Terrestrial isopod populations were examined from 5 different sites on the Penn State–Altoona campus in Altoona, Pennsylvania, U.S.A. Length and sex of each isopod were recorded before it was examined for acanthocephalan parasites. Three isopod species were found: Armadillidium vulgare, Porcellio scaber, and Oniscus asellus. The acanthocephalan parasite Plagiorhynchus cylindraceus was found in P. scaber from a single site (site prevalence, 2.5%). This is the first report of natural infection of P. scaber by P. cylindraceus.
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