Abstract
Tetratrichomonas didelphidis is a flagellate protozoan found in the intestine of opossums Didelphis marsupialis, Didelphis albiventris, and Lutreolina crassicaudata. The isolate used in this study was from L. crassicaudata and it was cultivated in monoxenic culture with Escherichia coli in Diamond (TYM) medium without maltose and with starch solution (trypticase-yeast extract-starch), pH 7.5 at 28 degrees C. Scanning electron microscopy showed the fine morphological features of the trophozoites: the emergence of the anterior flagella, the structure of the undulating membrane, the axostyle and posterior flagellum. In addition, we described spherical forms that are probably pseudocysts. Our data will contribute to a better understanding of surface structures in T. didelphidis.
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