A thin, crescent- shaped organism with a single flagellum originating from a basal body and which folds back laterally across the cell would most likely be a member of the genus

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The description provided matches the morphology of Trypanosoma, a genus of flagellated protists that causes diseases like African sleeping sickness and Chagas disease. The single flagellum originates from a basal body at the anterior end of the cell and runs laterally across the cell body before folding back along an undulating membrane. The cell is crescent-shaped and may appear elongated or slightly curved based on its orientation. Gambiense is a subspecies of Trypanosoma brucei, while Glossina is the genus of tsetse flies that serve as the vector for Trypanosoma brucei in Africa. Entamoeba is a genus of amoeboid protists that lack flagella.

A Thin, Crescent- Shaped Organism with a Single Flagellum Originating