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Dissection of the Clam

Dissection of the Clam. Venus mercenaria. Modified from : http://www.biologyjunction.com. Bivalve Mollusks. Soft bodies invertebrates Have a muscular foot that can be extended for movement Two part, hinged shell Complete, one-way digestive tract with a mouth & anus Separate sexes.

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Dissection of the Clam

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  1. Dissection of the Clam Venus mercenaria Modified from :http://www.biologyjunction.com

  2. Bivalve Mollusks • Soft bodies invertebrates • Have a muscular foot that can be extended for movement • Two part, hinged shell • Complete, one-way digestive tract with a mouth & anus • Separate sexes Modified from :http://www.biologyjunction.com

  3. Bivalve Mollusks • No eyes or distinct head • Have siphons to circulate water through their bodies • Filter feed on plankton • Mussels are large and have a flat, more oblongshell shape, while freshwater clams are smaller (3/4 inch) and typically more round Modified from :http://www.biologyjunction.com

  4. Bivalve Mollusks • Protostomes – blastopore becomes the mouth • Have a fully lined body or mantle cavity • Body organs called visceral mass protected by mantle which secretes the shell • Open circulation • Most are sessile or sedentary • Includes clams, oysters, scallops, & mussels Modified from :http://www.biologyjunction.com

  5. External Anatomy Modified from :http://www.biologyjunction.com

  6. Bivalve Shell • Umbo is the raised, oldest part of the shell and is used to find surfaces Dorsal UMBO Posterior Anterior Ventral Modified from :http://www.biologyjunction.com

  7. Bivalve Shell • Shell show regular spacing of external growth rings on shells and their progressive crowding as the animals grow older Growth Rings Modified from :http://www.biologyjunction.com

  8. Bivalve Shell • Bivalves have an incurrent and excurrent siphon to bring in water containing food & O2 and for excess water & wastes to leave Siphons Modified from :http://www.biologyjunction.com

  9. Bivalve Shell • The hinge ligament holds the two halves of the shell together Modified from :http://www.biologyjunction.com

  10. Internal Anatomy Modified from :http://www.biologyjunction.com

  11. Adductor Muscles Strong adductor muscles help open & close the valves and must be cut to examine the interior of the clam Modified from :http://www.biologyjunction.com

  12. Modified from :http://www.biologyjunction.com

  13. Inside Shell Lining • The inside of the shell is pearly and smooth to protect the body • Oysters coat irritants with a substance called “mother of pearl” Modified from :http://www.biologyjunction.com

  14. Modified from :http://www.biologyjunction.com

  15. Teeth located on the dorsal edge of the shell lock to keep shells from sliding Modified from :http://www.biologyjunction.com

  16. The mantle makes a CaCO3 (limestone) shell Modified from :http://www.biologyjunction.com

  17. Mantle cavity Gills hang outside visceral mass (body) in the mantle cavity & remove O2as H2O flows over them Gills Modified from :http://www.biologyjunction.com

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  20. Water Flow • Incurrent siphons aid in bringing in water with food and oxygen • Cilia direct water into the gills, while labialpalps direct water into the mouth move food toward the mouth Cilia on the gills pulls in water Modified from :http://www.biologyjunction.com

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