1 / 21

Exploring the Anatomy of Clam Venus Mercenaria

Discover the fascinating details of the Venus mercenaria clam, a bivalve mollusk with a hinged shell and a complete digestive tract. Learn about its internal and external anatomy, including adductor muscles and shell growth rings. Understand how bivalves use siphons for water circulation and filtering plankton, and explore their unique adaptations for survival in the aquatic environment.

cherylg
Download Presentation

Exploring the Anatomy of Clam Venus Mercenaria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

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

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

  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

More Related