Tetramorium immigrans

More thermophilic than all species except Tetramorium hungaricum, Tetramorium breviscapus, and Tetramorium fusciclava; TAS of 201 sites 19.9 ± 2.5 °C [13.0, 26.7]. In France and partially Central Europe synanthropic: roadsides, ruderal areas, parks, gardens, pavements, railway constructions, stone pits, balconies, inside of buildings. In Pannonian zone, Mediterranean, and Caucasus most common species in anthropogenic areas, but also primary habitats like semi-arid and arid grasslands, rocky and sandy grasslands, beaches, river banks, rock walls. Bulgarian records from forests. Nests often between cracks of concrete, asphalt, rocks, as well as under stones; small soil mounds exist.

Distribution
Mediterranean, Western Europe, Central Europe, Balkans, Eastern Europe, Anatolia, Caucasus, introduced to North (STEINER & al. 2008) and South America (Santschi, 1927).

Distribution based on Regional Taxon Lists
Nearctic Region: United States. Neotropical Region: Chile.

Nomenclature

 *  immigrans. Tetramorium caespitum var. immigrans Santschi, 1927a: 54 (w.) CHILE.
 * Junior synonym of caespitum: Bolton, 1979: 171; Radchenko, 2016: 244.
 * Status as species: Wagner, et al. 2017: 120 (redescription).