Abstract
The genetic variability in Opisthorchis felineus trematodes from six rivers of Western Siberia was studied by using allozyme and multilocus DNA markers. The two methods of analysis gave identical results with regard to the genetic subdivision of populations and areal genetic variability patterns in O. felineus maritae. However, these indices differed from those of metacercariae. No genetic differences were detected among metacercariae from ide, dace and roach; thus, the parasite has no host subpopulations. The low level of O. felineus genetic variability is not consistent with the pronounced population structure of intermediate hosts, viz., cyprinid fish.
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