Trypanosoma brucei ssp.
Trypanosoma brucei gambiense. 
  Trypomastigotes in mouse thin blood film (Giemsa's stain, oil immersion). They 
  have a small kinetoplast at the posterior end of the body, a central nucleus, 
  and a flagellum that emerges at the anterior end. One organism demonstrates 
  a characteristic feature of African trypanosomes- the presence of dividing forms 
  in the blood stream.