Tetramorium sericeiventre is a very widespread species, occurring from South Africa north to Mali. A single worker had been collected in The Gambia in 1926, recorded as subsp. arenarium.
This species is not as common as some ants in The Gambia, but can be found in Kololi and on Jinack Island, where it can be quite conspicuous. It was collected from savannah, where it nested in the ground.
I was lucky enough to retrieve a queen from one of the nests, which is shown in one of the photographs.