Content Outline for Teaching - Potosi School District - Home

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17 Section 3 Content Outline for Teaching Mollusks and Segmented Worms Invertebrate Animals Underlined words and phrases are to be filled in by students on the Note-taking Worksheet. A. Characteristics of mollusks—invertebrates usually with shells protecting their soft bodies, mantle, and muscular foot 1. Mantle—tissue that covers a mollusk’s soft body and that may produce a shell 2. Lungs or gills exchange carbon dioxide from the animal for oxygen in the air or water. 3. Many mollusks use a radula,ascratchy tongue-like organ, to help them eat. 4. Some mollusks have an open circulatory system which washes blood over organs and lacks blood vessels. B. Types of Mollusks 1. Gastropods—most have one shell a. Live in water or on land b. Move by gliding their large muscular foot along a trail of mucus 2. Bivalves—have two shells a. Large muscles open and close shell halves b. Water animals that filter feed c. Use gills to remove foot from water 3. Cephalopods—have no shell a. Have a foot divided into tentacles with suckers b. Move by using a mantle to quickly squeeze water through a funnel-like siphon c. Have a closed circulatory system with blood vessels C. Segmented Worms—also called annelids,have repeating segments, a closed circulatory system, and digest food in a complete system with two openings 1. Earthworms—have more than 100 body segments a. Use external bristle-like setae and muscles to move b. Eat organic material in soil c. Exchange carbon dioxide and oxygen through mucus-covered skin Invertebrate Animals 56
17 Content Outline for Teaching Invertebrate Animals (continued) 2. Leeches—have flat bodies with sucking disks at both ends a. Attach to animals and remove blood for food b. Can store enormous amounts of food for months 3. Marine worms—use bristles or setae for moving a. Some marine worms are filter feeders. b. Some eat plants or rotting material. c. Some marine worms are predators or parasites. Discussion Question What is the difference between an open and closed circulatory system? Open has blood oozing around organs; closed contains blood inside vessels Invertebrate Animals 57
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Content Outline for Teaching - Potosi School District - Home

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