Barn swallows (Hirundo rustica) are the most widespread swallow species in the world. However, little is known about the coccidian parasites of H. rustica. Feces from a single H. rustica nesting in McCurtain County, Oklahoma, were collected in May 2018 and examined for coccidia; the swallow was found to be passing a new species of Eimeria. Oocysts of Eimeria hochatownensis n. sp. are ellipsoidal with a smooth bi-layered wall, measure (L × W) 25.5 × 15.2 μm, and have a length/width (L/W) ratio of 1.7; a micropyle and oocyst residuum are absent, but polar granule(s) are present. Sporocysts are ellipsoidal and measure 12.8 × 6.5 μm, L/W 2.0; a nipple-like Stieda body is present, but sub-Stieda bodies and para-Stieda bodies are absent. The sporocyst residuum is composed of a compact spheroid with a dense, irregular mass of finer granules lying between and dispersed among the sporozoites. This is the first eimerian reported from H. rustica and the family Hirundinidae, and only the fourth Eimeria spp. known from passerine birds of the New World.

中文翻译：

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来自俄克拉荷马州东南部家燕的新艾美尔虫（Apicomplexa：Eimeriidae），Hirundo rustica（鸟纲：雀形目：Hirundinidae）：来自新世界雀形目的第四种艾美尔虫。


家燕 (Hirundo rustica) 是世界上分布最广的燕子种类。然而，人们对 H. rustica 的球虫寄生虫知之甚少。 2018 年 5 月，我们收集了在俄克拉荷马州麦柯廷县筑巢的一只 H. rustica 的粪便，并检查了球虫的情况；这只燕子被发现正在通过一种新的艾美耳球虫。艾美耳球虫 (Eimeria hochatownensis) 卵囊sp。椭圆体，具有光滑的双层壁，尺寸（长×宽）25.5×15.2μm，长/宽（L/W）比为1.7；不存在珠孔和卵囊残留物，但存在极性颗粒。孢子被呈椭圆形，尺寸为 12.8 × 6.5 μm，长/宽 2.0；存在乳头状斯泰达体，但不存在亚斯泰达体和副斯泰达体。孢子被残留物由致密的球体组成，具有致密、不规则的细颗粒团，位于子孢子之间并分散在子孢子之中。这是来自 H. rustica 和 Hirundinidae 科的第一个艾美尔虫，也是第四个艾美尔虫。源自新大陆的雀形目鸟类。