Planarian[1]

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Planarian[1]

  1. 1. Planarian (Flat Worm)
  2. 2. About the worm <ul><li>Locomotion is by cilia </li></ul><ul><li>Range in size from 3-12mm </li></ul><ul><li>Has 2 small eye-spots </li></ul><ul><li>Eye-spots are used to move away from light </li></ul><ul><li>Have 3 layers of tissue </li></ul><ul><li>Free living </li></ul><ul><li>Carnivorous </li></ul>
  3. 3. What it Eats <ul><li>Feeds on other living organisms </li></ul><ul><li>Dead organisms </li></ul><ul><li>Like diatoms </li></ul><ul><li>Decaying organic matter </li></ul>
  4. 4. Reproduction <ul><li>Asexual reproduction </li></ul><ul><li>Budding or fission </li></ul>
  5. 5. Reproduction (cont’d) <ul><li>Can reproduce either asexually or sexually. </li></ul><ul><ul><li>In asexual reproduction the planarian detaches its tail end and each half regrows the lost parts. </li></ul></ul><ul><ul><li>In sexual reproduction each Planaria gives and receives sperm. </li></ul></ul><ul><li>Planaria have both testes and ovaries. </li></ul><ul><li>Eggs develop inside the body and are shed in capsules. </li></ul><ul><ul><li>Weeks later the eggs hatch and grow into adults. </li></ul></ul><ul><li>Planarians can also reproduce by regeneration. </li></ul><ul><ul><li>If it is cut into two halves, both halves may become two new Planaria (regeneration). </li></ul></ul>
  6. 6. Where can you find them? <ul><li>Beneath rocks, logs, dead leaves in springs, wetlands, streams, lakes </li></ul><ul><li>Found in cold water </li></ul><ul><li>Common to many parts of the world </li></ul><ul><li>Also commonly found residing on plants </li></ul>
  7. 7. Interesting Facts <ul><li>Planaria (family Planariidae ) are common freshwater, non-parasitic flatworms of the phylum Platyhelminthes, class Turbellaria. </li></ul><ul><li>The term &quot;planaria&quot; is most often used as a common name </li></ul><ul><ul><li>It is also the name of a genus within the family Planariidae </li></ul></ul><ul><li>Scientific classification </li></ul><ul><li>Kingdom: Animalia </li></ul><ul><li>Subkingdom: Eumetazoa </li></ul><ul><li>Superphylum: Platyzoa </li></ul><ul><li>Phylum: Platyhelminthes </li></ul><ul><li>Class: Turbellaria </li></ul><ul><li>Order: Seriata </li></ul><ul><li>Suborder: Tricladida </li></ul><ul><li>Family: Planariidae </li></ul>
  8. 8. More Cool Facts <ul><li>At the head there is a brain under the eyespots </li></ul><ul><ul><li>From the brain there are two nerve cords which connect at the tail </li></ul></ul><ul><li>There are many transverse nerves connected to the nerve cords which make it look like a ladder </li></ul><ul><li>The excretory system is made of many tubes with many flame cells and excretory pores on them </li></ul>

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