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20 Cards in this Set
- Front
- Back
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Which superphylum does Phylum Mollusca belong to? |
Superphylum Lophotrochozoa |
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Describe the body plan molluscs have. |
Soft bodies, usually encased in a hard shell made of calcium carbonate. |
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What kind of a coelom do molluscs have? |
A reduced coelom |
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What is a foot? |
A muscle used for movement |
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What is a viceral mass? |
The part of the mollusc that contains most of the internal organs |
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What is the mantle? |
A fold of tissue that drapes over the visceral mass and secretes a shell |
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What is a mantle cavity? |
A water-filled chamber that houses the gills, anus, and excretory pores |
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What is a radula? |
A tongue-like feeding organ in the mouth that hosts a belt of backwards-curved teeth |
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What kind of a digestive system do they have? |
Complete, differentiated |
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Name molluscs' respiratory mechanism. |
Gills |
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Describe molluscs' circulatory mechanism. |
Open circulatory system- blood dumps into a pool and circulates oxygen |
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Describe molluscs' nitrogen waste removal mechanism. |
Nephridium- rudimentary kidney, which also works on water balance |
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How do molluscs reproduce? |
Spawning, have separate sexes |
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Where does fertilization take place? |
Internally |
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What class or classes belong in Phylum Mollusca? Name examples of each. |
Class Bivalvia: clams, oysters, scallops Class Gastropoda: snails, slugs- filter feeders Class Cephalopoda: squid, octopi, chambered nautilus |
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What do bivalves use to open and close their shells? |
Adductor muscles- one anterior and one posterior |
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What is special about the circulatory system of cephalopods? |
They are the only molluscs with a closed circulatory system. |
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What do squid and octopi produce in self defense? |
Ink |
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What is special about the nervous system in squid and octopi? |
They have well-developed eyes and a fully-developed brain. |
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How many tentacles do squid and octopi have? |
Squid- 10 Octopi- 8 |
