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[Leishmania spp.]

Promastigotes are not found in human tissue; this stage occurs in the mid-gut of the sand fly (genera Phlebotomus and Lutzomyia) intermediate hosts.  Promastigotes are elongate, slender and measure about 10-12 µm in length.  They have a large central nucleus and a kinetoplast located near the anterior end.  A flagellum arises at the anterior end, that may be longer than the rest of the promastigote.

A

A:  Leishmania sp. promastigotes from culture.