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Phylum Mollusca

Phylum Mollusca. Mollusca Vocabulary. Trochophore larvae 2. Mantle Visceral Mass 4. Ganglion Mantle Cavity 6. Radula Gastropoda 8. Hemolymph Hemocoel 10. Bivalvia Incurrent Siphon 12. Cephalopoda 13. Excurrent Siphon 14. Hydraulic skeleton. PREVIEW CARDS.

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Phylum Mollusca

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  1. Phylum Mollusca

  2. Mollusca Vocabulary • Trochophore larvae 2. Mantle • Visceral Mass 4. Ganglion • Mantle Cavity 6. Radula • Gastropoda 8. Hemolymph • Hemocoel 10. Bivalvia • Incurrent Siphon 12. Cephalopoda 13. Excurrent Siphon 14. Hydraulic skeleton

  3. PREVIEW CARDS I. Characteristics of phylum Mollusca (pg. 190, 192) II. Identify examples of the 3 main classes: Gastropoda, Bivalvia, Cephalopoda III. Explain the importance of torsion IV. 3 plausible advantages of torsion V. Shell and associated structures of bivalves VI. Sketch of Bivalve shell Fig. 12.9 VII. Bivalve diversity VIII. Cephalopod shell or lack thereof IX. Chromatophores in cephalopods

  4. Taxonomy Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Bivalvia CephalopodA

  5. Phylum Mollusca http://www.youtube.com/watch?v=jsxAr_yrJtM

  6. Mollusks • 50,000 -100,000 living species • 35,000 extinct species • Largest = 1000 pounds • 80% less than 5 cm

  7. Name comes from latin “molluscus”, meaning soft body • Most have a shell • Most marine

  8. Phylum Mollusca • Triploblastic • Symmetry: Bilateral • Coelomate • Protostomes

  9. Mollusca share 3 common features: • A muscular foot – usually for movement • A visceral mass – including internal organs • A mantle – envelopes visceral mass and secretes a shell

  10. Dorsal mantle covers the visceral mass.

  11. Secretes the shell

  12. Gills (Respiration)

  13. Complete digestive system

  14. Paired ventral nerve cords

  15. Radula

  16. Coelom - metanephridia

  17. Body Plan Pericardial cavity Metanephridium Mantle cavity Gonad Gills Radula Foot Stomach and digestive gland

  18. Molusk General Anatomy

  19. Class BivalviaClams, Oysters, Shipworms

  20. Class Bivalvia • Two shells • Most are filter feeders • No head or radula • Burrow • Sand, wood, rocks

  21. Bivalve Anatomy

  22. Giant Clam & Burrowing Clam Siphon

  23. Giant Clam

  24. Zebra Mussel • Environmental Pest • Ballast water of ships from Europe in 1986 • Attack by secreting adhesive byssal threads • Each other • Other mussels • Man made objects • Pipes, plumbing

  25. Zebra Mussel • Live in high densities • Feed on phytoplankton • Reproduce rapidly

  26. Zebra Mussel • Attach to native mussels • Killed all native mussels in Lake Erie

  27. Distribution of Zebra Mussel

  28. ZEBRA MUSSELL INFESTATION • http://www.myfoxtwincities.com/dpp/news/zebra-mussels-infest-minn-lakes-july-29-2010 • http://www.youtube.com/watch?v=7GeJeIVOYFI

  29. Oyster Ecology http://www.youtube.com/watch?v=HeqtLl4313M&feature=related

  30. Oysters in NYC http://www.youtube.com/watch?v=IFnbnJ8kGQQ

  31. Oysters – The Ultimate Filters

  32. Scallops

  33. Shipworms

  34. Class GastropodaSnails, Slugs, Conchs, Limpets

  35. Class Gastropoda • Largest Class of Mollusks • One shell (if present) • Torsion of body (visceral mass twists 180° during development)

  36. Torsion

  37. Gastropod • Open circulatory system • Fluid called Hemolymph

  38. Snail • Terrestrial • Mantle cavity functions as lung

  39. Snail Pneumostome Tentacle(Eye stalks) Shell Tentacle Anus Foot Mouth Genital pore

  40. Snails

  41. CONE SNAILhttp://www.youtube.com/results?search_query=tueb+snail+eats+fish&aq=f

  42. Nudibranch • No shell • Dorsal projections • Gills • Nematocyst discharge

  43. Spanish Dancer Nudibranch

  44. Abalone • Several holes in top of shell • Excrete waste • Food for man

  45. Slug • No shell • Garden pests

  46. Limpet • Herbivores • Cling to rocks or other surfaces

  47. Conch • Large shell • Marine • Many are predators

  48. Giant Conch • http://www.youtube.com/watch?v=TaaZD6gX4Rw

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