Eimeria spp. (Apicomplexa: Eimeriidae) from black- and white-tailed prairie dogs (Cynomys ludovicianus and Cynomys leucurus) in central and southeast Wyoming.

Feces collected from live-trapped black- (Cynomys ludovicianus) and white-tailed prairie dogs (Cynomys leucurus) from central and southeastern Wyoming were examined to determine the presence and prevalence of eimerian species. Six species (Eimeria adaensis [black-tailed prairie dog prevalence = 33%, white-tailed prairie dog prevalence = 51%], Eimeria beecheyi [8%, 28%], Eimeria callosper-mophili [64%, 71%], Eimeria lateralis [3%, 7%], Eimeria morainensis [19%, 8%], and Eimeria spermophili [2%, 1%]) were identified from both host species. Eimeria pseudospermophili was found infecting only black-tailed (prevalence = 1%) and Eimeria bilamellata only in white-tailed prairie dogs (2%). Reinfections in individual hosts were observed with E. callospermophili and E. adaensis. Comparison of these results with the published literature suggests that the host genera Cynomys and Spermophilus share a common guild of eimerians and that members of this guild have a long evolutionary association with these hosts, or host switching, or both, is common between these groups.