Download - Class Bivalvia
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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
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Class Bivalvia• Scallops have a row of small blue
eyes along the mantle edge
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Class Bivalvia• Like other mollusks, bivalves have
an open circulatory system.• They breathe and filter feed
through gills
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Class Bivalvia• Incurrent and
excurrent siphons are used to pump water through the organism for:
1. Gas (O2) exchange
2. Filter feeding3. Jet propulsion
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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
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Oysters produce pearls
• https://www.youtube.com/watch?v=T18E58vOTus
• Oysters secrete shiny layer of calcium carbonate to coat irritating particles or parasites