Figure 11. Couplet 1 in Evidence for the evolution of eusociality in stem ants and a systematic revision of †Gerontoformica (Hymenoptera: Formicidae)

Figure 11. Couplet 1: mesonotum with (1-1) or without (1'-1) transverse ridge; abdominal segment IV with (1-2) or without (1'-2) cinctus; prora large (1-3) or small (1'-3). (1-1) †G. ufv-05, ANTWEB103848 (J. Chaul, AntWeb), mesosoma in profile view. (1'-1, 1'-3) †G. indet., JWJ-Bu19 (V. Perrichot, AntWeb), mesosoma in profile view. (1-2) †G. sternorhabda sp. nov. paratype, UFV-LABECOL-009656, metasoma in ventrolateral view. (1'-2) †G. gracilis, CASENT0741232, metasoma in lateral view. (1-3) †G. pilosa holotype, JZC-Bu225 (P. Barden, AntWeb), anterior metasoma in profile view.