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Some adaptations to endoparasitism in 20 species and 2 subspecies of euglenoid parasitic flagellates ihabiting gut of fresh water Copepoda have been studied. The trophozoites, dividing and flagellate forms have been examined by means of morphometric, morphological and cytochemical methods at light and electron microscope level. The developmental cycle, specificity and ecological conditions were analysed for establishing adaptative features. Three groups of species can be distinguished according to degree of their adaptations into parasitic way of life.
Two from three brown rats (Rattus norvegicus) catched in Milanówek near Warsaw, and one catched in the centre of Warsaw were infected with Trypanosoma lewisi. The morphometric features of trypanosomes were in accordance with the features of T. lewisi gived by other authors. This is first note about infection of free living rats with T. lewisi in Poland.
The studies were carried out in Kosewo Górne in the Mazurian District (North-East region of Poland), in September 1995, September 1996 and between May 1997 and June 1998 each month. The animals were trapped in live traps, and after study they were marked and released. The infection of trypanosomes was detected using microhaematocrit centrifugation technique and in blood smears. The intensity of infection had the range from 50 to 150000 individuals in 1ml of blood. The maximal prevalence of infection was in August and September and there were 45% and 38% of infected voles respectively. The infection was detected also in May 1998, in other months the prevalence had low level. There were no individuals of bank vole infected in succecding months. The females of bank vole are more often infected with trypanosomes than males.
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Meandry systematyki mikrosporydiow

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Meanders of systematics of Microsporidia. Taxonomical questions of Microsporidia, its systematic position and evolutionary relationship with other Eukaryota are discussed. Utilizations of modern methods of investigations of microsporidians cause new taxonomical troubles. At the present time it is difficult to create a clear hypothesis concerning the phylogeny and evolution of Microsporidia. Most likely they are representatives of a new kingdom of Eukaryota. Existing problems will not be dissolved until new detailed data concerning the new and common species are obtained.
212 freshwater fishes, belonging to 7 species, were examined for the presence of trypanosomes. The fishes were coming from breeding ponds in Gołysz (Silesia). The blood smears were fixed with methyl alcohol and stained with Giemsa method. Trypanosoma carassii MITROPHANOW, 1883 was found in blood of roach Rutilus rutilus (L.) (in 4 out of 19 examined specimens) and tench Tinca tinca (L.) (in 2 examined fishes). In trypanosomes from blood of both species of host there was observed a considerable variety of forms and size of body. Morphological description is completed with morphometrical values in the Tab. 2. Our own morphological description and morphometrical values have been compared with those of other authors. The authors of this paper agree with the opinion of LOM and DYKOVA (1992) that Trypanosoma tincae LAVERAN et MESNIL, 1904 is the synonym of Trypanosoma carassii.
Examination of blood from red deer, Cervus elaphus, in Poland, 1984-1992, revealed the presence of trypanosomes. Initially found by culture, subsequent recovery of blood-stream trypomastigotes on slides allowed morphometric analysis of the red deer species and comparison with known trypanosome species from other cervid hosts both in Poland and elsewhere. The species in red deer was found to be conspecific with Trypanosoma cervi Kingston et Morton, 1975 a well known blood and tissue parasite of all North American cervids.
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