Workers are polymorphic, from small garden workers to much larger cutters and defenders, generally within a few to roughly 10 millimetres.
Fine-art photographic collection
Acromyrmex volcanus
A rainforest farmer cultivating fungus beneath the forest floor.
About this species
Volcano leafcutter ant
Acromyrmex volcanusWheeler, 1937
Information reviewed15 July 2026
Acromyrmex volcanus is a Costa Rican leafcutter ant that harvests plant material to cultivate a specialised fungus. Unlike open-country Atta species, it is strongly associated with mature wet forest, where its nests and foraging activity can be surprisingly inconspicuous.
Taxonomy
Animalia · Arthropoda · Insecta · Hymenoptera · Formicidae · Myrmicinae · Attini · Acromyrmex
Source checked · checked 2026-07-15
Costa RicaBroad documented localities — not a complete range map.
Known principally from Costa Rica, especially the wet Atlantic slope from lowlands to about 1,000 metres.
Mature lowland and premontane wet forest, with nests in soil and concealed sites beneath vegetation.
Foraging columns transport selected vegetation to the nest, where smaller workers process it for the fungus gardens.
The ants do not eat the leaves directly; plant fragments feed the cultivated fungus that supports the colony.
Colonies contain a queen and a polymorphic workforce organised around foraging, substrate preparation, garden care and defence.
What makes this species remarkable?
It is especially characteristic of mature Costa Rican wet forest.
The fungus garden is the colony’s agricultural crop and principal larval food.
Different worker sizes perform different stages of the farming process.
Sources and scientific references
More photographs
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