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Class Bivalvia

Class Bivalvia. Bivalve mollusks have two shells (valves ). Use muscles to close valves Mussels, clams, oysters, scallops, shipworms Mostly filter feeders No head or radula. Class Bivalvia. Scallops have a row of small blue eyes along the mantle edge. Class Bivalvia.

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Class Bivalvia

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  1. Class Bivalvia • Bivalve mollusks have two shells (valves). • Use muscles to close valves • Mussels, clams, oysters, scallops, shipworms • Mostly filter feeders • No head or radula

  2. Class Bivalvia • Scallops have a row of small blue eyes along the mantle edge

  3. Class Bivalvia • Like other mollusks, bivalves have an open circulatory system. • They breathe and filter feed through gills

  4. Class Bivalvia • Incurrent and excurrent siphons are used to pump water through the organism for: • Gas (O2) exchange • Filter feeding • Jet propulsion

  5. Class Bivalvia - Locomotion • Bivalves move around by extending the muscular foot between the shells. • Scallops swim by clapping their shells together to create jet propulsion. • Can secrete sticky byssal threads to attach to rocks & other surfaces http://www.youtube.com/watch?v=u_RfgvIETEY&feature=related http://www.youtube.com/watch?v=vmi_I8QW5eo

  6. Oysters produce pearls • https://www.youtube.com/watch?v=T18E58vOTus • Oysters secrete shiny layer of calcium carbonate to coat irritating particles or parasites

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