Biology Notes 4-16-08

Biology Notes 4-16-08 - Biology Notes April 16, 2008...

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Biology Notes April 16, 2008 Ecdysozoans: -all molt!!!! Horsehair worms: -long, thing and brown -larvae are internal parasites of insects and crayfish. -Adult lives in water Nematodes: -roundworm -un-segmented, thick cuticle -abundant but not very diverse -3 ascaris, 1 trichinella, 2 filarial, 3 enterobius, 5 hookworms -many are parasites on plants and animals -beneficial nematodes kill turf pests, crop pests and enhance composting Arthropods: -have limb-like appendages -are the dominant animals on earth, over 1 million species Key features: -exoskeleton – rigid, lightweight, waterproof -ecdysis (molting) -jointed appendages – rapid, precise control of movement -metamorphosis – transform larvae or juvenile to adult -separate feeding niches, less competition for habitats -varied feeding and ecological bredth -aquatic and terrestrial, tropics to poles Exoskeleton components: -chitin – a polysaccharide similar to cellulose, combined with protein; tough and flexible -calcium salts – added for strength; hard, brittle (crab and lobster)
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This note was uploaded on 05/02/2008 for the course BIOL 102 taught by Professor Hill/smith during the Spring '08 term at Idaho State University.

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Biology Notes 4-16-08 - Biology Notes April 16, 2008...

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