phylum cnidaria jellyfish, hydra, sea anemones, & coral

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  • Slide 1
  • Phylum Cnidaria Jellyfish, hydra, sea anemones, & coral
  • Slide 2
  • Appearance Polyp: cylindrical, pine shaped animals that are usually attached to a rock or Ex. Hydras, sea anemones, corals Medusa: bell-shaped body; umbrella Ex. Jellyfish *Have 2 tissue layers: ectoderm & endoderm
  • Slide 3
  • Appearance (cont.)
  • Slide 4
  • Appearance of a jellyfish
  • Slide 5
  • Symmetry Radial symmetry
  • Slide 6
  • Skeletal/Muscle System most have primitive muscle cells; coral have external skeleton of calcium carbonate
  • Slide 7
  • Capturing Prey LETS EAT!!! cnidarians are carnivores (eat meat) that use tentacles arranged in a ring around their mouth to capture prey when a trigger is stimulated on a stinging cell called the cnidocyte, a harpoon or nematocyst shoots out & injects poison into the prey
  • Slide 8
  • Capturing Prey: Cnidocyte and Nematocyst at work: Cnidocyte (stinging cell) Nematocyst (harpoon )
  • Slide 9
  • Digestion Sac w/ a digestive cavity (gastrovascular cavity) w/ a single opening that acts as a mouth/anus Jellyfish Hydra
  • Slide 10
  • Digestion (cont.) food is pushed into the gastrovascular cavity where digestion begins (extracellular digestion) then food is passed to food vacuoles of gastrodermis undigested remains leave through the mouth/anus
  • Slide 11
  • Nervous System Nerve Net- Cnidarians do not have a brain but they have simple sensory receptors that detect & respond to stimuli
  • Slide 12
  • Circulation NONE!!
  • Slide 13
  • Respiration Diffusion- oxygen from water moves into gastrodermal cells (high to low)
  • Slide 14
  • Reproduction Asexual budding- formation of outgrowths that pinch off from parent to live independently Sexual- forms a zygote and free swimming planula that settles on ocean floor; usually have separate sexes (male & female species) but some hermaphrodites do exist *MOST ALTERNATE B/W POLYP & MEDUSA LIFE FORM
  • Slide 15
  • Reproduction (cont.)
  • Slide 16
  • Slide 17
  • Excretion mouth/anus- release waste


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