Abstract
amintinus collected in Los Angeles Co., California (Doran and Jahn, 1952, Transactions of the American Microscopical Society 71: 93-101). The incidence of infection for Dipodomys in our survey was quite low, only 8 of 102 (8%) of the kangaroo rats examined were infected. Vance and Duszynski (1985, Journal of Parasitology, in press) suggest that the incidence of coccidial infections may be in part dependent on the environment in which the hosts are found. In the present study, all of the Dipodomys species infected with Coccidia were captured in a relatively hydric environment. Those kangaroo rat species that were uninfected were from more xeric environments, indicating agreement with Vance and Duszynski's suggestion. Of the 8 species of kangaroo rats examined, 2 were collected in sympatry; D. elephantinus and D. heermanni from San Benito Co. Since both species contained only unsporulated oocysts it was not possible to determine if their coccidian parasites were the same. However, there was only 1 oocyst morpho-type found in the 2 species. These oocysts were ellipsoid in shape and contained a single-layered wall (1.0 MAm). The mean oocyst dimensions were 26.7 x 18.2 gm. Based on these data and on photographs, the unsporulated oocysts resembled Eimeria mohavensis, TABLE I. Coccidians recovered from 8 species of kangaroo rats (Dipodomys) from California.
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