Olson V A, Gissing G J, Barta J R, Middleton A L
Department of Zoology, University of Guelph, Ontario, Canada.
J Parasitol. 1998 Feb;84(1):153-6.
Isospora gryphoni n. sp. is described from oocysts found in the feces of the American goldfinch, Carduelis tristis, from Guelph, Ontario, Canada. The oocysts are spherical to subspherical, with a double-layered, smooth, colorless oocyst wall, 29.2 x 30.7 microm (25-33 x 28-34; n = 30) with 2-4 rice-grain-shaped polar bodies; no micropyle or residuum. Sporocysts are ovoid, 22.2 x 13.4 microm (15-25 x 12-14.5; n = 30) with a small Stieda body, indistinct substiedal body, and prominent sporocyst residuum. Sporozoites are vermiform, each with a large refractile body at the posterior end. Forty-nine of 52 (94%) wild-caught adult C. tristis and 1 juvenile bird (minimum 12 days old) were excreting oocysts of I. gryphoni. None of 36 nestlings (maximum 10 days old) was excreting oocysts. Fecal encrustations from 7 of 10 used nests were found to contain oocysts of I. gryphoni.
格氏等孢球虫（Isospora gryphoni）新种是根据在加拿大安大略省圭尔夫市的美洲金翅雀（Carduelis tristis）粪便中发现的卵囊描述的。卵囊呈球形至亚球形，具双层、光滑、无色的卵囊壁，大小为29.2×30.7微米（25 - 33×28 - 34；n = 30），有2 - 4个米粒状极体；无微孔或残体。孢子囊呈卵形，大小为22.2×13.4微米（15 - 25×12 - 14.5；n = 30），有一个小斯氏体、不明显的亚斯氏体和明显的孢子囊残体。子孢子呈蠕虫状，每个在后端有一个大的折光体。52只野生捕获的成年美洲金翅雀中有49只（94%）和1只幼鸟（至少12日龄）排出格氏等孢球虫的卵囊。36只雏鸟（最大10日龄）均未排出卵囊。在10个使用过的鸟巢中的7个鸟巢的粪便结痂物中发现含有格氏等孢球虫的卵囊。
