Phylum: Mollusca

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Phylum Mollusca
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• Snail, oyster, squid, octopus, slug, chiton

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Characteristics

• Soft body (yummy part!)
• Muscular system Muscular foot (movement)
• Visceral mass (contains organs)
• Most have a shell
• Produced by the mantle

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• Have a true body cavity (coelom)
• Reproductive System Most reproduce sexually
• Most have an open circulatory system
• Not all blood moves in vessels
• Excretory System Nephridia

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Three Main Classes

• Gastropoda
• --stomach foot
• --snails, slugs, conchs
• --Respiratory system gills
• --have a tongue with teeth..radula
• --Herbivoreeats plants

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2. Bivalvia

• two shells
• Clams, oysters, scallops, mussels
• Filter feeders
• Found in fresh
• and salt water

Page 533 Eyespots
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3. Cephlapoda

• head foot
• Octopus, squid, nautilus, cuttlefish
• Highly developed nervous system
• CLOSED circulatory system

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• Predators
• Can change color
• Squirt ink for protection
• Have eyes like us
• Tentacles with suction cups
• Squid 10
• Octopus 8

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The Chambered Nautilus

• Chambered shell
• Animal lives in outer chamber
• Other chambers are filled with gas to control
  animals depth