Two new species of Heligmoptera Nadtochiy, 1977 (Nematoda : Trichostrongylina : Heligmosomoidea) from myospalacine rodents in China (Gansu), with a redefinition of the genus

Two species, Heligmoptera giraudouxi n. sp. and H. querei n. sp., are descr ibed. These are co-parasites of the small intestine of Myospalax fontanieri i in China (Gansu). H. giraudouxi is closely related to the only existing s pecies of the genus, H. myospalaxi (Nadtochiy, 1970), a parasite of Myospal ax psilurus in the Primor'e Region of Russia. It is distinguished by the pa ttern of the left lateral lobe. H. querei differs from the two other specie s by possessing a long dorsal ray and from H. giraudouxi by the length of t he left ala. From a phylogenetic point of view, these three species may for m a small clade, adapted to Myospalax spp., derived from related forms in I nsectivora, this capture resulting in the appearance of monodelphy.