Marine 2 21-12

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Marine 2 21-12

  1. 1. Marine Worms Flatworms, Annelids, & Polychaeates
  2. 2. Evolution in progress!! <ul><li>Going from sponges </li></ul><ul><ul><li>Multi cellular </li></ul></ul><ul><ul><ul><li>No sensory organs </li></ul></ul></ul><ul><ul><ul><li>No locomotion </li></ul></ul></ul><ul><ul><ul><li>No cognitive functioning </li></ul></ul></ul><ul><ul><ul><li>No organs </li></ul></ul></ul><ul><ul><li>Sessile </li></ul></ul><ul><ul><li>Asymmetrical </li></ul></ul>
  3. 3. To Worms! <ul><li>organ level of organization! </li></ul><ul><ul><li>What organs did you find in the worksheet? </li></ul></ul><ul><li>Bilateral symmetry </li></ul><ul><li>Cephalization </li></ul><ul><ul><li>Beginnings of a brain </li></ul></ul><ul><li>Locomotion </li></ul><ul><li>Active predators </li></ul>
  4. 4. Phylum platyhelminthes Class turbellaria
  5. 5. Flatworms! <ul><li>Cephalization </li></ul><ul><ul><li>Can detect light, chemicals, and movement </li></ul></ul><ul><li>Locomotion </li></ul><ul><ul><li>Covered with a layer of cells called the epidermis </li></ul></ul><ul><ul><li>Ventral surface of epidermis produces mucus </li></ul></ul>
  6. 6. Flatworms <ul><li>Digestion: </li></ul><ul><ul><li>Heterotrophs </li></ul></ul><ul><ul><ul><li>Crustaceans, snails, annelid worms </li></ul></ul></ul><ul><ul><ul><li>Bodies of dead animals </li></ul></ul></ul><ul><ul><ul><li>Diatoms </li></ul></ul></ul><ul><ul><ul><ul><li>Why is it more beneficial to eat diatoms? </li></ul></ul></ul></ul>
  7. 7. Active predators <ul><li>Entangle prey in mucus </li></ul><ul><ul><li>Suffocates </li></ul></ul><ul><li>Stab prey with a pharynx </li></ul><ul><ul><li>Pumps out enzymes </li></ul></ul><ul><ul><li>Sucks out body fluids </li></ul></ul><ul><li>Gastrovascular cavity </li></ul><ul><ul><li>What do the branches in the cavity do for the organism? </li></ul></ul>
  8. 8. Flatworms <ul><li>Reproduction </li></ul><ul><ul><li>Asexually and sexually </li></ul></ul><ul><ul><ul><li>regeneration </li></ul></ul></ul><ul><li>Reciprocal copulation </li></ul><ul><ul><li>Hermaphrodites </li></ul></ul><ul><ul><li>Exchange both sperm and egg </li></ul></ul>
  9. 9. Tapeworms <ul><li>Parasitic </li></ul><ul><ul><li>Live in digestive tract </li></ul></ul><ul><ul><li>Can be huge </li></ul></ul><ul><li>No digestive tract or nervous tissue </li></ul><ul><li>Passed through intermediate hosts </li></ul><ul><ul><li>Can be deadly </li></ul></ul><ul><li>Attach to host using a scolex </li></ul>
  10. 10. Phylum Annelida <ul><li>Segmented worms </li></ul>
  11. 11. Annelids <ul><li>Worms whose bodies are divided internally and externally into segments </li></ul><ul><li>Heterotrophs </li></ul><ul><ul><li>Take in nutrients from the soil </li></ul></ul><ul><ul><li>help to filter nutrients </li></ul></ul>
  12. 12. Structure of annelids <ul><li>Bilateral </li></ul><ul><ul><li>Fluid filled: hydrostatic skeleton </li></ul></ul><ul><li>Longitudinal and circular muscles to help with locomotion </li></ul><ul><li>Setae: </li></ul><ul><ul><li>bristles on skin that help movement </li></ul></ul><ul><li>Cerebral ganglia </li></ul><ul><li>Gas exchange occurs across the skin </li></ul>
  13. 13. Digestion <ul><li>Food enters body through the pharynx </li></ul><ul><ul><li>Organic nutrients are digested in the intestine </li></ul></ul><ul><li>Nutrients are stored in the crop </li></ul><ul><li>Help to filter nutrients in the soil </li></ul>
  14. 14. Class polychaetes
  15. 15. Tube like worms <ul><li>Live in sand mud, corals, shells </li></ul><ul><li>Bury themselves in the sand and project only their jaws or tentacles out of their tubes </li></ul>
  16. 16. Structure <ul><li>Light sensors </li></ul><ul><ul><li>pull themselves back in their tubes </li></ul></ul><ul><li>Tentacles </li></ul><ul><ul><li>Use cilia to strain food and release wastes </li></ul></ul><ul><li>Tubes </li></ul><ul><ul><li>Protective </li></ul></ul><ul><ul><li>Made of calcium, carbon, </li></ul></ul><ul><ul><li>Structure </li></ul></ul>
  17. 17. Digestion <ul><li>Digestive tract running straight through </li></ul><ul><ul><li>Usually two openings </li></ul></ul><ul><ul><li>Or turn themselves inside out to release wastes </li></ul></ul>
  18. 18. Reproduction <ul><li>Asexual: </li></ul><ul><ul><li>regeneration, budding </li></ul></ul><ul><li>Sexual: </li></ul><ul><ul><li>Epitoke: pelagic reproduction </li></ul></ul><ul><ul><ul><li>Release millions of sperm and eggs all in one night </li></ul></ul></ul>

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