Abstract
Alexeieff (1911) described two trichomonads from the horse-leech Haemopis sanguisuga:Tetratrichomonas prowazeki and Trichomonas sanguisugae. T. prowazeki is characterised by its four anterior flagella of unequal length and its poorly developed axostyle. The feature which he considered to be of specific value in T. sanguisugae is the “chapelet de grains” in place of the basal fibre.

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