First and oldest Leptochirini rove beetles illuminate diverse cephalic structures in the Cretaceous (Coleoptera: Staphylinidae: Osoriinae)

Osoriinae is a highly diverse, globally distributed subfamily of rove beetles (Staphylinidae), but only a single Mesozoic species, Mesallotrochus longiantennatus Cai & Huang, in mid‐Cretaceous Burmese amber is known (age c . 99 Ma). Leptochirini, which is primarily found in decaying wood in the tropics, is one of the four tribes of osoriine rove beetles. The diversity of cephalic tooth shapes in adults has attracted special research...