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Second largest animal phylum
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Molluscs
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Body plan characteristics (4)
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Head, muscular, viscera mass and mantle
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Viscreal mass
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Contains digestive, reproductive and circulatory organ
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Mantle
What does it do? What does it hold?
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Secretes shell, contains gills or lungs
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Mollusca shell layers
What is it made of?
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Nacreous layers -> prismatic layer ->outer periostracum
-Made of calcium carbonate
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Polyplacophora
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Chitons
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How many shell plates in Polyplacophora?
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8
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Gastropod Torsion
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-primitive feature in class
-rotation of visceral hump brings mantle cavity anteriorly, twisting of visceral madd through 180 degree rotationg during development
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Planospiral shell
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New whorls added to outside of old ones (spirals on top), ancestral type
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Conispiral shell
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New whorls added to side of old ones (Spirals to side)
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Problem Torsion? Benefit of coiling?
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Torsion causes wastes to wash over gills, coiling reduces fouling because water enters on left, exit out right
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Dorsal hinge ligaments of bivalvia
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Connect the 2 shelled valves in bivalvia
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Adductor muscles of bivalvia
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Moves the 2 valves
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Protobranch gills
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Form in gastropods, chitons & cephalopods
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Eulamellibranch gills
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Form in bivalves, more evolved form, used for both gas exchange and feeding
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