Abstract
Two new species of trichostrongylid parasites of a mountain gorilla in Uganda are described. Paralibyostrongylus kalinae n. sp. is characterised by a short dorsal ray, a dorsal oesophageal tooth and two median longitudinal ridges in the vulvar region. The species is more closely related to leporid parasites than to P. hebrenicutus, another species known from the gorilla. A “transfuge” phenomenon, i.e. transfer to a new host without speciation is suggested. Hyostrongylus kigeziensis n. sp. has several specific morphological characteristics and in particular a synlophe with many strong ridges, rays 4 and 5 divergent at the apex, and the dorsal ray with two branches. Hyostrongylus appears to be an Ethiopian genus which has radiated in many archaic mammals.
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