Lasius nearcticus

Wheeler, 1906

New World Fuzzy Ant

Lasius nearcticus is a of citronella ant in the Formicidae, native to eastern North America. It belongs to a characterized by the production of citronellal, a lemon-scented compound used for alarm communication and defense. The species is part of the Nearctic fauna and has been documented in the eastern United States and parts of Canada.

Lasius nearcticus casent0104774 label 1 by April Nobile. Used under a CC BY 4.0 license.

Lasius nearcticus casent0104774 head 1 by April Nobile. Used under a CC BY 4.0 license.

Lasius nearcticus casent0104774 dorsal 1 by April Nobile. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Lasius nearcticus: //ˈleɪsiəs niˈɑːrk.tɪ.kəs//

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Identification

Lasius nearcticus can be distinguished from by its elbowed , narrow petiole (-waist), and forewings larger than hindwings with few prominent . As a citronella ant, it possesses glands near the that produce aromatic citronellal, detectable as a lemon scent when the is disturbed. Winged reproductive forms emerge from the ground to swarm and mate.

Images

Distribution

Eastern United States and parts of Canada; possibly extends to parts of western Canada and the western United States. Specific distribution records include Vermont.

Seasonality

Winged reproductive forms have been observed swarming in late autumn and early winter. One documented observation reports swarming activity in December in the mid-Atlantic region.

Diet

Lasius nearcticus tends root-feeding aphids, moving them between plants to optimize honeydew production. The ants feed on the sugary honeydew excreted by these aphids. They also hunt soft-bodied prey.

Host Associations

Root-feeding aphids - tended for honeydewAnts move aphids between plant roots to optimize honeydew production

Behavior

When threatened, release citronellal from mandibular glands as an , recruiting nestmates to defend the colony. Glands near the tip produce formic acid, which is directed at as a chemical defense. The is not a wood-destroyer and does not construct damaging tunnels in structures.

Ecological Role

Lasius nearcticus functions as an herder, maintaining mutualistic relationships with root-feeding aphids and facilitating their movement between plants. This interaction influences plant root and nutrient cycling in soil .

Human Relevance

Lasius nearcticus is frequently mistaken for eastern subterranean termites (Reticulitermes flavipes) when winged forms swarm near homes, causing concern among homeowners. Unlike , this does not damage wooden structures. Its citronellal production and formic acid defense are notable chemical characteristics. The served as a study organism for E. O. Wilson during his early entomological work in Rock Creek Park.

Similar Taxa

Reticulitermes flavipes (eastern subterranean termite)Winged swarming forms are frequently confused; have bead-like , broad waist, and equal-sized wings
Lasius alienusHistorically confused taxonomically; L. americanus was placed in synonymy with L. alienus, though they may represent distinct

More Details

Chemical defenses

Lasius nearcticus produces citronellal (lemon-scented compound) from mandibular glands and formic acid from abdominal glands, a dual chemical defense system characteristic of the .