PHYLUM MOLLUSCA Flashcards

1
Q

Where are molluscs typically found?

A

All major environment:

  • marine (all classes)
  • fresh water (gastropods & bivalves)
  • terrestrial (gastropods)
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2
Q

Describe the body plan of the phylum Mollusca.

A

Body has four largely independent regions:
- mantle (often w/ a shell)
- head
- foot
- viscera
Has 2 unique functionally important traits:
- ctenidium (gill) and radula

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3
Q

Describe the mantle found in the Phylum Mollusca.

A

Tissue layer that covers most or all of the body

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4
Q

How are new shells formed in molluscs?

A

The mantle adds new shell by accretionary growth at the edge of a tapered tube

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5
Q

Describe the mantle cavity found in molluscs.

A
Supports many functions:
- respiration (all)
- Feeding (some)
- locomotion (some)
- brood chamber (some)
Different forms in different taxa
Has unique ciliated gill bipectinate ctenidium(one to many depending on taxon)
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6
Q

What is the function of bipectinate ctenidium?

A

A unique ciliated gill that pumps water and plays an important role in suspesion feeding in some groups

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7
Q

What is the function of the radula?

A

Feeding structure

Flexible ribbon studded with many rows of chitinous teeth

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8
Q

Describe the two fluid-filled cavity that lie within the mesoderm.

A

Coelom: arise via schizocoely and is greatly reduced (only surrounds heart, gonad, kidney)
Hemocoel: extensive, blood is pumped by heart through vessels to spongy tissus
- fxn as circulatory system and hydraulic skeleton

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