[Uncinaria (Megadeirides) olseni n. sp., Nematode with archaical morphological characters, parasite of a Tupaia from Borneo (author's transl)].

The species is closely related to U. bauchoti parasite of malagasian Tenrecoidea (sub-genus Megadeirides). The two species may be considered as a link with the primitive sub-family Globocephalinae. The genus Uncinaria itself is considered as an archaic group, which could be at the origin of Uncinariinae-Ancylostomatinae.