title: Endogenous development of Hemolivia mauritanica (Apicomplexa: Adeleina: Haemogregarinidae) in the marginated tortoise Testudo marginata (Reptilia: Testudinidae): evidence from experimental infection.
abstract: Six young tortoises Testudo marginata Schoepff, 1792 were experimentally infected with Hemolivia mauritanica (Sergent et Sergent, 1904). The prepatent period ranged from 6 to 8 weeks. Young, smaller, club-like forms (6-9 x 3-6 Am) of gametocytes appeared in the peripheral blood first, whereas mature, elongated, cylindrical forms (9-12 x 5-7 Am) were detected after 1-2 weeks and predominated during later patency. Three of the infected tortoises were euthanized and dissected to study the endogenous stages. Meronts occurred in the cells of the reticulo-endothelial system and in the erythrocytes; these were observed mostly in parenchymatous organs. Mature forms measured 14.2 x 9.3 microm and contained 7-12 merozoites. Cysts with two (exceptionally one) cystozoites were also found predominantly in parenchymatous organs and measured 14.8 x 7.9 microm. Pathological changes attributable to Hemolivia were mild and limited to liver and kidneys. The role of individual developmental stages of haemogregarines is discussed with respect to evolution of heteroxenous life cycle and long-term persistence of parasites in their intermediate hosts.
authors: Department of Biology and Wildlife Diseases, University of Veterinary and Pharmaceutical Sciences, Palackého 1-3, 612 42 Brno, Czech Republic. sirokyp@vfu.cz
authors: Pavel
authors: P
authors: Siroký
authors: Martin
authors: M
authors: Kamler
authors: Fredric L
authors: FL
authors: Frye
authors: Petr
authors: P
authors: Fictum
authors: David
authors: D
authors: Modrý
mesh_terms: D000818:Animals; D016782:Apicomplexa / Q000254:growth & development / Q000472:pathogenicity*; D004912:Erythrocytes / Q000469:parasitology; D007668:Kidney / Q000469:parasitology / Q000473:pathology; D008018:Life Cycle Stages; D008099:Liver / Q000469:parasitology / Q000473:pathology; D034101:Sporozoites / Q000254:growth & development; D014426:Turtles / Q000469:parasitology*