Eimeria ahtanumensis n. sp. from the Northwestern Fence Lizard Sceloporus occidentalis in Central Washington

SYNOPSIS Eimeria ahtanumensis n. sp. is described from the northwestern fence lizard Sceloporus occidentalis. The sporulated oocysts are generally cylindrical with rounded ends, averaging 34.2 by 19.7 μ. No oocyst residuum or micropyle is present. The ellipsoidal sporocysts average 10.5 by 8.8 μ; each has a distinct sporocyst residuum composed of spherical granules located against the sides of the sporocysts. The elongate sporozoites, lying head to tail in the sporocyst, average 16.5 by 2.5 μ when excysted. Endogenous development occurs in the epithelial lining of the gall bladder and bile duct. E. ahtanumensis is compared to other similar lizard coccidia.