b112_Lecture_33_p02

b112_Lecture_33_p02 - 2/25/2008 MedicinalLeeches...

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2/25/2008 15 Medicinal Leeches Haementeria ghilianii Leech in Eye Leeches in the eye of an unfortunate soul who drank from the wrong pond in India. Phylum Nemotoda Roundworms ~ 90,000 species, maybe ~ 900,000 exist living Unsegmented, tapered at both ends, fluid filled pseudocoelom, longitudinal muscles Notable Nemotodes Caenorhabditis elegans Trichinella spiralis Numerous other parasites in man and other animals Plant root parasites Ascaris lumbricoides –Worms Expelled from Human Intestines 4 cm ruler
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2/25/2008 16 Hookworm Phylum Arthropoda 1,000,000+ species described, 2/3 of all organisms Dominant by sheer numbers Main Characteristics Hard exoskeleton (requires molting) Jointed appendages Arthropoda Characteristics Extensive cephalization and well developed sense organs Open circulatory system with hemolymph Gills or other specialized surfaces for gas exchange
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2/25/2008 17 Cheliceroformes–Class Arachnida Scorpions, ticks, spiders, mites Cephalothorax, 1 pair chelicerae, 1 pair pedipalps, 4 pairs of legs Book lungs (rarely tracheae) Spinnerets produce silk in many spiders Limulus polyphemus – Horseshoe Crab Desert Scorpion Theraphosa blondi – Goliath Birdeating Tarantula Lycosa carolinensis – Carolina Wolf Spider
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b112_Lecture_33_p02 - 2/25/2008 MedicinalLeeches...

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