.
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