| discovery of new ohbayashinema spp. (nematoda: heligmosomoidea) in ochotona princeps and ochotona cansus (lagomorpha: ochotonidae) from western north america and central asia, with considerations of historical biogeography. | three new species of ohbayashinema (nematoda, heligmosomoidea) are described from localities in western north america and central asia. two of these species, ohbayashinema nearctica n. sp. and ohbayashinema aspeira n. sp., are parasitic in american pika, ochotona princeps. ohbayashinema nearctica is differentiated from the 5 known species of the genus parasitic in ochotonidae from the old world by very long spicules and an oblique axis of orientation for the ridges composing the synlophe. ohbaya ... | 2010 | 20557204 |