Leptothorax sordidulus Müller, 1923a: 70 (w.) ITALY. Palearctic.

Primary type information: Primary type material: holotype worker. Primary type locality: Italy: Roditti, on the Karst of Trieste, iv.1911 (G. Müller). Primary type depository: unknown. Type notes: 1) Müller, 1923b: 96, adds to the holotype information: Venezia Giulia, 23.iv.1911. 2) Csősz et al., 2015: 55, say the holotype is most probably lost.