Abstract
Sibiriulus mikhaljovae sp. nov. is described from the Altai Province, southwestern Siberia, Russia. This new species differs from its congeners mainly by the presence of a longitudinal crest inside the apical fovea of the gonopod mesomere. Brief descriptive remarks concerning several previously described Sibiriulus species allow for the definition of the genus to be supplemented and refined. All eight currently known species of Sibiriulus are keyed.
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