Formica gagatoides

Identification
Black, mandibles and appendages brown. Head and alitrunk dull, gaster shining with sparse adpressed pubescent hairs - length less than half interspace width. Propodeum angled in profile. Petiole scale broadly heart-scaped with more or less emarginate dorsal border. Erect hairs on gaster restricted to posterior border of tergites; mid femora normally without outstanding hairs. Length: 4.2-6.0 mm (Collingwood 1979).

Distribution
Exclusively arctic from Norway to Northeast Siberia.

Distribution based on Regional Taxon Lists
Palaearctic Region: Belgium, China, Finland, Japan, Montenegro, Russian Federation, Sweden.

Biology
This is one of the few Fennoscandian species that does not occur in the Alps or other mountains of Central Europe. In behaviour and general appearance it resembles Formica fusca, which it replaces in the north, but can be immediately distinguished by the shining gaster from F. fusca and from Formica transkaucasica by the duller head and alitrunk. It lives in small colonies of a few hundred workers with one or a few queens. Alatae fly in July and August.

Nomenclature

 *  gagatoides. Formica fusca var. gagatoides Ruzsky, 1904a: 289 (w.q.) RUSSIA. Ruzsky, 1915a: 423 (m.); Stärcke, 1935: 267 (footnote) (m.). Combination in F. (Serviformica): Emery, 1925b: 249. Subspecies of picea Nylander: Emery, 1925b: 249; Stitz, 1939: 368. Raised to species: Holgersen, 1942: 15; Holgersen, 1943a: 9. Junior synonym of picea Nylander: Bernard, 1967: 299. Revived from synonymy and status as species: Kutter, 1977c: 255; Collingwood, 1979: 121; Kupyanskaya, 1990: 188.