1 / 11

Phylum Mollusca

Phylum Mollusca. Class Bivalvia. Class Bivalvia. Defining characteristics Two-valved shell Body flattened laterally This class contains clams, oysters, mussels, scallops, and shipworms. Bivalves and You. Many species are edible

kris
Télécharger la présentation

Phylum Mollusca

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. Phylum Mollusca Class Bivalvia Class Bivalvia

  2. Class Bivalvia • Defining characteristics • Two-valved shell • Body flattened laterally • This class contains clams, oysters, mussels, scallops, and shipworms Class Bivalvia

  3. Bivalves and You • Many species are edible • Also, an important food item for our commercially important fish • Important to humans in their ability to strain harmful bacteria out of polluted waters Class Bivalvia

  4. Bivalve Locomotion? • Most bivalves move by expansions and contractions of the foot • Mussels usually are sessile and attach to substrate with threads Class Bivalvia

  5. Bivalve shells Class Bivalvia

  6. The Mantle Class Bivalvia

  7. Bivalve Feeding • Bivalves are filter feeders • Ctenidia are used for feeding & respiration and are enlarged and folded to increase surface area Class Bivalvia

  8. Ctenidia Structure Class Bivalvia

  9. Ingestion & Digestion • In the stomach food is wound on the crystalline style Class Bivalvia

  10. Bivalve Reproduction • Dioecious • The male sheds sperm into the water column • Sperm can enter the female or fertilization can occur in the water column • Larvae develop from a trochophore larvae to a veliger Class Bivalvia

  11. Local Representatives • Northern Quahog (Mercenaria mercenaria) • Common Sand Clam (Tagelus plebeius) • Eastern Oyster (Crassostrea virginica) Class Bivalvia

More Related