title: [Contributions to the life-cycle of Frenkelia. III. The sexual development of F. clethrionomyobuteonis in the buzzard (author's transl)].
abstract: 8 buzzards (Buteo buteo) were infected orally with cysts of Frenkelia clethrionomyobuteonis of the bank vole (Clethrionomys glareolus). Their intestines were searched for developmental stages of Frenkelia 21 and 24 h and 2, 3, 4, and 5 days post infection. After 21 and 24 h male and female gamonts could be detected within epithelial cells of the villi of the first half of the small intestine. The microgamonts contained 10-14 microgametes. The macrogamonts which measured on an average 11,1 X 9,8 mum in Giemsa stained smears developed into very thin-walled oocysts measuring in fresh preparations on an average 15,8 X 11,7 mum on day 3 after infection. The oocysts were located between the lamina propria and the epithelial lining of the distal third of the villi. They began to sporulate on day 5 and the first sporocysts were excreted 7 and 8 days post infection. Schizonts and schizont-like stages could not be observed in the developmental cycle in Buteo buteo.
mesh_terms: D000818:Animals; D016782:Apicomplexa / Q000145:classification / Q000254:growth & development*; D001717:Birds / Q000469:parasitology*; D005260:Female; D007413:Intestinal Mucosa / Q000469:parasitology; D007549:Isospora / Q000145:classification; D008297:Male; D013170:Spores
vernacular_title: Beiträge zum Lebenszyklus der Frenkelien. III. Die sexuelle Entwicklung von F. clethrionomyobuteonis im Mäusebussard