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Phylum Cnidaria

Phylum Cnidaria. AKA: The “Stinging” Phylum. What is a Cnidarian?. Soft bodied Carnivorous with stinging tentacles around the mouth Simplest animals with symmetry and specialized cells Contain cnidocytes. Literally means “ stinging cell ” Used for defense and prey capture

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Phylum Cnidaria

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  1. Phylum Cnidaria AKA: The “Stinging” Phylum

  2. What is a Cnidarian? • Soft bodied • Carnivorous • with stinging tentacles around the mouth • Simplest animals with symmetry and specialized cells • Contain cnidocytes

  3. Literally means “stinging cell” Used for defense and prey capture Found all over the body but concentrated on the tentacles Cnidocyte Drawing Cnidocytes

  4. Medusa Polyp Cnidarian Body Plan

  5. Respiration Circulation Excretion All are accomplished by diffusion Essential Functions

  6. Feeding Paralyze prey Pull prey into gastrovascular cavity More Functions

  7. More Feeding…

  8. Response Nerve net surrounding body Have sense of… …touch …sight …gravity Movement Accomplished 2 ways Hydrostatic skeleton Jet propulsion Can Cnidarians Move?

  9. Once again, Reproduction • Some asexual • Via budding • similar to sponges • Some sexual • Involves external fertilization • Includes a larval stage

  10. Cnidarian Life Cycle Sperm+Egg Motile Medusa Males & Females Zygote Swimming Larva Sessile Polyp

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