molluscs
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Molluscs
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Phylum Mollusca
Phylum Mollusca includes snails and slugs, oysters and clams, and octopuses and squids (~100,000 different species).
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Comparative Embryology
Molluscs have a mesoderm lined body cavity – a coelom.
Lophotrochozoans
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Humans & Molluscs
Humans use molluscs in a variety of ways:
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Humans & Molluscs
A few are pests or introduced nuisances:
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Mollusc Body Plan
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Head-Foot Region
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Head-Foot Region
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Head-Foot Region
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Shells
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Mantle Cavity
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Internal Structure & Function
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Mollusc Life Cycle
Most molluscs are dioecious, some are hermaphroditic.
The life cycle of many molluscs includes a free swimming, ciliated larval stage called a trochophore. Similar to annelid
larvae.
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Mollusc Life Cycle
The trochophore larval stage is followed by a free-swimming veliger larva in most species.
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Major Mollusc Classes
Four major classes of molluscs: Class Polyplacophora
– the chitons Class Gastropoda –
snails & slugs Class Bivalvia – clams,
mussels, oysters Class Cephalopoda –
octopus & squid
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Bivalvia Class
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Cephalopod Class
Show squid video
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Videos
Giant SquidSlug Sex