Probolomyrmex Mayr 1901

Probolomyrmex Mayr, 1901 Probolomyrmex Mayr, 1901: 2. Type-species : Probolomyrmex filiformis, by monotypy. Diagnosis. The worker caste of Probolomyrmex is easily distinguished from that of the other genera of the subfamily by a combination of the following features: frontal lobes fused to each other and forming a vertical plate; antennal socket located in shelf-like fronto-clypeal region that overhangs mandibles; mandible small, elongate-triangular, with acute apical tooth followed by a series of small denticles; outer surface of mandible with several thick and short setae; promesonotal suture and metanotal groove absent; gaster not downcurved; body covered with extremely fine pubescence, without standing hairs. In general, the queen caste is similar in colour and morphology to the worker caste. But the queen differs majorly from workers in having well developed eyes, ocelli and wings in addition to other differences in morphology and physiology (Taylor 1965; Agosti 1994; Eguchi et al. 2006; Keller 2011; Oliveira & Feitosa 2019).