Host and geographically related genetic variation in species of (Nematoda: Strongyloidea) from western and eastern grey kangaroos, and (Marsupialia: Macropodidae).

Specimens of , , , , , , and , which occur in both of the closely related species of grey kangaroos, and , were found to differ genetically based on sequence data derived from the internal transcribed spacers (ITS-1, ITS-2) of ribosomal DNA. The extent of differences varied from a single base pair in , to 32 in . In the case of , and , separate genotypes were found in and .