Cnidarians - Lake Stevens School District

Cnidarians - Lake Stevens School District

Cnidarians Jellyfish, Sea anemones and Coral Cnidarians are soft-bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. Nematocyst poison filled stinging structure that contains a tightly coiled dart.

Body Plans Cnidarians show radial symmetry 2 very different looking life stages Polyp sea anemone Medusa - Jellyfish

Life Processes Feeding carnivores, use nematocysts to capture.gastrovascular cavity digestion chamber with one opening. Respiration/circulation/excretion diffusion Response nerve net loosely organized network of nerve cells. Movement Polyps move by hydrostatic skeleton.

Medusa move by jet propulsion. Asexual Reproduction 1. Asexual Budding Swelling on polyp

which falls off and produces more polyps. Sexual Reproduction Sexual External fertilization separate sexes

egg/sperm produce a larvae which turns into a polyp and the buds release medusa. Types of Cnidarians 2. Hydra a colony of

separate organisms. 1. Jellyfish largest is 4-6 meters Ex. Portuguese man-ofwar tentacles can be

164 feet long Types of Cnidarians 3. Sea anemones and Coral

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