b - to a hard surface and develops into polyp, poly release...

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AP Biology Campbell Textbook Notes Cnidarians - Soft-bodies, carnivorous animals, have stinging tentacles around their mouths, simplest animals that have symmetry and specialized tissues. - Cnidocytes (stinging cells for defense, captures prey, contains nematocyst) - Nematocyst( poison filled stinging dart, paralyzes prey) - Two life stages: polyp(cylindrical body with armlike tentacles, upwards mouth, sessile). Medusa (motile, bell-shaped, downwards mouth). - Three main tissues in both stages: epidermis, mesolgea, gastroderm (lines gastrovascular cavity- digestive chamber with one opening) - Response (nerve net- loosely organized network of nerve cells, allow cnidarians to detect stimuli, have Statocysts- sensory cells detect gravity, have Oceli which detect light. - Hydrostatic skeleton (layer of circular muscles and longitudinal muscles; movement - Reproduction: external fertilization outside females body, zygote grows into larva, larva attaches
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Unformatted text preview: to a hard surface and develops into polyp, poly release medusa-Jellyfish: Scyphozoa, no colonies, sexual reproduction, medusas, can grow huge-Hydras and relatives: hydrozoa, colonies, Portuguese man of war contains specialized polyps, hydras: solitary polyps only, get nutrition from stinging small prey and symbiotic photosynthetic protists. -Sea anemones: anthozoa, solitary polyps . Corals: colonial, single polyp first grows when motile larva settles, new polyps grows thru budding, sexual reproduction, require light for photosynthetic symbionts-Chemicals, divers, sediments cause stress and kill corals by poisoning, damaging, or smothering them. Coral bleaching occurs with high temps in the water, and produces white skeletons. .. because of global warming....
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This note was uploaded on 01/02/2012 for the course BIO 101 taught by Professor Dr.chan during the Fall '11 term at Marine Biological Laboratory.

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