Abstract

From heteromyid rodents collected on the Mexican Plateau, new and named species of Geomylichus Fain (Listrophoridae) were found. Commensal prevalence, intensity, mean intensity and microdistribution are given for each association. Four new species are described, each from a different subspecies or species of Chaetodipus Merriam (Heteromyidae): G (Geomylichus) nelsoni n. sp. from Chaetodipus nelsoni nelsoni (Merriam); G. (G.) durangoensis n. sp. from Chaetodipus nelsoni canescens (Merriam); G. (G.) penicillatus n. sp. from Chaetodipus penicillatus eremicus (Mearns); G (G.) hispidus n. sp. from Chaetodipus hispidus zacatecae (Osgood). Additionally, new host records and new range extensions for five namedspecies of Geomylichus from the Mexican Plateau are given.

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