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Photo credit: MSC. What is a Mollusk?. Photo credit: NOAA. What are mollusks ? . Invertebrates Soft, unsegmented bodies Often but not always are covered by a shell Mantle – a thin layer of tissue that covers their internal organs

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what is a mollusk
What is a Mollusk?

Photo credit: NOAA

what are mollusks
What are mollusks?
  • Invertebrates
  • Soft, unsegmented bodies
  • Often but not always are covered by a shell
  • Mantle – a thin layer of tissue that covers their internal organs
  • Foot – an internal organ used for different uses based on the animal (ex. crawling, digging, catching prey)
the mantle
The Mantle
  • Mantle secretes the shell and pearly lining
  • Univalve: 1 shell
  • Bivalve: 2 shells

Photo credits: MSC

mollusks movement
Mollusks & Movement
  • Foot
    • Muscular organ to move, dig, slide…
  • Radula
    • A flexible ribbon of tiny teeth to obtain food

Photo credit: USGS

more mollusk info
More Mollusk Info.

* 100,000 known species

* Most are Marine , but can live in fresh water and on land

* Importance to man?

classification
Classification
  • 7 Classes of Mollusks
  • 3 Major Classes
    • Gastropods
      • Snails, slugs, limpets
    • Bivalves
      • Clams, oysters, scallops, mussels
    • Cephalopods
      • Octopus, squid, nautilus

Photo credit: NOAA

body structure
Body Structure:
  • Bilateral symmetry
  • One way digestive system