Formica rufa

A common forest ant that makes large mound nests. Their conspicuous nests make this a well known and recognizable ant for anyone that has spent time in European lowland forests. Queens start new colonies by parasitizing nests of other ants.

Identification
Bicoloured red and brownish black with variable degree of depth and size of dorsal dark patch on head and promesonotum. Eyes usually with a few microscopic hairs. Long erect hairs more or less abundant on gula, clypeus, dorsum of head, alitrunk, scale and gaster but never on scape nor on posterior border of occiput. Occasional to few suberect hairs on extensor surfaces of hind tibiae and femora. Frontal triangle reflecting light but often in part with micropunctures. Frons somewhat shining with widely spaced indistinct fine punctures and scattered coarse punctures: coarse and fine punctures widely spaced on disc of first gaster tergite. Funiculus segments two and three always less than twice as long as wide. Length: 4.5-9.0 mm (Collingwood 1979).

Distribution based on Regional Taxon Lists
Palaearctic Region: Albania, Andorra, Armenia, Austria, Belarus, Belgium, Bulgaria, China, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, Iberian Peninsula, Italy, Kazakhstan, Latvia, Lithuania, Luxembourg, Malta, Montenegro, Netherlands, Norway, Poland, Portugal, Republic of Macedonia, Republic of Moldova, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom of Great Britain and Northern Ireland, Uzbekistan.

Biology
Collingwood (1979) - This is the common wood ant of most of lowland Europe building large hill nests of leaves and twigs. Nests may be isolated or in small groups, normally with many queens, up to 100 or more. Various estimates of numbers of workers in a populous nest range from 100,000 to 400,000. This is an aggressive acid squirting but somewhat clumsy species. Foraging trails radiating from a large nest may be up to 100 m or more usually orientated toward suitable aphid bearing trees. Prey is taken somewhat unselectively from both trees and forest floor with any insect, arthropod or earthworm taken back as food to the nest although the main diet as with all species of this group is aphid honey dew. These ants mass in tight clusters on the top of the mound in the early spring sunshine. The first queen laid eggs develop into alate sexuals which fly off the nest early in the summer from May until early July. New nests arise from colony splitting in the spring but occasionally single queens may secure adoption in nests of Formica fusca.

A monogynous form of F. rufa occurs in continental Europe and probably locally in Sweden but has never been found in England. This is the Formica rufa rufa of Gösswald (1941). Average worker size of this form is generally large and samples are usually conspicuously hairy. Many males from such isolated colonies in the Netherlands may have one or more coarse hairs protruding from the genae below the eyes and very occasionally queens may have very short sparse hairs on the basal face of the gaster but all such individuals have the widely spaced puncturation of true F. rufa and although workers may have a few hairs on the upper surface of the hind femora they never form a close fringe as in other species. This form has also sometimes been referred to as F. piniphila Schenck, 1852. Although generally monogynous, similar hairy specimens occur on the coastal dunes of the Netherlands in polygynous colonies.

Nomenclature

 *  rufa. Formica rufa Linnaeus, 1761: 426 (q.m.) EUROPE. [Not Linnaeus, 1758: 580 (w.); see Yarrow, 1954b: 313; Yarrow, 1955a: 5.] Latreille, 1802c: 143 (w.q.m.); Wheeler, G.C. & Wheeler, J. 1953c: 166 (l.). Senior synonym of apicalis: Roger, 1862c: 287; of dorsata: Stephens, 1829: 357; Nylander, 1846a: 902; of ferruginea: Emery, 1892b: 161; of gaullei: Yarrow, 1955a: 4; Bernard, 1967: 308; of major: Emery & Forel, 1879: 450; Yarrow, 1955a: 3; Dlussky, 1967a: 93; of meridionalis: Yarrow, 1955a: 4; Dlussky & Pisarski, 1971: 184; of piniphila: Mayr, 1855: 328; Yarrow, 1955a: 4; Betrem, 1960b: 76; of rufopratensis: Karavaiev, 1936: 240; Dlussky, 1967a: 93. Material of the unavailable names bondroiti, emeryi referred here by Yarrow, 1955a: 4; of major Gösswald by Dlussky, 1967a: 93. Current subspecies: nominal plus angusticeps, brevisetosa, constricta, obscurata, rufopratensoides, rufobrevisetosa, tshugunovi. See also: Wheeler, W.M. 1913f: 425; Donisthorpe, 1915d: 245; Yarrow, 1955a: 3; Dlussky, 1967a: 93; Kutter, 1977c: 273; Collingwood, 1979: 141; Douwes, 1979: 187; Douwes, 1981: 213; Pavan, 1981: 1; Gösswald, 1989: 16; Atanassov & Dlussky, 1992: 277; Czechowski & Douwes, 1996: 125.
 * ferruginea. Formica ferruginea Christ, 1791: 512, pl. 60, fig. 10 (w.) no locality. Junior synonym of rufa: Emery, 1892b: 161.
 * dorsata. Formica dorsata Panzer, 1798: no. 1651 (q.) AUSTRIA. Junior synonym of rufa: Stephens, 1829: 357; Nylander, 1846a: 902.
 * piniphila. Formica piniphila Schenck, 1852: 28 (w.q.m.) GERMANY. Junior synonym of rufa: Mayr, 1855: 328; Emery & Forel, 1879: 450; Dalla Torre, 1893: 208. Revived from synonymy as subspecies of rufa: Forel, 1915d: 57. Revived status as species: Bondroit, 1918: 57. Subspecies of rufa: Emery, 1925b: 253; Stitz, 1939: 338. Junior synonym of major: Betrem, 1953: 325; of rufa: Yarrow, 1955a: 4; Betrem, 1960b: 76; Dlussky, 1967a: 93; Bernard, 1967: 308; Kutter, 1977c: 273.
 * apicalis. Formica apicalis Smith, F. 1858b: 49 (q.) "South America"; locality in error. [Unresolved junior primary homonym of apicalis Latreille, 1802c: 204, above.] Junior synonym of rufa: Roger, 1862c: 287.
 * rufopratensis. Formica rufa var. rufopratensis Forel, 1874: 53 (w.q.) SWITZERLAND. Stitz, 1939: 338 (m.). Subspecies of pratensis: Dalla Torre, 1893: 205; of rufa: Emery, 1925b: 253; Karavaiev, 1927c: 282. Junior synonym of rufa: Karavaiev, 1936: 240; Dlussky, 1967a: 93.
 * meridionalis. Formica rufa var. meridionalis Nasonov, 1889: 17 (w.) RUSSIA. Subspecies of rufa: Ruzsky, 1905b: 330; Emery, 1909b: 186; Karavaiev, 1936: 244. Junior synonym of rufa: Yarrow, 1955a: 4; Dlussky & Pisarski, 1971: 184.
 * gaullei. Formica gaullei Bondroit, 1917a: 176, fig. 1 (w.) FRANCE. Subspecies of rufa: Emery, 1925b: 253; Stitz, 1939: 339; Röszler, 1950: 213. Junior synonym of rufa: Yarrow, 1955a: 4.