From Knoesis wiki
Trypomastigote is an extracellular "non-replicative" form of a parasite. It is a leaf-like form with undulating membrane and flagellum that emerges through a flagellar pocket and runs the whole length of the cell. A large kinetoplast is found at the base of the flagellum; i.e., posterior end of the cell. Trypomastigote is found in the bloodstream of infected vertebrate host.