Abstract
As part of a zoogeographical research project, an analysis was made on the parasitic nematode fauna of the Japanese Microtinae and Murinae (Mammalia:Rodentia:Muridae). A total of 36 nematode species (16 families and 24 genera) were recognized from the host genera Clethrionomys, Eothenomys, Microtus and Apodemus on the Japanese archipelago. Among the parasitic nematodes, the zoogeographical analyses of the nematode genus Heligmosomoides (Heligmosomidae:Strongylida) were made with regard to the speciation and geographical distribution of the nematodes, the fossil records of small mammals and the geological record of the archipelago.
