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Unformatted text preview: Sheet1 Page 1 Cnidaria Body Symmetry - The basic body symmetry of a cnidarian, especially a jellyfish, is radial, meaning that no matter h Excretion - Excretion is accomplished through diffusion. Respiration - Respiration is accomplished through diffusion. Reproduction - Asexual reproduction occurs through budding. Sexual reproduction occurs in the medusa stage. Movement - Most adult cnidarians are free floating. In the larval stage, members are free swimming. Sensation - Medusae have a more highly developed nerve net than do polyps, a feature that is associated with the more activ Body Cavity - Cnidarians are diploblastic, meaning that they have two distinct tissue layers, an ectoderm and endoderm, sepa Subdivisions - Cnidarians present particular problems for systematists. Their comparatively simple morphology makes it difficu The phylum Ctenophora, which includes the "comb jellies," "sea gooseberries," and "Venus's girdles," is not currently conside Sheet1 Page 2 cting nerve impulses both quickly and slowly give these animals considerable behavioral responsiveness and flexibility. Ganglicting nerve impulses both quickly and slowly give these animals considerable behavioral responsiveness and flexibility....
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- Fall '09