27-1 Mollusks - The Burge · 2020-03-28 · 27-1 Mollusks I. What is a Mollusk? A. Phylum Mollusca...
Transcript of 27-1 Mollusks - The Burge · 2020-03-28 · 27-1 Mollusks I. What is a Mollusk? A. Phylum Mollusca...
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27-1 Mollusks
I. What is a Mollusk?A. Phylum Mollusca Origin: from Latin Molluscus = softB. Contains animals that look and act very differently from each otherC. Mollusks: Soft-bodied animal that have an internal or external shellVIDEO
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II. Form and Function in Mollusks
A. Body plan have 4 basic parts:1. Foot 2. Mantle 3. Shell 4. Visceral Mass
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B. Foot1. Usually contains the mouth and other structures associated with feeding
2. Many different shapes:a) Flat -- for crawling
b) Spade-shaped -- for burrowing
c)Tentacles -- for capturing prey
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C. Mantle: Thin, delicate tissue layer that covers most of a mollusk�s body
D. Visceral Mass contains: Internal organs
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E. Radula:1. A tongue-shaped structure used in feeding2. A layer of flexible skin covered with tiny teeth3. Acts like sandpaper to scrape/tear off food
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F. Carnivores have a radula or sharp jaws; some produce poisons to subdue prey
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G. Filter feeders use gillsto sift food from water. Mucus and cilia on gills trap plankton and move it to mouth
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H. Respiration1. Aquatic species: use
gills inside the mantle
2. Land species: mantlecavity is lined with blood vessels, folded and kept moist so O2 can enter cells