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Phylum Cnidaria

Explore the diverse world of cnidarians, including hydras, jellyfish, sea anemones, and corals. Learn about their radially symmetrical bodies, reproduction methods, and unique features like cnidocytes. Discover the different classes and their characteristics.

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Phylum Cnidaria

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  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 called mesoglea

  4. Cnidocytes • Cnidarians are predators which have tentacles possessing batteries of special cells called Cnidocytes • Cnidocytes contain special stining capsules called nematocysts. • When triggered, these cells shoot out a discharge thread which can entangle and/or poison it's intended prey

  5. 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

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

  7. 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

  8. 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

  9. Coral Reefs Clownfish living in An anemone

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