Iridomyrmex difficilis Heterick & Shattuck, 2011: 73, figs. 31, 95 (w.) AUSTRALIA (Western Australia). Australasia.

Primary type information: Primary type material: holotype worker. Primary type locality: Australia: Western Australia, 2 km. NNW Crossman, 32°45’S, 116°34’E, 24.ix.1981 (I.D. Naumann & J.C. Cardale). Primary type depository: ANIC. Secondary type information: Secondary type material: 15 paratype workers. Secondary type localities: 3 paratype workers Western Australia, Mt Magnet area, 15.v.1967, ANIC ants vial 63.233 (C.T. Mercovich), 9 paratype workers Western Australia, Mt Magnet area, 15.v.1967 (C.T. Mercovich), 3 paratype workers Western Australia, 16 km. NNW Gibson, 17.xi.1969, ANIC ants vial 60.148 (R.W. Taylor). Secondary type depositories: ANIC, MCZC.