Baltic amber impact on historical biogeography and palaeoclimate research: oriental rove beetleDysanabatiumfound in the Eocene of Europe (Coleoptera, Staphylinidae, Paederinae)

Baltic amber is a rich source of fossilized organisms and a valuable tool for evolutionary, biogeographical and palaeoenvironmental research. Because it is found in several deposits around the Baltic Sea, the exact area of origin, age in the Eocene and palaeoenvironment of the amber forest form a subject for ongoing discussion. Furthermore, there is a puzzling connection between Eocene climate change and the co‐occurrence of thermophilic and temperate insect taxa in Baltic amber, sometimes even in the same inclusions. We revisit these issues through a new piece of evidence: the rare South‐East Asian rove beetle genusDysanabatium(11 extant species) found to be abundant in Baltic amber. We describe four new extinct species ofDysanabatiumbased on 13 specimens from 8 amber pieces collected in Denmark, Poland, Ukraine and Russia. These species areDysanabatium kechrimparensesp. nov.,D. aenaumsp. nov.,D. damgaardisp. nov. andD. johannesisp. nov. The occurrence of one species,D. kechrimparensesp. nov., in the amber from all countries, as well as its co‐occurrence withD. damgaardisp. nov. in one amber piece from Russia, suggest a possible common origin of Baltic amber from all these deposits.Dysanabatiumadds to a plethora of fossil species congeneric with extant species restricted to South‐East Asia, which points to the warm and equable climate of the north European Eocene amber forest.