Salgado-Miranda Celene, García-Albarrán Marco A, Soriano-Vargas Edgardo
Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Carretera Toluca-Atlacomulco km 15.5, 50200, Toluca, Mexico.
Institute for Biodiversity Research Development & Sustainability (iBIRDS), San Agustín Berros s/n, 50974, Villa Victoria, State of Mexico, Mexico.
Syst Parasitol. 2020 Jun;97(3):315-319. doi: 10.1007/s11230-020-09913-9. Epub 2020 Apr 6.
Isospora dipperia n. sp. is described from the feces of the American dipper Cinclus mexicanus Swainson collected in Yosemite National Park, California, USA. Sporulated oöcysts of the new species are subespherical, 20-24 × 17-21 (20.9 × 18.7) μm, with a length/width (L/W) ratio of 1.0-1.1 (1.1); one polar granule is present, but micropyle is absent. Sporocyts are lemon-shaped, 14-16 × 8-11 (15.5 × 9.8) μm, with a L/W ratio of 1.6; prominent Stieda and sub-Stieda bodies are both present, but para-Stieda body is absent. Sporocyst residuum of many scattered granules is present and the sporozoites have prominent anterior and posterior refractile bodies. The mean dimensions (15.9 × 13.8 µm) of unsporulated oöcysts of I. cincli Gottschalk, 1972 from the white-throated dipper C. cinclus (L.) in Europe, appear to be considerably smaller than those in I. dipperia n. sp. Comparisons of Isospora dipperia n. sp. with two species of Isospora Schneider, 1881 described in the Americas from birds of the family Sturnidae, related to Cinclidae, revealed that the mean dimensions of the sporulated oöcysts in the new species are considerably smaller than those in I. graculai Bhatia, Chauhan, Arora & Agrawal, 1973 from Gracula religiosa (24.6 × 22.4 µm) and I. rothschildi Upton, Wilson, Norton & Greiner, 2001 from Leucopsar rothschildi (22.3 × 21.6 µm). The new species is the first species of Isospora recorded in a bird of the family Cinclidae in the New World.
新种迪氏等孢球虫（Isospora dipperia n. sp.）是从采集于美国加利福尼亚州优胜美地国家公园的美洲河乌（Cinclus mexicanus Swainson）粪便中描述的。新种的孢子化卵囊近球形，大小为20 - 24×17 - 21（20.9×18.7）μm，长宽比为1.0 - 1.1（1.1）；有一个极粒，但无微孔。孢子囊呈柠檬形，大小为14 - 16×8 - 11（15.5×9.8）μm，长宽比为1.6；有明显的斯氏体和亚斯氏体，但无副斯氏体。孢子囊残体由许多散在的颗粒组成，子孢子有明显的前后折光体。1972年从欧洲白喉河乌（C. cinclus (L.)）分离出的辛氏等孢球虫（I. cincli Gottschalk）未孢子化卵囊的平均大小（15.9×13.8 µm）似乎明显小于迪氏等孢球虫新种。将迪氏等孢球虫新种与1881年施耐德（Schneider）描述的、来自美洲椋鸟科（与河乌科相关）鸟类的两种等孢球虫进行比较，结果显示新种孢子化卵囊的平均大小明显小于1973年从鹩哥（Gracula religiosa）分离出的格拉氏等孢球虫（I. graculai Bhatia, Chauhan, Arora & Agrawal）（24.6×22.4 µm）和2001年从罗氏椋鸟（Leucopsar rothschildi）分离出的罗氏等孢球虫（I. rothschildi Upton, Wilson, Norton & Greiner）（22.3×21.6 µm）。新种是新世界河乌科鸟类中首次记录的等孢球虫物种。
