Molecular phylogeny of the harvestmen genus Sabacon (Arachnida: Opiliones: Dyspnoi) reveals multiple Eocene-Oligocene intercontinental dispersal events in the Holarctic

► The first and multilocus phylogeny of the Holarctic distributed Opiliones genus Sabacon. ► We find deep divergence, exceeding other genera in the Dyspnoi, warranting re-investigation of the genus level of Sabacon. ► We find three of four regional faunas non-monophyletic, and three clades including intercontinental disjuncts. ► Diversification and intercontinental exchange within the four major lineages corresponds with the Eocene-Oligocene boundary. ► Dispersal and speciation is likely mediated by the onset of global cooling.