Feces from 26 prairie racerunners, Cnemidophorus sexlineatus viridis Lowe, 1966, from Arkansas, were examined for coccidian parasites. One of these was found to be infected with oocysts of an undescribed eimerian, which is described herein as new. Sporulated oocysts of Eimeria sexlineatus n. sp. were cylindrical, 30.4 x 17.1 (28-32 x 16-19) microns, with a shape index (length/width) of 1.8 (1.6-2.0). A micropyle and oocyst residuum were absent but 1 (to several) polar granule(s) was present. Sporocysts were ellipsoidal, 10.7 x 8.5 (9.6-11.2 x 8.0-8.8) microns, with a shape index of 1.3 (1.2-1.4). A sporocyst residuum was present but Stieda, substieda, and parastieda bodies were absent. Sporozoites were elongate, 13.2 x 2.7 microns (12.0-14.4 x 2.4-3.2) in situ, containing a single, spherical posterior refractile body. Oocysts and endogenous developmental stages were found within the gall bladder epithelium of the infected lizard. This represents the first time a coccidian has been reported from a North American whiptail lizard.
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