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15 Cards in this Set
- Front
- Back
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phylum Molluska
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Class Bivalvia - mussels, clams, oysters, scallops
Class Gastropoda - snails, slugs, conch, whelk, limpet Class Cephalopoda - squid, octopus, nautilus Class Polyplacophora - chitons |
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trochophore larva
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a ciliate, free-swimming larva common to several groups of invertebrates, as many mollusks and rotifers.
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hemocoel
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a cavity or series of spaces between the organs of organisms with
open circulatory systems. coelom is reduced to a small space around the hear. |
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mantle
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soft outer fold of tissue
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mantle cavity
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space enfolded by the mantle
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gills
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Two pairs of gills suspended in mantle cavity
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visceral mass
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solid tissue in which the internal organs are embedded
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foot
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extends from the visceral mass, can glide or burrow
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radula
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Scraping tongue
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Incurrent & Excurrent siphon
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-incurrent brings oxygen &food
-excurrent carries off wastes & gametes |
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labial palps
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move food to mouth
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operculum
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shelly plate that seals opening.
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nephridia
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the excretory organ consisting of a tubule with one end opening into the body cavity and the other opening into a pore at the body surface.
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open circulatory system
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Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
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torsion
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results in visceral mass being rotated 180 degrees. Gills located toward front, can withdraw into shell
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