the occurrence of the avian schistosome allobilharzia visceralis kolákrová, rudolfová, hampl et skirnisson, 2006 (schistosomatidae) in the tundra swan, cygnus columbianus (anatidae), from north america.twelve tundra swans, cygnus columbianus (ord), from nevada and one from new mexico were collected and examined for schistosomes. mature worms, determined as allobilharzia visceralis, were found in 92% of the swans, in the inferior mesenteric vein of the large intestine and its branches. in 12 cases, there was endophlebitis of the inferior mesenteric vein. the morphology of the worms is consistent with the recently described genus allobilharzia. placement in this genus was confirmed also by phylo ...200717886738
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