Lasius neglectus is a polygynous, sometimes invasive, ant of the genus Lasius. The ant was identified in 1990 after establishing a colony in Budapest, Hungary. Superficially, they are similar in appearance to the common black garden ant, Lasius niger, but have significantly different behavioural patterns, particularly in the social structure within colonies.
Lasius neglectus occupies 'super colonies', systems of interconnected nests with many queens, estimated to be over 35,500 in some colonies. The queens, instead of moving to a new nest to start a new colony, will mate within the existing colony. Unlike most ant species, queens mate underground and are incapable of flight. As the occupants of these colonies are related, they do not demonstrate territorial aggression.
Lasius neglectus can outnumber native European varieties of ant by 10 to 100 times in infested gardens and, as such, has been considered a pest in many central European countries. The species has spread as far as Jena in Germany, Ghent in Belgium and Warsaw in Poland. A colony has been reported in Gloucestershire in England, where it demonstrates an affinity for outdoor electrical fittings.
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- Xavier Espadaler and Víctor Bernal (May 11, 2006). "Lasius neglectus – pest status". Centre de Recerca Ecològica i Aplicacions Forestals. http://www.creaf.uab.es/xeg/lasius/Ingles/peststatus.htm. Retrieved August 1, 2009.
- James Randerson (December 3, 2008). "'Super ants' threaten UK gardens, scientists warn". The Guardian. http://www.guardian.co.uk/environment/2008/dec/03/super-ants-invade-uk-wildlife-gardens. Retrieved August 1, 2009.
- Xavier Espadaler and Víctor Bernal (July 24, 2009). "Lasius neglectus – distribution". Centre de Recerca Ecològica i Aplicacions Forestals. http://www.creaf.uab.es/xeg/lasius/Ingles/distribution.htm. Retrieved August 1, 2009.
- "Power-Crazed Super Ants Invade England". Sky News. August 1, 2009. http://news.sky.com/skynews/Home/World-News/Ants-Invade-England-Asian-Super-Ants-Found-At-Hidcote-Manor-Gloucestershire/Article/200908115351611?f=vg. Retrieved August 1, 2009.
- Xavier Espadaler and Víctor Bernal (April 29, 2008). "Lasius neglectus – interactions". Centre de Recerca Ecològica i Aplicacions Forestals. http://www.creaf.uab.es/xeg/lasius/Ingles/interactions.htm. Retrieved August 1, 2009.