Abstract
During the summers of 1997 and 1998, shrews (Sorex spp.) from northwestern Wyoming were examined for coccidia by necropsy. Because specimens collected in 1997 were frozen, coccidian oocysts did not sporulate, but the morphology of unsporulated oocysts collected from 3 of 19 (16%) masked shrews (Sorex cinereus) and 7 of 29 montane shrews (Sorex monticolus) suggests that Eimeria longirostris might be present. In 1998, sporulated oocysts of E. longirostris were recovered from 7 of 32 (22%) masked shrews and 5 of 14 (36%) montane shrews. In addition, an unidentified eimerian was recovered from 1 of 32 (3%) masked shrews and Isospora brevicauda from 2 of 14 (14%) montane shrews. The identification of E. longirostris in masked and montane shrews in northwestern Wyoming constitutes a new geographic record for this parasite. The recovery of I. brevicauda from montane shrews in northwestern Wyoming establishes new host and geographic records.
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