During August 2003 and August 2004, 11 adult eastern red bats, Lasiurus borealis, were collected and their feces examined for coccidian parasites. Bats were obtained in August 2003 from Garland, Montgomery, and Yell counties, Arkansas (n = 6) and in August 2004 from Anson and Montgomery counties, North Carolina (n = 5). Seven (63.6%) of the bats were passing oocysts of 2 undescribed species of Eimeria. Oocysts of Eimeria dowleri n. sp. were subspherical to ellipsoidal, 24.7 × 22.0 (23–26 × 20–23) µm, with a bilayered wall, externally moderately pitted, internally smooth, and with a shape index of 1.1. Micropyle and oocyst residuum were absent, but a polar granule was present. Sporocysts were ovoidal, 13.4 × 9.2 (12–14 × 8–9) µm; shape index was 1.5; Stieda and sub-Stieda bodies were present. A sporocyst residuum consisting of homogeneous granules was scattered among the sporozoites; sporozoites were elongate, with a subspherical anterior refractile body and an elongate posterior refractile body; a nucleus was not discernable. Oocysts of Eimeria sealanderi n. sp. were subspherical to ellipsoidal, 16.7 × 14.4 (15–18 × 13–16) µm, with a bilayered wall, externally lightly pitted, internally smooth, and with a shape index of 1.2. A micropyle was absent, but the oocyst residuum and polar granule were present. Oocyst residuum consisted of a single, membrane-bound homogenous granule. Sporocysts were ovoidal, 8.9 × 5.7 (8–10 × 5–6) µm, with a shape index of 1.6; Stieda and sub-Stieda bodies were present. The sporocyst residuum consisted of 10, to several dozen, homogeneous granules of various sizes loosely clustered among the sporozoites, which were elongate and without obvious refractile bodies and nucleus. This is the first time any coccidian has been reported from this host and the first instance of a bat coccidian reported from North Carolina.
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