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The distinction between the two closely related genera    Oligoneuriella    Ulmer, 1924 and    Oligoneuriopsis    Crass, 1947 has been much debated. First described from South Africa,    Oligoneuriopsis    seemed to be a clearly defined genus. However, as the known distribution of the genus widened and knowledge on it expanded, species delimitation based on morphology became less clear due to overlap in several apparently defining morphological characters, especially in the nymphs. This work attempts to reassess    Oligoneuriopsis    morphology in the context of all currently known species. The type species,    Oligoneuriopsis   lawrencei    Crass, 1947 is redescribed at the imaginal and nymphal stages and a neotype is designated. The putative nymph of    Oligoneuriopsis   dobbsi    (Eaton, 1912) is described based on material collected around Mt Elgon (Kenya). The adults of    Oligoneuriella   orontensis    Koch, 1980 are described for the first time and the species is transferred to the genus    Oligoneuriopsis    (   Oligoneuriopsis   orontensis    comb. nov. ). Egg structure is also described for the first time for the species    Oligoneuriopsis   skhounate    and    O.   orontensis   . Some biogeographical considerations are also given. It is likely that more species will still be discovered, especially in Africa.

A reassessment of the genus Oligoneuriopsis Crass, 1947 ( Ephemeroptera , Oligoneuriidae , Oligoneuriellini )