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Myrmica Latreille, 1804
Myrmica is a large genus of ants with around 200 species which are found in the northern hemisphere. They are often omnivorous and several are considered to be useful predators of insect pests, see Myrmica (predators). However, some species are invasive in North America (e.g. Myrmica rubra) and regarded as nuisance pests because of their sting. Others are harmful because they tend and protect aphids. These pest species are treated here.
The species construct underground nests and colonies typically contain 500-1,000 individuals. The workers often have a reddish brown colour. The antennae have 12 segments with the last 3 or 4 forming a club. The mandibles have 7-10 teeth which increase in size towards the tip. Among other important characters of the genus is a spur on the hind tibiae.
Currently, the following pest species have been entered into the system: