Workers range from roughly 2 mm garden workers to soldiers around 15–16 mm; queens commonly exceed 25 mm.
Fine-art photographic collection
Atta laevigata
A vast underground fungus farm that reshapes soil, vegetation and nutrient flow.
About this species
South American leafcutter ant
Atta laevigata(Smith, 1858)
Information reviewed15 July 2026
Atta laevigata is one of South America’s largest leafcutter ants. Its workers cut vegetation to provision subterranean fungus gardens, and large colonies move enormous quantities of soil. The resulting nest mounds and nutrient-rich refuse zones make the species an important ecosystem engineer.
Taxonomy
Animalia · Arthropoda · Insecta · Hymenoptera · Formicidae · Myrmicinae · Attini · Atta
Accepted · checked 2026-07-15
Tropical and subtropical South AmericaBroad documented localities — not a complete range map.
Widespread in northern, central and eastern South America, from Colombia and Venezuela through Brazil, Bolivia and Paraguay to northern Argentina.
Savanna, Cerrado, forest edges, pasture, plantations and disturbed landscapes, usually where deep, well-drained soils permit extensive nests.
Foraging timing shifts with heat and moisture. Colonies often use conspicuous cleared trails linking the nest to selected plants.
Vegetation is converted into substrate for a cultivated fungus. The fungus feeds the brood and supports the colony; adults also ingest plant liquids.
A mature colony contains one queen and a highly polymorphic workforce that may number in the millions, distributed through extensive fungus chambers.
What makes this species remarkable?
Large nests can alter soil chemistry, aeration and plant establishment well beyond the entrances visible at the surface.
The smooth, shining head of the largest workers is one of the features behind the species name laevigata, meaning polished or smooth.
In parts of Colombia, winged queens are traditionally collected as food and are known as hormigas culonas.