DiseiusDiseius is a genus of mites in the family Ascidae.Species ''Diseius ulmi''DistributionDiseius are found generally living in colonies on tree bark.DescriptionIt has a completely divided dorsal shield without transverse lines extending across the surface. There is a podonotal shield with thirteen pairs of setae, an opisthonotal shield with twelve pairs of setae, a small anal shield with only circumanal setae, and a paranal setae inserted closer to the posterior margin of the anus than to the anterior margin.