Monomorium brachypterum Idogawa & Yamane, 2025: 60, figs. 1, 8A, C, E, 9A, C, 10A, C, E, 11C, 12H (w.q.m.) JAPAN. Palearctic.

Primary type information: Primary type material: holotype queen. Primary type locality: Japan: Central Ryukyu Islands, Amami-ôshima, Yuwan, 29.iii.2023 (N. Idogawa). Primary type depository: SKYC. Primary type specimen: KMNHSKYC25-01. Secondary type information: Secondary type material: 30 paratype workers, 6 paratype dealate queens, 7 paratype males. Secondary type locality: same as for holotype. Secondary type depositories: KUEC, SKYC. Secondary type specimens: KMNHSKYC25-08–37, KMNHSKYC25-02–07, KMNHSKYC25-37–43.