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Biodiversity- Mollusks

Biodiversity- Mollusks. Sarah Whitebloom Matt Jones Eddie Frere. Objective: SWBAT describe what a mollusk is, the different types of mollusks, examples, and their functions Warm-Up. What is a mollusk? What are the 3 types of mollusks?.

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Biodiversity- Mollusks

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  1. Biodiversity- Mollusks Sarah Whitebloom Matt Jones Eddie Frere

  2. Objective: SWBAT describe what a mollusk is, the different types of mollusks, examples, and their functions Warm-Up • What is a mollusk? • What are the 3 types of mollusks? • An invertebrate with a soft, unsegmented body often enclosed in a hard shell containing calcium carbonate • Gastropoda, Bivalvia, Cephalopoda

  3. Notes- Mollusks • Mollusk- an invertebrate with a soft, unsegmented body often enclosed in a hard shell containing calcium carbonate • The body is divided into 4parts: foot, visceral mass, mantle, and shell

  4. The 4 types • Foot: it has different forms for different circumstances; flat structures for crawling, spade-shaped structures for burrowing, and tentacles for capturing prey • Visceral mass: below the mantle; consists of the internal organs • Mantle: thin layer of tissue that covers most of the body • Shell: made by glands in the mantle that secrete calcium carbonate(not found on all slugs and other mollusk groups)

  5. The Body

  6. Feeding Can be herbivores, carnivores, filter feeders, detritivores, or parasites Snails and slugs get their food using a flexible, tongue-shaped structure called the radula There are hundreds of tiny teeth attached to the radula Herbivores use it to scrape the algae off the rocks Carnivores use it to drill through shells of other animals Food is carried by water which enters through a siphon: a tube-like structure where water enters and leaves the body

  7. Circulation • The oxygen and nutrients are carried through the mollusk body by a circulatory system • It is either open or closed • Open circulatory system: blood is pumped through vessels by a heart • Open circulatory systems work best for slow-moving mollusks because the demand for oxygen is lower • Closed circulatory system: transport blood through an animal’s body much more quickly than an open circulatory system; better for faster- moving mollusks

  8. Gastropods • Shell-less or single-shelled mollusks that move by using a muscular foot located on the ventral side • Includes pond snails, land slugs, sea butterflies, sea hares, limpets, and nudibranchs

  9. Bivalves • Two shells that are held together by one or two powerful muscles • Includes clams, oysters, mussels, and scallops

  10. Cephalopods • Soft-bodied mollusks in which the head is attached to a single foot • The foot is divided into tentacles or arms • Most active mollusks • Octopi, squids, cuttlefishes, and nautiluses

  11. Activity

  12. Activity round 1 • Mollusk • Cephalopod • Gastropod • Bivalve • Radula • Open-circulatory system • Closed-circulatory system • Foot • Visceral mass • Mantle

  13. Activity round 2 • Good for slow moving mollusks • Octopi • Move with a muscular foot • Tiny teeth attached to the… • Blood pumped through vessels by a heart • Food is carried by water and enters through the… • Oxygen and nutrients carried through the body by a… • ____ drill through shells of other animals • ____ scrape algae off rocks • Two shells held together by one muscle

  14. Activity round 3 • Shell • Soft-bodied mollusks • Most active mollusks • Clams • Shell-less/single-shelled • Sea butterflies • Siphon • Below the mantle • Thin layer of tissue • Not found on slugs

  15. Wrap-Up What is a mollusk? What are the 3 groups? What are the 4 parts in the body plan?

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