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Planarian[1]
 

Planarian[1]

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    Planarian[1] Planarian[1] Presentation Transcript

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