Kalathomyrmex emeryi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to cis-Andean South America: Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Peru, and Venezuela. Lives in sandy soil in open, dry areas like river beaches, dry forest clearings, and grasslands. Nests are common on sandy river beaches and in spots with no plants ^[1][4].
• Colony Type: Monogyne (single-queen colonies). Queens mate with only one male (monandrous) ^[5]. Colonies stay small, typically around 100 workers ^[5].
• Size & Growth:
  • Queen: 3.0-3.4 mm ^[1]
  • Worker: 2.4-4.0 mm ^[1]
  • Colony: Around 100 workers in studied colonies ^[5]
  • Growth: Moderate, inferred from related fungus-farming ant patterns
  • Development: 6-10 weeks, estimated based on typical Attini development at warm temperatures (Direct development data unavailable, estimates based on related lower agriculture fungus-farming ants)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This species comes from warm South American habitats and Amazon floodplains, so stable warmth supports colony growth and fungus cultivation ^[1]. A heating cable on one side of the nest creates a good gradient.
  • Humidity: Moderate to high. Keep the nest substrate consistently moist but not waterlogged. The fungus chamber in particular should stay damp, in the wild these chambers sit 60-100 cm deep, which means stable, humid conditions underground. Let the surface of the substrate dry slightly between waterings.
  • Diapause: Unknown, no specific research on hibernation requirements. Given its tropical/subtropical origin, a true diapause is probably not necessary, but a slight cooling period in winter (around 20-22°C) might be beneficial.
  • Nesting: Y-tong (AAC) or plaster nests work well. Provide deep substrate (at least 10-15 cm) to match their natural deep nest architecture. Use sandy or loose substrate that holds moisture well. Include a dedicated fungus chamber area.
• Behavior: Workers forage mostly at night but are also active during the day, even in direct sun and high temperatures ^[1]. They are not aggressive and tend to flee when disturbed. As fungus farmers, they depend on a fungal cultivar, the queen brings a starter pellet when she founds the colony. Workers collect insect feces (mainly from butterflies and moths) to feed the fungus ^[1]. Escape risk is moderate: workers are small but not particularly fast. Standard test tube or formicarium barriers should keep them contained.
• Common Issues: Losing the fungal cultivar kills the colony, they cannot survive without their fungus., Flood tolerance is impressive, but overwatering the nest can still drown the colony or cause mold problems in the fungus chamber., Small colony size means slower population growth compared to faster-breeding species., Specialized diet, they need insect feces as fungus substrate, not typical ant foods like honey or protein., Temperature sensitivity, being from warm climates, they may struggle in rooms below 22°C.

Fungus Farming Requirements

Kalathomyrmex emeryi belongs to the lower agriculture system of fungus-farming ants and is one of the oldest lineages in the Attini tribe ^[6][7]. Like all attine ants, it's completely dependent on its fungal cultivar, the queen carries a fungal starter pellet when she founds a new colony, and that fungus must survive for the colony to live ^[8]. In the wild, workers collect feces from other insects, especially butterflies and moths (Lepidoptera), to feed their fungus ^[1]. This means you cannot feed them standard ant protein or sugar water. Instead, you need to provide the right substrate for fungus growth, typically a mix of insect droppings, decaying plant matter, or specialized fungus-farming ant food mixes available from ant supply stores. Wild fungus chambers sit 60-100 cm deep, suggesting they need stable, humid underground conditions ^[1]. In your setup, give them a dedicated chamber for fungus cultivation that stays consistently moist.

Flood Tolerance and Nest Architecture

One of the most amazing traits of K. emeryi is its incredible flood tolerance. In the Amazon, nests can be completely underwater for months during the rainy season. When the water recedes, the ants just reopen the entrance and go back to normal activity ^[1]. This adaptation is probably linked to their sandy soil nesting habits, loose substrate allows gas exchange even when waterlogged. Dr. M. Verhaagh observed a nest in Peru that stayed covered by high water for several days, and the ants came out as soon as the water level dropped ^[1]. For keepers, this means you don't need to panic if the nest floods temporarily, this species is built for it. But the fungus inside may be more sensitive, so avoid long-term waterlogging of the fungus chamber.

Feeding and Diet

As a fungus-farming ant, K. emeryi has very specific dietary needs. The ants don't eat the insects they collect directly, instead, they use insect feces and other organic matter as fertilizer for their fungal garden, which is the actual food for larvae and adults ^[1]. Workers forage mainly at night but are also active during the day ^[1]. In captivity, provide either commercial fungus-growing ant food mixes (sold for Attini species) or make your own substrate. Some keepers use a blend of insect droppings, oat flour, and other organic materials. Never feed sugar water or honey as a primary food, they don't need sugar sources like many other ants. Protein-rich foods should only be offered as fungus substrate, not as direct ant food. Watch whether the fungus accepts new material before adding large amounts.

Temperature and Seasonal Care

Given its range across tropical and subtropical South America, K. emeryi likes it warm. Keep temperatures between 24-28°C to mimic their Amazon and river beach habitats ^[1]. They've been seen active during both day and night, even in direct sunlight and high heat, so they have good heat tolerance ^[1]. A heating cable on one side of the nest creates a temperature gradient so the colony can choose. As for diapause, no specific research exists, but given their tropical origins, a true hibernation is probably not needed. Still, a slight temperature drop in winter (to around 20-22°C) might help simulate natural seasonal cycles without stressing the colony. Always keep the fungus chamber warm even if the ants show less activity.

Unique Morphology and Identification

K. emeryi has several unique features that set it apart from other fungus-farming ants. The most obvious is the psammophore, a bundle of stiff bristles on the face that helps move sand particles ^[1][2]. This is different from the psammophore in related genera: it comes from the middle of the clypeus, not the front edge, making it a unique derived trait ^[2]. Workers also lack the median clypeal seta found in all other Attini, this is a defining trait of the genus ^[2]. Their square head shape and reduced frontal lobes are also distinctive. When identifying your ants, look for yellowish to reddish-brown color with darker markings on the gaster, a slender body, and a heart-shaped postpetiole with a deep rear impression ^[1]. These ants are small (under 4 mm) but stocky, not delicate.

Frequently Asked Questions

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References