A new crown wasp in Cretaceous amber from Myanmar (Hymenoptera: Stephanidae)

A third species of Cretaceous crown wasps (Euhymenoptera: Stephanoidea) is described and figured from a male preserved in Upper Cretaceous amber from the Hukawng Valley of northern Myanmar. Phoriostephanus exilis Engel and Huang, gen. et sp. nov., is generally plesiomorphic relative to the subfamilies Electrostephaninae and Stephaninae, and shares many features with the relict Schlettereriinae. However, in many respects the fossil is aberrant and therefore classified in its own tribe, Phoriostephanini Engel and Huang, trib. nov., most notably for the more complete wing venation, a generally smooth integument, and the absence of the usually distinctive coronal tubercles.