The ultrastructure of the epimastigote stages of Trypanosoma rotatorium in the leech Batracobdella picta

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Abstract
Large numbers of epimastigotes were observed adjacent to the gastric epithelium of leeches (B. picta) fed 18 days earlier on a frog infected with T. rotatorium. EM study revealed that the modified flagellar sheaths of some of the epimastigotes formed hemidesmosomes with the gastric epithelium. Cytoplasmic components of the parasites included free ribosomes, sparse agranular reticulum, a well developed mitochondrial tube with plate-like cristae in the pre- and post-nuclear regions, 2 types of lipid inclusions, and 2 types of vesicular inclusions. The basal region of the typical flagellar apparatus was surrounded by an electron-dense, cylindrical sleeve situated immediately beneath the plasmalemma of the flagellar pocket. A polysaccharide component was demonstrated cytochemically on the outer surface of the plasma membrane of the epimastigotes.

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