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Fascinating World of Cnidarians: Characteristics and Behaviors

Explore the diverse phylum Cnidaria, containing over 11,000 species thriving in aquatic environments. Discover their unique body symmetry, feeding methods using tentacle cnidocytes, circulation through diffusion, and response mechanisms through nerve nets. Learn about their distinct forms, movement patterns, reproduction processes, and respiration. Examples include sea anemones and jellyfish, showcasing the intriguing world of Cnidarians.

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Fascinating World of Cnidarians: Characteristics and Behaviors

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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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