A riverine fringe habitat in which Tetramorium nama sp. nov. was collected, showing living vegetation dominated by Euclea pseudebenus as well as numerous cut Prosopis glandulosa (freshly cut and piles of dry branches) B alluvial terrace gravel and C alluvial fan habitats (in which T. pogonion and T. rufescens were collected) between the river and the rocky mountains to the southwest: the alluvial fan lies between the gravel terrace and the mountains.