1 / 18

Phylum Cnidaria

Phylum Cnidaria. Cnidarians Include Hydras, jellyfish, sea anemones & corals Radially symmetrical Acoelomate Two basic forms: Polyp : Cylindrical form which attach bases to substratum Medusa : Flattened, mouth down version of the polyp. Moves freely. Forms of Cnidarians. Body Plan.

hammer
Download Presentation

Phylum Cnidaria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phylum Cnidaria • Cnidarians Include Hydras, jellyfish, sea anemones & corals • Radially symmetrical • Acoelomate • Two basic forms: • Polyp: Cylindrical form which attach bases to substratum • Medusa: Flattened, mouth down version of the polyp. Moves freely

  2. Forms of Cnidarians

  3. Body Plan • Basic Body Plan: • Has an outer epidermis • Has an inner gastrodermis which forms a gastrovascular cavity • Has a middle "jelly filled" layer calledmesoglea

  4. 0 Cnidarians that are stuck to the ground are known as • Medusa • Polyp • Jellyfish • coral

  5. 0 The jelly filling in jellyfish is called • Medusa • Polyp • Mesoglea • Tentacle • None of the above

  6. 0 What does aceolomate mean? • No body cavity • Body cavity • Lack of arms • Asexual reproduction • None of the above

  7. Cnidocytes • Cnidarians are predators with special cells calledCnidocytes • Cnidocytes contain special stining capsules callednematocysts. • When triggered, these cells shoot out a discharge thread which can entangle and/or poison it's intended prey

  8. Reproduction • Reproduction can occur sexually by fertilization of egg and sperm forming larvae. • Reproduction can also occur asexually through budding • 3 Major classes • Class Hydrozoa: Hydras • Class Scyphozoa: Jellyfish • Class Anthozoa: Anemones and corals

  9. Class Hydrozoa: The Hydras • Polyp phase is dominant • Generally microscopic • Generally freshwater

  10. Class Scyphozoa: The Jellies • Generally refered tro as jellies • Medusa stage is dominant • Come in a variety of forms • Aggressive predators, and can be dangerous to humans Jelly Portugese Man-o-war

  11. Life Cycle

  12. Class Anthozoa: Anemones & Corals • Appear like plants but are animals. • Polyp form is dominant. • Corals build calcium shells to protect themselves • Have symbiotic relationship with algae. • Can build extensive masses which can form land masses. Anemone Coral Polyps

  13. Coral Reefs Clownfish living in An anemone

  14. 0 What class does a Man-o-war belong to? • Anthozoa • Scyphozoa • Hydrozoa • Arthropoda • None of the above

  15. 0 Which one of the following is not a free swimming phase of a jellyfish? • Strobila • Medusa • Ephyra • Planar larva

  16. 0 Which of the following is NOT a part of the cnidocyte • Coiled thread • Operculum • Nucleus • Nematocist • All of the above are part of the cnidocyte

More Related