Linepithema

is an inconspicuous but ecologically important ant of Neotropical forests and mountains. One species, the Argentine ant L. humile, has become a significant pest in mediterranean climates worldwide.

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Linepithema humile, the Argentine ant, tending a citrus scale insect for honeydew.

Davis, California, USA

Argentine ants (Linepithema humile tending scale insects on an orange tree in suburban California.

Davis, California, USA

Linepithema humile, the Argentine Ant.

California, USA

A queen and worker Argentine ant, Linepithema humile.

Córdoba, Argentina

Argentine ants (Linepithema humile) fighting. Argentine ants typically form large supercolonies comprising millions of ants and thousands of nests. Within these massive supercolonies fighting is rare, but ants from neighboring supercolonies readily attack each other.

Córdoba, Argentina

Workers tend to a queen in a laboratory colony of Argentine Ants (Linepithema humile).

California, USA

Argentine ants (Linepithema humile), an aggressive pest species introduced by human commerce to California, attack a native Pogonomyrmex harvester ant. Native ants in many places around the world have disappeared in areas invaded by Argentine ants.

Davis, California, USA

Linepithema humile, the Argentine ant.

Davis, California, USA

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Linepithema

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