Abstract
A new extinct genus and species of Pristocerinae, †Archeonesia eocena Tribull, Pankowski & Colombo, gen. et. sp. nov., are described from upper Eocene Baltic amber from the Yantarny amber mine in the Kaliningrad region, Russia. Descriptions, remarks, illustrations, and comparisons to all extinct and extant Pristocerinae are provided. †Archeonesia is described as a new genus because neither the male nor the female can be placed in any previously described genera, although the female is most similar to Acrenesia and the male is most similar to Cleistepyris. Rare for Bethylidae, and Hymenoptera in general, this fossil contains both a male and female specimen that we are describing as conspecifics. A brief review from the paleoentomological literature is provided to describe how insect fossils containing evidence of reproductive behavior have been used to associate conspecifics in extinct species.
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