Earwigs from the late Oligocene crater lake of Enspel, Germany (Dermaptera)

The Konservat-Lagerstätte of Enspel, Germany preserves an exceptional late Oligocene biota, with abundant remains of insects. Here we provide the first formal descriptions of earwigs from the crater lake of Enspel, all adults and comprising two distinct species. Kraterlabis primordialis gen. et sp. nov. is a possible anisolabidid and is a wholly apterous, including complete absence of tegmina, and is distinguished by the form of the thoracic nota and the distinctive pygidium and cercal forceps. The holotype of Adiathetodes nassauensis gen. et sp. nov., unlike K. primordialis, is heavily pyritized but with lots of character information discernible. The species is likely a chelisochid as indicated by the form of the second tarsomere that projects strongly ventral to the third and with the third nearly as long as the first tarsomere. The genus is distinguished in the form of the pygidium and cercal forceps, as well as the thorax.