more flukes 2011 - Phylum Platyheminthes 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 Opisthorchis felineus and O. viverrini Adults live in the bile duct Acquired by eating fish This parasite is most common in southern, central and eastern Europe. Specifically, Turkey, southern parts of Russia, Vietnam and India. Also in Puerto Rico and other caribbean Islands. Worm causes diarrhrea, thickening and eventual erosion of the bile duct wall. Life cycle is similar to Chlonorchis Snail Genus Bithynia Fish host: cyprinid fishes Felines are important reservoir hosts.
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2 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 Paragonimus westermani (Oriental lung fluke) Adults usually live in pairs encapsulated in lung parenchyma can be ectopic in brain Have a medially located ventral sucker Are ~7.5 12 mm long Parasite of people, canids and felids Zoonotic parasite Use aquatic snail as 1st IH Use freshwater crabs and crayfish as 2nd IH
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3 Paragonimus westermani Geographic distribution: Canivores such cats and dogs are the more significant definitive hosts Asia, Russia, Philippines Other species in Africa, South America, Central America and Asia P. kellicotti in USA (dogs, cats and people); crayfish is the common intermediate host Paragonimus westermani Adult flukes Eggs Miracidium Sporocyst Redia Cercaria Metacercaria in crustaceans
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4 Paragonimus westermani Timing: Prepatent period 5 to 6 weeks Once eggs are shed into water the miracidium is formed in several
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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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more flukes 2011 - Phylum Platyheminthes ClassTrematoda...

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