Formicoxenus nitidulus

Identification
Reddish yellow to brown: whole surface of body smooth and shining with scattered acute pale hairs. Antennal club 3 segmented as long as rest of funiculus: propodeal spines short, set horizontally. Length: 2.8-3.4 mm (Collingwood 1979).

Distribution
Spain to Eastern Siberia. North Italy to latitude 70º N (Collingwood 1979).

Distribution based on Regional Taxon Lists
Palaearctic Region: Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iberian Peninsula, Italy, Norway, Poland, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom of Great Britain and Northern Ireland.

Biology
This species exhibits a form of Social Parasitism.

Collingwood (1979) - This ant occurs only in the nests of Formica rufa and allied mound building species. It is ignored by its host among which the inquiline species moves freely. Individual nests contain only a few individuals, up to about 100, but often several nests are present within one mound of the host. Nests are located in fragments of wood, hollow twigs, bases of old bracken stems and in the earth floor of the Formica mound. Intermediate forms between queen and worker are common and individuals normally remain concealed within the nests but may wander on the mound surface on warm dull days. It is not known to feed on the Formica brood but in captivity will destroy Leptothorax larvae. Males and winged females may be found during July and August. Mating occurring on the surface of the Formica mound.

Nomenclature

 *  nitidulus. Myrmica nitidula Nylander, 1846b: 1058 (w.) FINLAND. Nylander, 1849: 34 (q.); Mayr, 1855: 419 (m.). Combination in Formicoxenus: Mayr, 1855: 418. Senior synonym of laeviuscula: Mayr, 1855: 418; of picea: Francoeur, Loiselle & Buschinger, 1985: 380. See also: Kutter, 1977c: 144; Francoeur, Loiselle & Buschinger, 1985: 380; Radchenko, 2007: 32.
 * laeviuscula. Myrmica laeviuscula Foerster, 1850a: 54 (q.) GERMANY. Junior synonym of nitidulus: Mayr, 1855: 418.
 * picea. Leptothorax nitidulus var. picea Wasmann, 1906: 120 (w.) LUXEMBOURG. Junior synonym of nitidulus: Francoeur, Loiselle & Buschinger, 1985: 380.

Additional References

 * Adlerz, G. 1885 ("1884"). Myrmecologiska studier. I. Formicoxenus nitidulus Nyl. Öfversigt af Kongliga Vetenskaps-Akademiens Förhandlingar. Stockholm 41(8):43-64. [1885]


 * Collingwood, C. A. 1979. The Formicidae (Hymenoptera) of Fennoscandia and Denmark. Fauna Entomol. Scand. 8:1-174.