Tetramorium tortuosum

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 : 143

The tortuosum -group

Antennae with 11 segments, the sting appendage spatulate. Petiole nodiform; one or both pedicel segments with rugose or rugulose sculpture in all Malagasy and New World species. Mandibles sculptured. Large species usually with HW> 0.80, rarely less. Legs usually with dense or fairly dense pilosity which is suberect to subdecumbent on the dorsal (outer) surfaces of the middle and hind tibiae.

Within the genus Tetramorium this is the largest species-group with 11 - merous antennae. The group is represented by about 25 species in the Old World tropics and subtropics, and 7 of these species occur only in Madagascar.