†Leptothorax placivus Wheeler, 1915i: 66 (w.) UKRAINE (Rovno Amber, Eocene).

Primary type information: Primary type material: neotype worker (by designation of Radchenko, 2024c: 731). Primary type locality: neotype Ukraine: Rivne Prov., Rovno amber, late Eocene, Priabonian age, 37.8-33.9 Ma. Primary type depository: SIZK (neotype). Primary type specimen: K-26865 (neotype). Type notes: Original type material: holotype worker.