†Leptothorax gracilis Mayr, 1868c: 89, pl. 5, figs. 89-92 (w.m.) POLAND (Baltic Amber, Eocene).

Primary type information: Primary type material: neotype worker (by designation of Radchenko, 2024c: 721). Primary type locality: neotype Poland: Baltic amber, late Eocene, Priabonian age, 37.8–33.9 Ma. Primary type depository: LIB (neotype). Primary type specimen: 4944 (CCGG 6814) (neotype). Type notes: Original type material: 1 syntype worker, 2 syntype males.