Tetramorium tosii

Bolton, B., 1979, The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Malagasy region and in the New World., Bulletin of the British Museum (Natural History) Entomology 38, pp. 129-181 : 152

The tosii -group

Antennae with 12 segments, sting appendage dentiform. Mandibles sculptured. Anterior clypeal margin entire, without trace of a median notch or impression. Body with erect or suberect fine hairs present but dorsal (outer) surfaces of hind tibiae without such hairs. Petiole node in profile elongate and low (Figs 31, 33). Frontal carinae running back well beyond the level of the eyes. Large species, HW> 0.90. Antennal scrobes absent.

The two species in this small group represent the only endemic members of Tetramorium in the entire Malagasy region in which the antennae are 12 - merous and which are not obviously derived from any based on the Ethiopian region.