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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

Phylum Mollusca

Class Bivalvia

Class Bivalvia

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

Class Bivalvia

bivalves and you
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

bivalve locomotion
Bivalve Locomotion?
  • Most bivalves move by expansions and contractions of the foot
  • Mussels usually are sessile and attach to substrate with threads

Class Bivalvia

bivalve shells
Bivalve shells

Class Bivalvia

the mantle
The Mantle

Class Bivalvia

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

Class Bivalvia

ctenidia structure
Ctenidia Structure

Class Bivalvia

ingestion digestion
Ingestion & Digestion
  • In the stomach food is wound on the crystalline style

Class Bivalvia

bivalve reproduction
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

local representatives
Local Representatives
  • Northern Quahog (Mercenaria mercenaria)
  • Common Sand Clam (Tagelus plebeius)
  • Eastern Oyster (Crassostrea virginica)

Class Bivalvia