Linepithema humile

Distribution based on Regional Taxon Lists
Afrotropical Region: Lesotho, Namibia, Saint Helena, United Arab Emirates. Australasian Region: Australia, New Zealand, Norfolk Island. Indo-Australian Region: Hawaii, Vanuatu. Nearctic Region: United States. Neotropical Region: Argentina, Bermuda, Brazil, Colombia, Ecuador, French Guiana, Mexico, Paraguay, Uruguay. Palaearctic Region: Balearic Islands, Belgium, Bulgaria, Canary Islands, Channel Islands, Democratic People's Republic of Korea, France, Germany, Gibraltar, Iberian Peninsula, Iran, Japan, Malta, Monaco, Montenegro, Poland, Portugal, Spain, United Kingdom of Great Britain and Northern Ireland.

Europe
This species was introduced into Europe from South America and has become an established and notorious pest in the Mediterranean area, developing very populous multi-queened colonies along the coast. It is sometimes brought into North Europe with plant materials and occasionally colonises heated premises. It does not appear to be able to establish outside in northern latitudes but is present and said to be increasing in the Channel Islands. (Collingwood 1979)

Nomenclature

 *  humile. Hypoclinea humilis Mayr, 1868b: 164 (w.) ARGENTINA. Forel, 1908c: 395 (m.); Newell, 1908: 28 (q.); Wheeler, G.C. & Wheeler, J. 1951: 186 (l.); Crozier, 1969: 250 (k.). Combination in H. (Iridomyrmex): Mayr, 1870b: 959; in Iridomyrmex: Emery, 1888d: 386; in Linepithema: Shattuck, 1992a: 16. Senior synonym of arrogans, riograndensis: Wild, 2004: 1207. See also: Gallardo, 1916a: 97; Bernard, 1967: 251; Collingwood, 1979: 33; Smith, D.R. 1979: 1418; Ward, 1987: 1; Wheeler, G.C. & Wheeler, J. 1990a: 465; Shattuck, 1994: 123; Wild, 2007a: 61; Solis, Fox, Rossi & Bueno, 2010: 19.
 * arrogans. Iridomyrmex humilis var. arrogans Chopard, 1921: 237 (footnote),:241, figs. 1-31 (w.q.m.l.) FRANCE. [Also described as new by Santschi, 1929d: 306 (in key).] Combination in Linepithema: Shattuck, 1992a: 16. Junior synonym of humile: Bernard, 1967: 251. Revived from synonymy as subspecies of humile: Shattuck, 1992a: 16. Junior synonym of humile: Wild, 2004: 1207.
 * riograndensis. Iridomyrmex riograndensis Borgmeier, 1928b: 64 (w.) BRAZIL. Combination in Linepithema: Shattuck, 1992a: 16. Junior synonym of humile: Wild, 2004: 1207.

Additional References

 * Abril, S., Diaz, M., Enriquez, M.L. & Gomez, C. 2013. More and bigger queens: a clue to the invasive success of the Argentine ant (Hymenoptera: Formicidae) in natural habitats. Myrmecological News 18, 19-24.
 * Lester,P.J., Baring,C.W., Longson,C.G. & Hartley,S. 2003. Argentine and other ants (Hymenoptera: Formicidae) in New Zealand horticultural ecosystems: distribution, hemipteran hosts, and review. New Zealand Entomologist 26: 79-89.