TL;DR: Kachinus magnificus, reported in six of the Scydmaeninae specimens from Spanish amber, is the oldest species formally described for the subfamily, and Pselaphinae is the most common rove beetle subfamily in amber inclusions worldwide.
TL;DR: The supertribe Hapsomelitae is newly diagnosed and doubt cast on one of its putative apomorphies, with the development of a “patella” considered a misinterpretation by the original authors.
TL;DR: Archeutheia is strikingly similar to the extant species of EutheIA and Veraphis, showing male dimorphic characters (modified protrochanters) and antennal cavities characteristic of Palaearctic Eutheiini, suggesting a long morphological stability in the supertribe Cephenniitae.