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Marine Ecology, April 16, 2008 Intertidal Organisms, Part B: 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 HAM 8 shell plates Mantle cavity expanded around foot Multiple ctenidia Mantle 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 members Limpets, snails, abalones, nudibranchs Diff. from HAM Undergo torsion What is torsion? Advantages of torsion Disadvantages of torsion
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Phylum Mollusca Class Gastropoda Diodora aspera
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Phylum Mollusca Class Gastropoda Lottia gigantea
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Phylum Mollusca Class Gastropoda Collisella digitalis
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Phylum Mollusca Class Gastropoda Collisella pelta
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Phylum Mollusca Class Gastropoda Comparison of common limpets Copyright © 2006 Mary Jo Adams
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Phylum Mollusca Class Gastropoda Tegula funebralis
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Phylum Mollusca Class Gastropoda Littorina sp.
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Phylum Mollusca Class Gastropoda Nucella lamellosa
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Phylum Mollusca Class Gastropoda Nucella canaliculata (Photo by: Dave Cowles July 2005) Photo: Derrick Ditchburn
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Phylum Mollusca Class Gastropoda Nucella emarginata nathistoc.bio.uci.edu/Molluscs/index.htm Copyright © 2006 Mary Jo Adams Photos Ari Kornfeld, copyright © 1996-2001.
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Phylum Mollusca Class Gastropoda Nudibranch (dorid) Acanthodoris nanaimoensis Photos courtesy of Ari Kornfeld, copyright © 1996-2001.
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Phylum Mollusca Class Gastropoda Nudibranch (dorid) Archidoris montereyensis
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Phylum Mollusca Class Gastropoda Nudibranch (dorid) Rostangia pulchra
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Phylum Mollusca Class Gastropoda Nudibranch (dorid) Discodoris (Dialula sandiegensis)
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Phylum Mollusca Class Gastropoda Nudibranch (aeolid) Aeolidia papillosa Copyright © 2005 Mary Jo Adams
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Phylum Mollusca Class Gastropoda Nudibranch (aeolid) Hermissenda (Phidiana) crassicornis
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Phylum Mollusca Class Gastropoda Nudibranch (arminacean) Janolus fuscus
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Class Bivalvia: “two valves” Representative members: Clams, mussels and scallops Differences from HAM Two shells Mantle/sensory structures Expanded mantle cavity Enlarged ctenidia Respiration AND feeding Reduced head Foot more elongate; Minimal area for suction
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Phylum Mollusca Class Bivalvia Mytilus californianus Mytilus trossulus (Mytilus edulis)
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