Mollusca

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Mollusca
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Basic Body Plan

• Muscular foot
• Gills
• Mantle may secrete a shell
• Visceral mass
• Many have a scraping Radula
• Trochophore larvae

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Molluscan Body Plan
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Molluscan Classes

• Amphineurea (Polyplacophora) Chitons
• Bivalvia (Pelecypoda)
• Cepahlopoda
• Gastropoda
• Phylum also include rarer classes (not covered in
  lab)
• Monoplacophora
• Scaphopoda

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Mollusca Evolution
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Chitons

• Eight Plates hinged together underneath skin
• Dorsally flattened
• Scrape algae off rocks with radula
• Marine

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Gumboot Chiton
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Bivalvia

• Mantle split in two- making two hinged shells
• Suspension feeders
• Incurrent- excurrent siphons bring water in /out
• Gills and palps collect and move particles to
  mouth

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Fresh water Larvae- Glochidia44
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Clam Anatomy
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• Intestine
• Heart
• Mantle
• Visceral mass
• Gills
• Foot

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Clam Gill 42
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Radula 40
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Clam Dissection
Gills
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Excurrent Siphon
Incurrent Siphon
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Heart- Open Circ. System
Pericardial cavity (Ceolom)
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Cephalopoda
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Gastropoda
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