Meet%20the%20Mollusks

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Photo credit MSC
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A Classroom Lesson

• from the
• Mathematics Science Center

Photo credit NOAA
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What is a Mollusk?
Photo credit NOAA
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Mollusks are Animals

• From the Latin Mollusca
• Soft-bodied
• Invertebrate
• 3 body parts Head, foot, mantle cavity

Photo credit USGS
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Sometimes with Shells
Photo credit USGS
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The Mantle

• Mantle secretes the shell and pearly lining
• Univalve 1 shell
• Bivalve 2 shells

Photo credits MSC
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Mollusks Movement

• Foot
• Muscular organ to move, dig, slide
• Radula
• Rasping tongue to obtain food or drill holes in
  other shells

Photo credit USGS
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More Mollusk Info.

• 2nd largest group of animals
• 100,000 known species
• Most are Marine , but can live in fresh water and
  on land
• Importance to man?

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Classification

• 7 Classes of Mollusks
• 3 Major Classes
• Gastropoda
• Snails, slugs, limpets
• Bivalvia
• Clams, oysters, scallops, mussles
• Cephalopoda
• Octopus, squid, nautilus

Photo credit NOAA
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Land Snail
Photo credit NOAA
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Aquatic Snails
Photo credits MSC
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Slug
Photo credit NOAA
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Banana Slug
Photo credit MSC
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Nudibranch
Photo credit MSC
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More Nudibranchs
Photo credits MSC
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Bivalves
Photo credit MSC
Photo credit NOAA
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Cephalopods
Photo credit MSC
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More Octopi
Photo credit MSC
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Squids
Photo credit MSC
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The Chambered Nautilus
Photo credits MSC
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Mud Snails

• Observe the mud snail specimens
• Identify the following structures
• Foot
• Siphon tube
• Tentacles
• Eyes
• Operculum
• Radula

Illustration credit MSC
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References

• MSC (Mathematics Science Center Slide
  Collection)
• NOAA (National Oceanic and Atmospheric
  Administration) Photo Library
• USGS (U.S. Geological Survey)
• Golden Guide Seashells of the World

Photo credit USGS