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General Zoology Unit Two Objective Eighteen

General Zoology Unit Two Objective Eighteen. Definitions. Diploblastic – having two germ layers from which tissues and structures arise. Ectoderm – outer germ layer that gives rise to tissues and structures that cover the outside.

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General Zoology Unit Two Objective Eighteen

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  1. General Zoology Unit Two Objective Eighteen

  2. Definitions Diploblastic – having two germ layers from which tissues and structures arise Ectoderm – outer germ layer that gives rise to tissues and structures that cover the outside Endoderm – inner germ layer that gives rise to tissues and structures that cover the inside Mesoglea – jelly-like substance found between the inner and outer layers

  3. Gastrulation Ectoderm Mesoderm Endoderm Blastopore Blastula Gastrula Diploblastic

  4. General Zoology Unit Two Objective Nineteen

  5. Cnidaria Eukaryotic, eumetazoans Diploblastic Have true tissues, but no organs All are marine Radially symmetrical (no cephalization) Polymorphic – two forms (polyp & medusa) Cnidocytes – stinging cells Have a nerve net Polyps are sessile, while medusae can move Asexual and sexual reproduction

  6. General Zoology Unit Two Objective Twenty

  7. Cnidarian Taxonomy Kingdom - Animalia Phylum - Cnidaria Class – Hydrozoa Ex. – Physalia, Obelia, Hydra, Gonionemus Class – Scyphozoa (true jellyfish) Ex. – Aurelia, Cassiopeia Class – Cubozoa Ex. – Carybdea Class – Anthozoa Ex. – Metridium, Gorgonia, Tubipora

  8. General Zoology Unit Two Objective Twenty One

  9. Cnidarian Polymorphism

  10. Polyp Anatomy

  11. Gonionemus

  12. Aurelia

  13. Cnidocyte Anatomy

  14. General Zoology Unit Two Objective Twenty Two

  15. Class - Hydrozoa Most are marine and colonial in form Most forms exhibit alternation of generations between asexual polyps and sexual medusae, but some have only one or the other form Obelia Hydra Physalia

  16. Class - Scyphozoa Referred to a the true jellyfish All are solitary Polyp stage is much reduced or absent Main body is cup shaped Aurelia

  17. Class - Cubozoa All are relatively small in size All are solitary Polyp stage is much reduced Main body is cube shaped Carybdea

  18. Class - Anthozoa Polyp form predominant, no medusa stage Some are solitary, while others are colonial Many form zooxanthellae relationship with algae Most ecologically important group due to reef building Metridium Gorgonia Tubipora

  19. General Zoology Unit Two Objective Twenty Three

  20. Alternation of generations Planula Budding

  21. Alternation of generations Planula Budding

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