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15 Cards in this Set
- Front
- Back
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general body structure |
-bilateral symmetry -coelom -complete digestive tract |
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what is the mantle? |
tough protective tissue that surrounds the internal organs, and secrete the shell in shelled mollusks |
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what is the radula? |
raspy tongue-like structure that is used for feeding |
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what type of nervous system do the have? |
simple nervous system, but some are advanced enough to have a brain and complex eyes |
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circulation if open? |
blood travels through the open body cavities |
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circulation if closed? |
blood travels through blood vessels |
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excretion |
nephridia removes wastes from the body |
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respiration |
ctenidia or primitive lung |
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what is a ctendia? |
filement gill system found in most mollusks (all aquatic species) |
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what is a primitive lung? |
formed in the mantle cavity of land snails and slugs |
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reproduction |
sexual |
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do they have separate sexes? |
most of the time yes |
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fertilization in aquatic species |
external |
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fertilization in terrestrial species |
internal |
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what are the classes? |
-gastropoda -Pelecypoda -Cephalophoda |
