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Phylum Mollusca

Phylum Mollusca. Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda. Molluscs. Have adapted to a wide variety of habitats Terrestrial, marine, benthic, and accomplished swimmers. The Molluscan Body Plan. The body plan is similar and distinct from all other phyla

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Phylum Mollusca

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  1. Phylum Mollusca Polyplacophora Gastropoda Bivalvia Scaphopoda Cephalopoda Phylum Mollusca

  2. Molluscs • Have adapted to a wide variety of habitats • Terrestrial, marine, benthic, and accomplished swimmers. Phylum Mollusca

  3. The Molluscan Body Plan • The body plan is similar and distinct from all other phyla • The Mollusca body plan includes: • A large muscular foot • A radula • Mantle and mantle cavity • Usually a small head • Soft unsegmented body • A hard non-living calcareous shell Phylum Mollusca

  4. The Foot Phylum Mollusca

  5. The Radula • Radula • Some molluscs have a rod of digestive enzymes (crystalline style) in the stomach Phylum Mollusca

  6. The Mantle • The mantle is the body wall that enclose the body cavity Phylum Mollusca

  7. The Mantle Cavity • Houses the viscera and comb-like molluscan gills • Ctenidia are respiratory in function and can collect food particles • Mantle cavity also is the site for reproductive, excretory, and digestive systems Phylum Mollusca

  8. Taxonomic Summary • Phylum Mollusca • Class Polyplacophora • Class Gastropoda • Subclass Prosobranchia • Subclass Opisthobranchia • Class Bivalvia • Class Scaphopoda • Class Cephalopoda Phylum Mollusca

  9. Class Polyplacophora • Defining characteristics • Shell forms as a series of 7 to 8 separate plates • Chitons Phylum Mollusca

  10. Chiton Lifestyles • Found close to shore mainly in the intertidal where they live on hard substrates Phylum Mollusca

  11. Chiton Anatomy Phylum Mollusca

  12. Ingestion and Digestion • Radula is used to scrape algae from the rocks • Mouth is anterior and anus is posterior; linear digestive tract Phylum Mollusca

  13. Reproduction • Reproduction • Sexes are separate with fertilization occurring in the water column • Trochophore larvae • Free swimming which settles and metamorphoses into an adult Phylum Mollusca

  14. Local Representative • Eastern Beaded Chiton (Chaetopleura apiculata) • Occurs subtidally on old shells Phylum Mollusca

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