marine ecology, april 9, 2007 invertebrates 2: phylum mollusca
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Marine Ecology, April 9, 2007
Invertebrates 2: Phylum Mollusca
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Phylum Mollusca:The “soft-bodied” animals
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Molluscan body plan Hypothetical ancestral mollusc (HAM)
Shell Mantle Mantle cavity Ctenidia Visceral mass Head and
assocated sensory structures
Radula Foot and epipodial
tentacles
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Class Polyplacophora: chitons “many plates”
Differences from HAM8 shell platesMantle cavity
expanded around footMultiple ctenidiaMantle grows over
shell, thickened (new functions?)
Reduced head without sensory structures
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Phylum Mollusca Class Polyplacophora Cryptochiton stelleri
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Phylum Mollusca Class Polyplacophora Katharina tunicata
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Phylum Mollusca Class Polyplacophora Tonicella lineata
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Phylum Mollusca Class Polyplacophora Mopalia muscosa
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Phylum Mollusca, Class Gastropoda: “stomach-foot”
Representative membersLimpets, snails,
abalones, nudibranchs
Diff. from HAMUndergo torsion
What is torsion? Advantages of
torsion Disadvantages of
torsion
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Phylum Mollusca, Class Gastropoda
Key: Gastropods undergo torsion!
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Phylum MolluscaClass Gastropoda
Diodora aspera
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Phylum MolluscaClass Gastropoda Lottia gigantea
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Phylum MolluscaClass Gastropoda Collisella digitalis
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Phylum MolluscaClass Gastropoda Collisella pelta
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Phylum MolluscaClass Gastropoda Tegula funebralis
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Phylum MolluscaClass Gastropoda Littorina sp.
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Phylum MolluscaClass Gastropoda Nucella sp.
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Phylum MolluscaClass Gastropoda Nudibranch (dorid)
Archidoris montereyensis
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Phylum MolluscaClass Gastropoda Nudibranch (dorid)
Rostangia pulchra
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Phylum MolluscaClass Gastropoda Nudibranch (dorid)
Discodoris (Dialula sandiegensis)
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Phylum MolluscaClass Gastropoda Nudibranch (aeolid)
Hermissenda (Phidiana) crassicornis
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Class Bivalvia: “two valves”
Representative members: Clams, mussels and scallops
Differences from HAMTwo shellsMantle/sensory structuresExpanded mantle cavityEnlarged ctenidia
Respiration AND feedingReduced headFoot more elongate;
Minimal area for suction
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Phylum MolluscaClass Bivalvia Mytilus
californianus Mytilus edulis