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Cnidarian Dissection

Cnidarian Dissection. Moon Jellyfish. 1 minute video of moon jellyfish “in motion” Moon Jellyfish – YouTube. Oral arms vs. marginal tentacles.

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Cnidarian Dissection

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  1. Cnidarian Dissection

  2. Moon Jellyfish • 1 minute video of moon jellyfish “in motion” • Moon Jellyfish – YouTube

  3. Oral arms vs. marginal tentacles • A jellyfish has many tentacles. Some hang around the bell of the jellyfish. These hold the stinging cells. Other tentacles hang around the mouth. These are called oral arms. They may or may not have stinging cells. The oral arms pass the food into the jellyfish’s mouth. The food then goes into the animal’s stomach.

  4. Rhopalium • Rhopalia (singular rhopalium) are the most obvious sensory structures of scyphozoan jellyfish. They include specialized structures for sensing light (eyespots) and movement or direction with respect to gravity (statoliths).

  5. Moon Jelly

  6. Moon Jelly

  7. Structures to identify • Bell • epidermis • Oral arms • Tentacles • Mouth • Gastrovascular cavity • Rhopalium • Mesoglea • gonads

  8. Dissection video • http://www.youtube.com/watch?v=IdhBRz2Yq1Q

  9. Tentacle observation • Use a dissecting microscope

  10. Sea anemone

  11. Metridium information • http://www.boydski.com/diving/photos/metridium.htm

  12. Metridium video • http://www.youtube.com/watch?v=AlNGccPENGw • 1. Metridium fields • http://www.montereyscubaboard.com/metridiumfields.php

  13. Sea anemone • Feeding: • http://www.youtube.com/watch?v=nI8A61uqybw

  14. Sea anemone: Metridium

  15. Sea anemone dissection • External: basal (pedal)disk, tentacles, mouth • Internal: siphonoglyph, pharynx, septa (incomplete and complete), coelenteron, acontia, rector muscle, gonads

  16. Lab procedure • You will have step by step details for dissection • Questions/sketches will be completed in your journal and collected for a grade • Dissection quiz • Anatomical directions • Species information • Anatomy as seen in dissection

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