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Phylum Mollusca Fig. 16.CO
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Phylum Mollusca Large and diverse group of animals Tridacna gigas
Giant Clam Tridacna squamosa Fluted Giant Clam
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Phylum Mollusca More than 500,000 known species Class Polyplacophora
Gastropoda Class Bivalvia Class Cephalopoda chitons Snails Sea slugs nudibranchs Squid Octopus Cuttlefish Nautilus clams More than 500,000 known species
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Phylum Mollusca Soft Bodied Shelled Cephalization Body Divisions
Some without Cephalization Body Divisions Visceral Mass- contains most of the internal organs Muscular Foot- for movement Mantle- houses gills Fig. 16.1a Tonicella lineata
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Generalized Mollusc Anatomy
mantle visceral mass foot
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Phylum Mollusca Complete digestive tract Digestive glands
Octopus briareus Complete digestive tract Digestive glands Specialized feeding structures Circulatory system Heart (2 chambers) Open system in most groups Closed in cephalopods
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Phylum Mollusca Advanced nervous system Excretory system Reproduction
Brain Sensory organs Eyes (simple and camera) Sensory papillae Excretory system Kidney Reproduction Male or Female parts Some are hermaphrodites External & internal fertilization
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Mating Fig
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Mollusc Taxonomy Polyplacophora Major classes Chitons
Chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell plates Major classes Polyplacophora Chitons
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Mollusc Taxonomy Gastropoda Major classes Subclasses: Prosobranchia
Atlantic triton’s trumpet (Charonia variegata) Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Sea Snails Tiger cowrie (Cypraea tigris)
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Mollusc Taxonomy Gastropoda Major classes Subclasses: Opisthobranchia
Spotted sea hare (Aplysia dactylomela) Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Opisthobranchia Sea slugs (marine) Phidiana hiltoni zebra sea goddess (Hypselodoris zebra)
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Mollusc Taxonomy Gastropoda Major classes Subclasses: Pulmonata
Helminthoglypta walkeriana Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Opisthobranchia Pulmonata Terrestrial snails/slugs Freshwater snails Giant banana slug (Ariolimax columbians)
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Mollusc Taxonomy Bivalvia Major classes Polyplacophora Gastropoda
Bay scallop (Aequipecten irradians) Major classes Polyplacophora Gastropoda Bivalvia Clams, oysters, mussels, scallops Edible mussels (Mytilus edulis) Ostrea edulis
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Mollusc Taxonomy Major classes Cephalopoda Polyplacophora Gastropoda
Giant cuttlefish (Sepia latimanus) Major classes Polyplacophora Gastropoda Bivalvia Cephalopoda Octopus, squid, nautilus Octopus sp Nautilus sp
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Mollusc Taxonomy Major classes Minor classes Polyplacophora Gastropoda
Bivalvia Cephalopoda Minor classes Monoplacophora Solenogastres Caudofoveata
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A Pearl Among the Swine Fig. 16.5b
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Gastropod Veliger Larva
Mouth Velia Fig. 16.7 Shell
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Veliger Zygote Trochophore Juvenile Spat Adult
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Adult Abalone Fig a
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Class Gastropoda - Torsion
Fig
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Gastropod Shell Coiling
Fig
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Gastropod Gill/Mantle Cavity Evolution
Fig
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Marine Gastropods Cowries Fig b
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Marine Gastropods Sea Hare – Aplysia sp Fig
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Marine Gastropods - Nudibranch
Fig
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Squid are the largest Cephalopods
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Nautilus Anatomy Fig b
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Direct Development in Cephalopods
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Color & Morphology Changes for Camouflage
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