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Cnidarians

Cnidarians. By: Kaden C. Jacqueline M. Phylum: Cnidaria. Example:. phylum under Kingdom Animalia  over 11,000 species aquatic environments: they are predominantly marine. . Jellyfishes Sea Fans Sea anemones Hydras Coral. Body Symmetry and Body Plan.

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Cnidarians

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  1. Cnidarians By: Kaden C. Jacqueline M.

  2. Phylum: Cnidaria Example: • phylum under Kingdom Animalia  • over 11,000 species • aquatic environments: they are predominantly marine.  • Jellyfishes • Sea Fans • Sea anemones • Hydras • Coral

  3. Body Symmetry and Body Plan • Depending on the type they could have a bilateral, radial, or no symmetry.

  4. Cnidaria feeding • Some are filter feeders • Uses Tentacle Cnidocytes Nematocysts by injecting poison cells into prey • prey such as crustaceans and fish pass by and touch their tentacles. •  they poison them and draw them toward their mouths to be digested. • Predation, or carnivore is the prey on another animal.

  5. Circulation • Diffusion • From water to cells • Cells back to water

  6. Cnidaria Excretion •  individual cells carrying the waste back into the water. • Diffusion 

  7. Cnidaria Response •  nerve nets with specialized cells called Cnidocytes •  poison prey and cause a jellyfish sting.

  8. Movement • Some don’t move • Other use weak muscles to somersault • Polyp - like a sea anemone with a columnar body with the mouth uppermost surrounded by a ring of tentacles. - stationary • Medusa - free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge.

  9. Reproduction • Both asexually and sexually • Males release sperm into the water  • Females absorb it

  10. Respiration • Diffusion • Individual cells obtain oxygen directly from water

  11. Examples • Polyp like a sea Anemone  • Medusa like a jellyfish

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