Agnatha

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Agnatha

  1. 1. <ul><li>Name a vertebrate that has no jaws. </li></ul><ul><ul><li>There are only a few. </li></ul></ul><ul><li>Evidence supports, jaws evolved from gill arches in fish. </li></ul><ul><li>What would be the benefit to having jaws? </li></ul><ul><ul><li>Hold food, </li></ul></ul><ul><ul><li>Food can’t escape stomach </li></ul></ul><ul><li>Paired fins came at about the same time. </li></ul><ul><ul><li>Imagine trying to swim with no front fins </li></ul></ul>
  2. 2. Class Agnatha Video
  3. 3. <ul><li>The only jawless fish left – and there are 80 Species of them </li></ul><ul><ul><li>Lampreys and hagfish </li></ul></ul><ul><ul><li>Hagfish </li></ul></ul><ul><ul><ul><li>Eyes beneath the skin, </li></ul></ul></ul><ul><ul><ul><li>Have no vertebrae </li></ul></ul></ul>
  4. 4. <ul><ul><ul><li>Eat small invertebrates </li></ul></ul></ul><ul><ul><ul><li>Eat dead organisms </li></ul></ul></ul><ul><ul><ul><li>Bottom dwelling </li></ul></ul></ul><ul><ul><ul><ul><li>Sometimes the burrow into the dead organisms and live inside eating the organs. </li></ul></ul></ul></ul><ul><ul><ul><li>They can tie themselves in knots and release a slime to get away from predators. </li></ul></ul></ul>
  5. 5. <ul><li>Hagfish reproduction </li></ul><ul><ul><li>Not much is known </li></ul></ul><ul><ul><ul><li>Will lay 20 – 30 eggs </li></ul></ul></ul><ul><ul><ul><li>Can have couple of different batches of eggs inside female. </li></ul></ul></ul><ul><ul><ul><li>Some hermaphrodites have been found. </li></ul></ul></ul>
  6. 6. <ul><li>Hagfish defense. – Eating, tying in knots, SL part 4 min 1.01 </li></ul><ul><li>Sea cucumber defense–SL part 2 min 7.42 </li></ul>
  7. 7. Lampreys <ul><li>Eel like in body structure </li></ul><ul><ul><li>Have large eyes </li></ul></ul><ul><ul><li>Many live in freshwater </li></ul></ul><ul><ul><li>All reproduce in freshwater </li></ul></ul><ul><ul><li>Some are free living </li></ul></ul><ul><ul><li>Some attach to hosts as parasites. </li></ul></ul><ul><ul><li>Some never eat as adults. </li></ul></ul>
  8. 9. <ul><li>Reproduction </li></ul><ul><ul><li>Males make a crater </li></ul></ul><ul><ul><li>Females deposit the eggs, </li></ul></ul><ul><ul><li>Males fertilize the eggs </li></ul></ul><ul><ul><li>Video clip </li></ul></ul>

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