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Phylum Mollusca  Class: Gastropoda Class: Bivalvia
Characteristics of Mollusca  <ul><li>Protosome characteristics  </li></ul><ul><li>Coelom surrounds heart  </li></ul><ul><l...
Class Gastropoda  Snails, Limpets and Slugs
Gastropoda <ul><li>Planning on being rich and famous? </li></ul><ul><li>Wining and dining at the most expensive restaurant...
General Body Plan: Gastropod  <ul><li>1. Head foot </li></ul><ul><li>Head: sensory nerves, mouth  </li></ul><ul><ul><li>An...
That slimy foot…  <ul><li>Snail Slime:  </li></ul><ul><ul><li>Suction power: travel up and down trees  </li></ul></ul><ul>...
General Body Plan: Gastropod <ul><li>2.  Visceral Mass </li></ul><ul><ul><li>Organs of  digestion  </li></ul></ul><ul><ul>...
General Body Plan: Gastropod <ul><li>Mantle (shell)   </li></ul><ul><ul><li>Attached to visceral mass </li></ul></ul><ul><...
Respiration  <ul><li>One Gill in mantle cavity  </li></ul><ul><ul><li>Oxygen is taken in  </li></ul></ul><ul><ul><li>Diffu...
General Body Plan: Mollusca  <ul><li>Radula : Scraping mouth  </li></ul><ul><ul><li>Chitinous belt & curved teeth  </li></...
CFU  <ul><li>How do mollusks exchange gasses  </li></ul><ul><ul><li>Filter air through their gills  </li></ul></ul><ul><li...
Gastropoda  <ul><li>Marine, Freshwater, Terrestrial  </li></ul><ul><li>Signifying feature: Torsion  </li></ul>
Tosion <ul><li>Benefits  </li></ul><ul><ul><li>Head enters first: protection  </li></ul></ul><ul><ul><li>Operculum seals o...
Torsion
Reproduction  <ul><li>Monoecious: can be whatever sex they want!  </li></ul><ul><ul><li>Internal cross fertilization  </li...
CFU  <ul><li>What is Torsion? </li></ul><ul><ul><li>The 180 degree twisting of internal organs in snails  </li></ul></ul><...
Class Bivalvia  Clams, Oysters, Mussles, Scallops
Bivalvia!  <ul><li>Edible </li></ul><ul><li>Commercial value:  Form Pearls   </li></ul><ul><li>Valuable in removing bacter...
Structure  <ul><li>Two halves of a shell:  Valves   </li></ul><ul><ul><li>Adductor muscles hold valves shut  </li></ul></u...
Foot  <ul><li>Most mollusks have foot that can be used differently  </li></ul><ul><ul><li>Attach mollusk to surface  </li>...
Respiratory System  <ul><li>Respiration: Cilia in gills move water into mantel cavity  </li></ul><ul><ul><li>Water tubes e...
Digestive System  <ul><li>Food comes in through gills  </li></ul><ul><ul><li>Sorted  </li></ul></ul><ul><ul><li>Digested  ...
Human Interaction  <ul><li>Many, many mollusks are threatened or endangered </li></ul><ul><ul><li>Over harvesting </li></u...
CFU  <ul><li>What is the technical term for the two halves of the shell? </li></ul><ul><ul><li>Valves  </li></ul></ul><ul>...
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Mollusks bivalves:gastro

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Transcript of "Mollusks bivalves:gastro"

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