27-4 Mollusks
trochophore• Free-swimming larval stage of an aquatic  mollusk
foot• Muscular part of a mollusk
mantle• Thin layer of tissue that covers most of a  mollusk’s body
Shell• Structure in mollusks made by glands in the  mantle that secrete calcium carbonate
Visceral mass• Area beneath the mantle of a mollusk that  contains the internal organs
radula• Tongue- shaped structure used for feeding by  snails and slugs
siphon• Tubelike structure through which water enters  and leaves a mollusk’s body
Open circular system• System in which blood is not always contained  within a network of blood vessels
Key Concept• Mollusks are soft- bodied animals that usually  have an internal or external shell.
Key Concept• The body plan of most mollusks has four  parts: foot, mantle, shell, and visceral mass
Key Concept• Gastropods are shell-less or single-shelled  mollusks that move by using a muscular foot  located on the vent...
Key Concept• Members of the class Bivalvia have two shells  that are held together by one or two powerful  muscles.
Key Concept• Cephalopods are typically soft-bodied  mollusks in which the head is attached to a  single foot. The foot is ...
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Biology 27.4

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Biology 27.4

  1. 1. 27-4 Mollusks
  2. 2. trochophore• Free-swimming larval stage of an aquatic mollusk
  3. 3. foot• Muscular part of a mollusk
  4. 4. mantle• Thin layer of tissue that covers most of a mollusk’s body
  5. 5. Shell• Structure in mollusks made by glands in the mantle that secrete calcium carbonate
  6. 6. Visceral mass• Area beneath the mantle of a mollusk that contains the internal organs
  7. 7. radula• Tongue- shaped structure used for feeding by snails and slugs
  8. 8. siphon• Tubelike structure through which water enters and leaves a mollusk’s body
  9. 9. Open circular system• System in which blood is not always contained within a network of blood vessels
  10. 10. Key Concept• Mollusks are soft- bodied animals that usually have an internal or external shell.
  11. 11. Key Concept• The body plan of most mollusks has four parts: foot, mantle, shell, and visceral mass
  12. 12. Key Concept• Gastropods are shell-less or single-shelled mollusks that move by using a muscular foot located on the ventral side.
  13. 13. Key Concept• Members of the class Bivalvia have two shells that are held together by one or two powerful muscles.
  14. 14. Key Concept• Cephalopods are typically soft-bodied mollusks in which the head is attached to a single foot. The foot is divided into tentacles or arms.

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