The oribatid mite genus Separatoppia currently comprises four previously described species. We describe a new species, Separatoppia horvathae sp. nov., collected from soil in the Harenna forest within the Bale Mountains National Park (southeastern Ethiopia). This new species differs from its congeners by the extremely long sensilli. We present the first description of the ovipositor, gnathosoma and leg setation and solenidia of a Separatoppia species.