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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

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Phylum Mollusca

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  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

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