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BIO CHAPTER 17, 21, 22

BIO CHAPTER 17, 21, 22 - 9:31:00 PM o Sponges Most live in...

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10/12/2007 00:31:00 o Sponges Most live in the marine Flagellated cells- choanocytes o Trap bacteria in mucus and thenengulf the food phagocytosis o Amoebocytes  “do all” cells of sponges o “natural sponges” o Cnidarians Body tissue Marine Gastrovascular cavity Sessile polyp (plant looking o Hydras, sea anemones, and coral animals Medusa o Jellyfish Cnidocytes- stinging cells o Flatworms Bilateral Planarians- not parasitic Blood flukes Tapeworms
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o Intestines o Roundworms Nematodes Most diverse and widespread Have complete digestive tract Has body cavity- psuedocoelom o Annelids Body segmentation Earthworm o Eat way through soil Polychaetes o Marine o Eat small invertebrates o Takes up oxygen and disposes metabolic wastes Leeches o Bloodsucking o Arthropods Jointed appendages Crustachens o Crabs and lobsters Arachnids
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o Spiders and scorpians Insects o Grasshoppers and moths Most successful animal phylum General Characteristics o Segmented o Exoskeleton Formed from chitin ( layers of protein and polysaccharides) o Molting (sheds shell) Diversity o Arachnids Four pair of walking legs  Specialized pair of feeding sppendages o Crustaceans Multiple pairs of specialized appendages Isopods Pillbugs o Millipedes and Centipedes Similar to annelids except for jointed legs Two pairs of short legs per segment and one pair of long legs o Insects
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Entomology-study of insects 3 part body head antennae and eyes and mouth
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