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14 Cards in this Set
- Front
- Back
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Facts |
•soft bodied animals •usually have internal/external shell •ex: snails, slugs, clams, squids, octopi |
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Trochophore |
Free swimming larval stage |
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Radula |
Flexible, tongue shaped structure w/ tiny teeth |
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Siphon |
Tube - like structure which h2o enters & exits body |
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Body plan |
4 parts •foot •mantle •shell •visceral mass |
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Foot |
•Flat structure used for crawling •spade-like structure for burrowing •tentacles for catching prey |
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Mantle |
Thin layer of tissue that covers most of body |
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Shell |
•Made by glands in the mantle •secretes calcium carbonate |
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Visceral mass |
•Just beneath mantle •consists of internal organs |
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Feeding |
•herbivores, carnivores, detritivores, parasites, filter feeders •snails & slugs = use radula •octopi & some slugs use sharp jaws •clams, oysters & scallops r filter feeders w/ a siphon |
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Circulation |
•open/closed •closed circ sys for fast moving mollusks (squids & octopi) |
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Response |
•2 shelled mollusks have simple nerv sys •ganglia near mouth •few nerve cords •octopi have highly developed nerv sys |
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Movement |
•snails secrete mucus along base of foot •octopus use jet propulsion |
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Reproduction |
•snails & 2 shelled mollusks reproduce sexually •tentacled mollusks- fertilization takes place in female •some r hermaphrodites- fertilization eggs from another individual |
