Head width of each caste of M. brachypterum and M. intrudens. Different letters (a-c) indicate significant difference at p = 0.05 level using the Mann–Whitney U-test.

 
 
  Part of: Idogawa N, Dobata S, Okada Y, Yamane S (2025) A new species of Monomorium Mayr, 1855 (Hymenoptera, Formicidae) with a brachypterous queen from southern Japan, and phylogeny of Japanese Monomorium species with diverse reproductive strategies. ZooKeys 1250: 49-78. https://doi.org/10.3897/zookeys.1250.150776