A abdominal pretergite IV of Brachyponera obscurans in dorsal view; worker (CASENT0059638) B abdominal pretergite IV of Mesoponera subiridescens in dorsal view; worker (CASENT0906219) C stridulitrum of Mesoponera subiridescens in dorsal view (CASENT0906219) D medial area of the abdominal pretergite IV of Euponera sikorae; worker (CASENT0497109) E close-up of the medial area of the abdominal pretergite IV of Euponera sikorae; worker (CASENT0134370) F medial area of the abdominal pretergite IV of Mesoponera caffraria; worker (CASENT0408614) G medial area of the abdominal pretergite IV of Mayaponera pergandei; male (CASENT0317474) H abdominal pretergite IV of Mayaponera pergandei in dorsal view; worker (CASENT0845437) I close-up of the medial area of the abdominal pretergite IV of Mayaponera pergandei; worker (CASENT0845437). Images by FA Esteves; available at AntWeb.org. Scale bars: 0.06 mm (A, F, G, I); 0.09 mm (B); 0.04 mm (C); 0.2 mm (D, E); 0.08 mm (H).