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
Feb 23, 2016
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• Like other mollusks, bivalves have
an open circulatory system.• They breathe and filter feed
through gills
Class Bivalvia• Incurrent and
excurrent siphons are used to pump water through the organism for:
1. Gas (O2) exchange
2. Filter feeding3. Jet propulsion
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
Oysters produce pearls
• https://www.youtube.com/watch?v=T18E58vOTus
• Oysters secrete shiny layer of calcium carbonate to coat irritating particles or parasites