Shrews (Eulipotyphla: Soricidae) are amongst the most diverse and widely distributed groups of small mammals worldwide. In Mexico, more than 40 species of the genera Sorex, Cryptotis, Megasorex, and Notiosorex have been documented. There is little knowledge about epizoic arthropods of shrews, with 40 species recorded, 28 corresponding to the subclass Acari, and 12 to Insecta. Sorex oreopolus Merriam, 1892, is an endemic species of Mexico, distributed from southwest Jalisco to east Puebla and west Veracruz. This study reports the first records of epizoic arthropods of S. oreopolus. Five specimens of S. oreopolus were collected during 2016 from four sites at La Malinche National Park, state of Tlaxcala. Epizoic arthropods were removed from the pelage of shrews and processed for identification. For each species found in S. oreopolus, ecological parameters of infestation were calculated; for parasitic species, also the degree of host specificity was estimated. A total of 1,194 arthropods were found, corresponding to six mite and one insect taxa. All are new records for this host species. The mites Orycteroxenus soricis (Oudemans 1915) and Pygmephorus horridus Mahunka, 1973 are recorded for the first time in Mexico. The prevalence and abundance of O. soricis was high, while Corrodopsylla lira Traub, 1950 is less prevalent/abundant (Table 1). Epizoic arthropods comprise commensals (Myobiidae), temporary ectoparasites (Trombiculidae) and (Ctenophthalmidae), and phoretic (Glycyphagidae and Pygmephoridae). Seven taxa of epizoic arthropods recorded in this study represent the first record of association with S. oreopolus. The mites O. soricis and P. horridus had already been documented on shrews of the genus Sorex; however, they are recorded for the first time in Mexico, increasing the richness of symbionts of Mexican shrews from 40 to 42 species. Further investigations on the richness of arthropods associated with Mexican shrews are needed, as only seven of 40 species of shrews have been documented, representing 20 % of hosts. Las musarañas (Eulipotyphla, Soricidae) constituyen uno de los grupos de mamíferos pequeños terrestres más diverso y con mayor distribución en el mundo. En México se encuentran en casi todo el territorio y se han documentado más de 40 especies de los géneros, Sorex, Cryptotis, Megasorex y Notiosorex. Es notable la falta de estudios sobre los artrópodos epizoicos de musarañas en el país, se han registrado 40 especies de los cuales 28 corresponden a la Subclase Acari y 12 a la Clase Insecta, asociados a siete especies de musarañas. La musaraña mexicana Sorex oreopolus Merriam, 1892 es una especie endémica de México, que se distribuye desde el extremo suroeste de Jalisco hasta el este de Puebla y oeste de Veracruz. Hasta la fecha no se han documentado sus artrópodos epizoicos, por lo que el objetivo de este trabajo es presentar los primeros registros. Durante el 2016 se recolectaron cinco ejemplares de S. oreopolus en cuatro sitios del Parque Nacional La Malinche en el estado de Tlaxcala. Los artrópodo...
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