A left mandible of Fisheropone ambigua in dorsal view; worker (CASENT0906209); arrow indicates the basolateral pit B left mandible of Fisheropone ambigua in postdorsolateral view (CASENT0906209); arrow indicates the basolateral pit C anterior part of the head of Iroponera odax in dorsal view; worker (ANTWEB1008537); arrow indicates the dorsal pit D head of Rasopone panamensis in profile; worker (CASENT0644543); arrow indicates the dorsolateral sulcus E anterior portion of the clypeus and posterior portion of the mandible of Austroponera castanea in dorsolateral view; worker (CASENT0097796); arrow indicates the short and shallow dorsolateral sulcus F the expanded maxillolabial complex of Dolioponera fustigera in ventral view; worker (CASENT0411307); Roman numerals indicate the count of maxillary and labial palpomeres G apical portion of the outer face of the left maxilla of Fisheropone ambigua (CASENT0906209); Roman numerals indicate the count of maxillary palpomeres H outer face of the labium of Fisheropone ambigua (CASENT0906209); Roman numerals indicate the count of labial palpomeres I apical portion of the outer face of the right maxilla of Loboponera obeliscata; worker (ANTWEB1008545); Roman numerals indicate the count of maxillary palpomeres J outer face of the labium and left maxilla of Loboponera obeliscata (ANTWEB1008545); Roman numerals indicate the count of labial palpomeres K apical portion of the outer face of the left maxilla of Boloponera ikemkha; paratype, ergatoid queen (CASENT0254321); Roman numerals indicate the count of maxillary palpomeres L outer face of the labium and right maxilla of Boloponera ikemkha (CASENT0254321); Roman numerals indicate the count of labial palpomeres. Images by FA Esteves (A, B, E–H, K, L), RA Keller (C, I, J), and JT Longino (D); available at AntWeb.org. Scale bars: 0.02 mm (A–C, F, G, I, J–L); 0.2 mm (D, E); 0.01 mm (H).