The wood thrush, Hylocichla mustelina, is a North American passerine bird closely related to other thrushes and is widely distributed across North America. Nothing is known of the coccidian parasites of this bird. Feces from a single H. mustelina found dead in McCurtain County, Oklahoma were collected and examined for coccidia; it was found to be passing a new species of Isospora. Oocysts of Isospora gmelini n. sp. are subspheroidal to ellipsoidal with a smooth bilayered wall, measure (length [L] × width [W]) 19.5 × 16.5 μm, and have a L/W ratio of 1.2; a micropyle and oocyst residuum were absent but polar granule(s) are present. Sporocysts are ellipsoidal to elongate and measure 13.4 × 8.9 μm, L/W 1.5; a buttonlike Stieda body is present, but sub-Stieda 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. Although several isosporans have been reported from other turdid birds, mainly from Brazil and Costa Rica, this is the initial coccidian reported from H. mustelina and only the second known from the Turdidae in the mainland of the United States.

中文翻译：

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来自俄克拉荷马州Hylocichla mustelina（Aves：Passeriformes：Turdidae）的Wood Thrush的新异孢子虫（Apicomplexa：Eimeriidae）。

鹅口疮Hylocichla mustelina是与其他鹅口疮有密切关系的北美雀形目鸟，在北美广泛分布。没有人知道这只鸟的球虫寄生虫。收集了在俄克拉荷马州麦克库兰县发现的死于H. mustelina的粪便，并进行了球菌检查。它被发现正在传播一种新的异孢菌。鹅掌Is的卵囊。sp。球形到椭圆形，具有光滑的双层壁，尺寸为（长[L]×宽[W]）19.5×16.5μm，L / W比为1.2；没有一个小孔和卵囊残留物，但存在极性颗粒。孢子囊呈椭圆形，伸长，长13.4×8.9μm，长/宽1.5；有一个纽扣状的斯蒂达（Stieda）身体，但不存在亚斯帖达（sub-Stieda）和对位斯帖达（para-Stieda）身体。孢子囊残体由紧密的球状体组成，在子孢子体之间散布着密集的，不规则的细小颗粒。尽管从其他混浊鸟类（主要是从巴西和哥斯达黎加）中已经报告了几种等孢子虫，但这是H. mustelina报道的最初的球虫，在美国本土仅是Turdidae已知的第二个。