Sericomyrmex worker morphology and terminology. a Head, full-face view b petiole and postpetiole, lateral view; c metasoma, lateral view. Posterior cephalic corner shapes: d acute e rectangular f rounded. Frontal lobe shapes: g trapeziform h rectangular i triangular. Posterior cephalic border shapes: j posterior cephalic border gradually impressed k posterior cephalic border abruptly impressed. Mesosoma morphology: l mesosoma, lateral view m mesosoma, dorsal view. PCC Posterior cephalic corner PCE posterior cephalic emargination Tu tumulus V vertexal impression FrC frontal carina FrL frontal lobe post posterior frontal lobe margin lat lateral frontal lobe margin med medial frontal lobe margin vs postpetiolar ventral sternite LC longitudinal lateral gastral carina DC anteromedial dorsal gastral carina IFC incomplete frontal carina CFC complete frontal carina Fe frontal lobe fenestra APT anterior pronotal tumulus LPT lateral pronotal tubercle LMT lateral mesonotal tubercle PMT posterior mesonotal tubercle.