humanfluke2011 - PhylumPlatyheminthes ClassTrematoda...

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1 Phylum Platyheminthes Class Trematoda Subclass Digenea Superfamily Echinostomatoidea Genera: Fasciola, Fasciolopsis, Echinostoma Superfamily Schistosomatoidea Genera: Schistosoma Superfamily Opisthorchioidea Genera: Opisthorchis, Clonorchis, Heterophyes, Metagonimus Superfamily Allocreadioidea Genera: Paragonimus Schistosoma spp.(Bilharzia) Schistosoma japanicum – veins of small intestine. Terminal spine in eggs is sometimes barely visible China,SE Asia 15 million people Schistosoma haematobium – urinary bladder veins. Eggs have a terminal spine Africa, Middle East Schistosoma mansoni – portal veins that drain large intestine. Eggs have a lateral spine Africa, South America, Caribbean 10% of world population is infected
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2 Other Human Schistosomes S. intercalatum Have a terminal spine but are lodged in intestinal venules Central Africa and is a parasite mainly of cattle S. mekongi –restricted to portions of Viet Nam; recently determined to be different from S. japonicum Schistosoma spp. Adults live in veins of their definitive hosts Exceptional flukes–separate sexes compensate by permanent in copula Males have gynecophoral canal where females reside Have strong oral sucker Intestinal ceca fuse at midpoint of the worm then continue as a single gut to posterior Schistosome eggs lack opercula Single intermediate host–freshwater snails No redial stage! Cercariae penetrate intact skin
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3 S. mansoni suckers on adult Schistosoma adults in copula
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Schistosoma spp.relative sizes S.h. S.m
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This note was uploaded on 11/21/2011 for the course ZOO 4232 taught by Professor Kima during the Fall '10 term at University of Florida.

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humanfluke2011 - PhylumPlatyheminthes ClassTrematoda...

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