The life cycle of Leidyana ampulla sp.n. [Apicomplexa: Eugregarinorida: Leidyanidae] in the grasshopper Ronderosia bergi [Stal] [Orthoptera: Acrididae: Melanoplinae]

Summary. Leidyana ampulla, a new species of septate eugregarine, is described from the Argentine grasshopper Ronderosia bergi. Prevalence was high (76 %, n = 50) in San Pedro, Misiones province in northeastern Argentina, but the parasite was not detected in the center of the country (Bagual and Buena Esperanza in San Luis province, and Pehuajo in Buenos Aires province) where R. bergi is also normally an abundant species. Trophozoites, which had a simple, globular epimerite and were solitary, occurred attached to the intestinal epithelium. During transition from trophozoite to gamont the epimerite was not shedded but retracted into the protomerite. Gamonts were solitary, had a characteristic bottle-like appearance, and a total length that ranged from 280 to 584 µm (mean: 526.2 ± 13.3). Syzygy was biassociative and caudofrontral, the associates resembled each other in shape but not size. Spherical gametocysts measured 104 to 360 µm (mean: 247.7 ± 49.3). Gametocyst dehiscence was by a variable number of sporoducts (up to 12). Oocysts were dolioform, measuring 5.7 ± 0.06 by 2.8 ± 0.08 µm.

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