Formica opaca Nylander, 1856b: 55, pl. 3, fig. 16 (w.) FRANCE, ALGERIA. Palearctic.

Primary type information: Primary type material: syntype workers (number not stated). Primary type localities: France and Algeria (no further data). Primary type depository: unknown (not found in Nylander’s collection in ZMHF (Radchenko, 2007). Type notes: It is possible that Nylander did not retain any material as his title of the species is followed by: “Duf. mscrpt.; Savign. Atl. Aegypt. X, 20, f. 7”.