Fauna
Insect

Rimose Fungus-farming Ant

Cyphomyrmex rimosus

Rimose fungus-farming ants cultivate a specialized yeast-like fungus rather than the filamentous mycelium grown by larger leafcutter ants, nourishing their gardens with insect droppings, dead arthropods, and decaying plant bits. These tiny, rough-textured ants move slowly through leaf litter and curl up to feign death when disturbed, blending seamlessly into soil grains. Colonies remain small, often housing only a few dozen to a few hundred workers beneath stones, rotting logs, or shallow soil.

Fungus-farmingCrypticGround-dwelling
Rimose Fungus-farming Ant reference
(c) dhasdf, some rights reserved (CC BY) · cc-by
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preySymbiotic yeast-like fungus, Caterpillar frass (as garden substrate), Dead insects (as garden substrate)
Predators
  • Nine-banded Armadillo
  • Ant-eating spiders
  • Ground-foraging lizards
ThreatsHabitat loss, invasive fire ants, and pesticide use
HabitatsLeaf litter, rotting wood, soil beneath stones, tropical and subtropical forests, and shaded gardens
Life spanWorkers live several months; queens can live several years
Classification
  1. FamilyFormicidae
  2. SpeciesCyphomyrmex rimosus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Harmless to humans and pets; safe to observe at close range.
Responsible observation
  • Where to look: Gently lift flat stones or pieces of damp, decaying bark in shaded woods to spot slow-moving workers.
  • Observation: Use a hand lens to see their ridged exoskeleton and the pale yeast nodules inside exposed nest chambers.
  • Disturbance: Replace any turned rocks or logs carefully in their original position to protect the fragile fungus garden.
Related species
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