Mollusks bivalves:gastro

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  • 1. Phylum Mollusca Class: Gastropoda Class: Bivalvia
  • 2. Characteristics of Mollusca
    • Protosome characteristics
    • Coelom surrounds heart
    • Open circulatory system (except cephalopods)
  • 3. Class Gastropoda Snails, Limpets and Slugs
  • 4. Gastropoda
    • Planning on being rich and famous?
    • Wining and dining at the most expensive restaurants?
    • Romantic trips to Paris?
    • Ever wonder what Ceaser munched on after long hard days ruling the roman empire?
    • Than you should be familiar with ESCARGOT!!!!
  • 5. General Body Plan: Gastropod
    • 1. Head foot
    • Head: sensory nerves, mouth
      • Anterior : near the head/mouth
    • Foot: attachment and locomotion
      • Posterior : near the anus
      • Flattened w Cilia: locomotion
  • 6. That slimy foot…
    • Snail Slime:
      • Suction power: travel up and down trees
      • Escape: Emit a nasty tasting slime when threatened
      • Movement: Allows them to easily squeeze through tight spaces
      • Water Retention
    • How Ms. Cota looks so young:
      • Skin regenerating
      • used in skin beauty products
  • 7. General Body Plan: Gastropod
    • 2. Visceral Mass
      • Organs of digestion
      • Circulation
      • Reproduction
      • Excretion
      • Dorsal to the head foot
  • 8. General Body Plan: Gastropod
    • Mantle (shell)
      • Attached to visceral mass
        • Encloses most of the body
      • Protection
    • Mantle Cavity:
      • Gas exchange
      • Elimination of digestive wastes
      • Release of reproductive products
  • 9. Respiration
    • One Gill in mantle cavity
      • Oxygen is taken in
      • Diffused through the cells
    • Open Circulatory System
      • Pushes blood in to expand
      • Pulls it out to contract
  • 10. General Body Plan: Mollusca
    • Radula : Scraping mouth
      • Chitinous belt & curved teeth
        • Covers fleshy tongue
        • Muscles move it back and forth
        • Conveyor belt
    • Digestion
      • Scrape algae
      • Enzymes break down food in stomach
  • 11. CFU
    • How do mollusks exchange gasses
      • Filter air through their gills
    • Where are these gills located?
      • The mantel
    • What is the structure called that scrapes up food?
      • A Radula
    • All mollusks have:
      • A visceral Mass
      • A head foot
      • A mantel
  • 12. Gastropoda
    • Marine, Freshwater, Terrestrial
    • Signifying feature: Torsion
  • 13. Tosion
    • Benefits
      • Head enters first: protection
      • Operculum seals opening to prevent drying out
      • Allows clean water to enter mantle cavity
      • Makes snail more sensitive to stimuli coming from the front
  • 14. Torsion
  • 15. Reproduction
    • Monoecious: can be whatever sex they want!
      • Internal cross fertilization
      • One snail acts as female one acts as male
      • Deposit eggs in gelationous strings
  • 16. CFU
    • What is Torsion?
      • The 180 degree twisting of internal organs in snails
    • How is Torsion adaptive?
      • Pulls head in first, seals opening, locates all sensory nerves in the front
  • 17. Class Bivalvia Clams, Oysters, Mussles, Scallops
  • 18. Bivalvia!
    • Edible
    • Commercial value: Form Pearls
    • Valuable in removing bacteria from polluted water!
      • Rely on water currents to get food
      • Filter in nutrients, filter out clean water
    • Valuable food source: humans, raccoons, otters, birds
  • 19. Structure
    • Two halves of a shell: Valves
      • Adductor muscles hold valves shut
    • Visceral Mass
    • Mantel Cavity
    • Gills
    • Cilia
    • Siphon:
      • filters water in and out of shell
  • 20. Foot
    • Most mollusks have foot that can be used differently
      • Attach mollusk to surface
      • Act as a lure to attract prey
      • Surround organs for safety
  • 21. Respiratory System
    • Respiration: Cilia in gills move water into mantel cavity
      • Water tubes exchange water to blood through diffusion
      • Water exits bivalve
  • 22. Digestive System
    • Food comes in through gills
      • Sorted
      • Digested
      • Waste forcibly pushed out of mantel cavity by valves shutting quickly
  • 23. Human Interaction
    • Many, many mollusks are threatened or endangered
      • Over harvesting
      • Pollution
      • Loss of habitat
      • Loss of water currents
  • 24. CFU
    • What is the technical term for the two halves of the shell?
      • Valves
    • What structure filters water in and out of the shell
      • Siphon
    • What is the function of the foot
      • Attach mollusk to substrate, act as lure
    • Why are bivalves important to humans?
      • Pearls, food source, pollution filter
    • How are humans affecting bivalves?
      • Over harvesting, pollution, loss of current
  • 25. Get ready for dissecfrtion!