Phylum Mollusca

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Phylum Mollusca
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Slug
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Snail
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Clam
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Oyster
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Scallop
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Octop.
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Shell Lab
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Phylum Mollusca
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Three Classes

• Bivalves clams, oysters, scallops
• Gastropods snails
• Cephalopods octopus, squid

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Common Characteristics

• Specialized foot
• Mantle covers and encloses, makes shell
• Radula scraping organ for feeding

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Shell

• Grows with animal
• Internal or external
• Adductor muscles hold together

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Internal clam
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Side clam
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Clam shell
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Bivalve Feeding

• Filter feeders
• Siphon tubes
• Incurrent
• Excurrent
• Mucus traps food moved to mouth

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Bivalve Respiration

• Water from incurrent siphon across gills

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Pearls

• Irritant between mantle and shell oyster walls
  off foreign particle with nacre
• Cultured vs. natural

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Gastropods

• Flattened foot
• Radula for feeding
• Digestion mouth to anus
• Respiration water through siphon tube

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Cephalopods

• Swim via propulsion
• Thin inner shell
• Tentacles capture food
• Suction disks to help hold food or crawl on sea
  floor

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Protection

• No outer shell
• Camouflage via chromatophores
• Ink cloud

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Label diagrams
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Gastropod and bivalve worksheet
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Squid lab
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Mussel lab