(Formica spp.)
Overview • Description • Distribution • Taxonomy
Description |
Most Formica ants are large, more than ⅛″ (4 mm) in length. On the worker, the antennae have twelve segments, on the male they have thirteen. They are inserted at or adjacent to the plate on the face (clypeus). The jaws (mandibles) have 7 to 10 prominent teeth. The simple eyes (ocelli) are large and conspicuous. The front part of the body (mesosoma) has three exoskeletal plates on the upper side. The first plate (pronotum) and second plate (mesonotum) cover the thorax. Together they are referred to as the promesonotum. The third plate (propodeum) covers the first segment of the abdomen which is fused to the thorax. When viewed from the side, the propodeum is distinctly lower than the level of the promesonotum. This gives the mesosoma a distinctly “lumpy” appearance. The upper surface at the front of the propodeum is usually longer than the sloping surface at the rear. Sometimes it is evenly rounded, without a clear separation between the upper and rear surfaces. The mesosoma and the rear part of the body (metasoma) are connected by a constricted second segment (petiole). There is a single raised bump (node) on the petiole. |
Distribution |
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Sources |
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6/26/2025 | ||
Occurrence |
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Taxonomy |
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Order |
Hymenoptera (ants, bees, wasps, and sawflies) |
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Suborder |
Apocrita (narrow-waisted wasps, ants, and bees) |
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Infraorder |
Aculeata (ants, bees, and stinging wasps) |
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Superfamily |
Formicoidea (ants) |
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Family |
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Subfamily |
Formicinae |
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Tribe |
Formicini |
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Subordinate Taxa |
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Synonyms |
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Common Names |
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wood ants field ants mound ants thatching ants |
Glossary
Clypeus
On insects, a hardened plate on the face above the upper lip (labrum).
Mesonotum
The principal exoskeletal plate on the upper (dorsal) part of the middle segment of the thorax of an insect.
Mesosoma
In Hymenoptera: the front part of the body, consisting of all three segments of the thorax and the first segment of the abdomen, to which the wings are attached.
Metasoma
In Hymenoptera: the armored rear part of the body, consisting of the second segment of the abdomen and all segments posterior to it.
Petiole
On plants: The stalk of a leaf blade or a compound leaf that attaches it to the stem. On ants and wasps: The constricted first one or two segments of the rear part of the body.
Ocellus
Simple eye; an eye with a single lens. Plural: ocelli.
Pronotum
The exoskeletal plate on the upper side of the first segment of the thorax of an insect.
Propodeum
In Hymenoptera: the last segment of the thorax, anatomically the first segment of the abdomen.
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Dan W. Andree |
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2 Ants & a Lady bug... |
Bill Reynolds |
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The ant is tending to aphids on Fireweed. |
MinnesotaSeasons.com Photos |
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Visitor Sightings |
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Dan W. Andree 6/23/2025 |
Location: Frenchman’s Bluff SNA 2 Ants & a Lady bug... |
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Bill Reynolds 7/14/2003 |
Location: Pennington Co. Minnesota The ant is tending to aphids on Fireweed. |
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MinnesotaSeasons.com Sightings |
Created: 11/3/2013 Last Updated: © MinnesotaSeasons.com. All rights reserved. |