Kalathomyrmex emeryi

Kalathomyrmex emeryi

Kalathomyrmex emeryi is the sole member of its genus, making it a truly unique fungus-farming ant. Workers measure 2.4-4.0mm and display a distinctive yellowish to reddish-brown coloration with brown markings on the gaster, postpetiole, and head vertex ^[1]. This species is easily recognized by its square-shaped head, reduced frontal lobes, and a unique psammophore, specialized hairs on the face that help it move sand ^[1]. Unlike other Attini ants, females completely lack the median clypeal seta, a trait found in no other ant genus ^[2]. The species inhabits open, arid sandy environments across northern South America, from Colombia and Venezuela down to Argentina, including the seasonally dry Caatinga biome of northeastern Brazil and Amazon river beaches ^[1][3]. What makes K. emeryi remarkable is its ability to survive months of flooding, nests in the Amazon can be submerged underwater for extended periods, with ants reopening their nests once water recedes ^[1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to cis-Andean South America, found in Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Peru, and Venezuela. Inhabits sandy soils in open, arid areas including river beaches, dry forest clearings, and grassland habitats. Nests are commonly found at sandy river beaches and areas devoid of vegetation ^[1][4].
• Colony Type: Monogyne (single-queen colonies). Colonies are relatively small, typically reaching around 100 workers ^[5]. Queens are known to be monandrous, mating with only one male ^[5].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: 3.0-3.4mm ^[1]
  • Worker: 2.4-4.0mm ^[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 originates from warm South American habitats and Amazon floodplains, so elevated temperatures support colony growth and fungus cultivation ^[1]. A heating cable on one side of the nest creates a suitable gradient.
  • Humidity: Moderate to high. Maintain consistently moist substrate in the fungus chamber area. The deep nest architecture (60-100cm) suggests they prefer stable, humid underground conditions. Allow the substrate surface to dry slightly between water additions, but the fungus chamber area should remain damp.
  • Diapause: Unknown, no specific research on hibernation requirements. Based on tropical/subtropical origin, diapause may not be required, but a slight cooling period during winter months may be beneficial.
  • Nesting: Y-tong (AAC) or plaster nests work well for this species. Provide a deep nesting area (at least 10-15cm of substrate depth) to accommodate their natural deep nest architecture. Use sandy or loose substrate that holds moisture well. The nest should have a dedicated fungus chamber area.
• Behavior: Workers are primarily nocturnal but show high daytime activity as well, even in direct sun and high temperatures ^[1]. They are not aggressive and typically flee when disturbed. As fungus farmers, they require a fungal cultivar, the queen carries the fungus starter when she founds the colony. Workers forage for insect feces (especially Lepidoptera) to feed their fungus ^[1]. Escape risk is moderate, workers are small but not particularly fast or agile. Standard test tube or formicarium barriers should suffice.
• Common Issues: Fungal cultivar loss can be fatal, this species cannot survive without their fungus, unlike some generalist ant species, Flood tolerance is a double-edged sword, while resilient to water, overwatering the nest can drown the colony or cause fungal problems, Small colony size means slower population growth compared to faster-breeding species, Specialized diet requires specific substrate, they forage for insect feces, not typical ant foods, Temperature sensitivity, being from warm climates, they may struggle in cool rooms below 22°C

Fungus Farming Requirements

Kalathomyrmex emeryi belongs to the lower agriculture system of fungus-farming ants, one of the oldest lineages in the Attini tribe ^[6][7]. Like all attine ants, they are obligately dependent on their fungal cultivar, the queen carries a fungal starter pellet when she founds a new colony, and this fungus must be maintained for the colony to survive ^[8]. In the wild, workers forage for feces of other insects, primarily Lepidoptera (butterflies and moths), to feed their fungus ^[1]. This is a critical point for keepers: you cannot simply feed this ant standard protein foods. Instead, you must provide appropriate substrate for fungus growth, typically a mixture that includes insect droppings, decaying plant matter, or specialized fungus-growing ant food mixes available from ant suppliers. The fungus chambers in wild nests sit 60-100cm deep, indicating they prefer stable, humid underground conditions ^[1]. Your captive setup should include a dedicated chamber for fungus cultivation that stays consistently moist.

Flood Tolerance and Nest Architecture

One of the most remarkable traits of K. emeryi is its extraordinary flood tolerance. In the Amazon basin, nests become completely submerged for months during the rainy season. When floodwaters recede, the ants simply reopen their nest entrance and resume normal activity ^[1]. This adaptation is likely tied to their sandy soil nesting preferences, the loose substrate allows gas exchange even when waterlogged. Dr. M. Verhaagh documented this behavior in Peru, observing a nest near a riverbank that remained covered by high water for several days, only to have ants emerge once water levels returned to normal ^[1]. For antkeepers, this means you should not panic if your nest experiences temporary flooding, this species is built for it. However, the fungus inside the nest may be more sensitive than the ants themselves, so avoid prolonged waterlogging of the fungus chamber.

Feeding and Diet

As a fungus-farming ant, K. emeryi has highly specialized dietary needs. The ants do not eat the insects they collect directly, they use insect feces and other organic matter as substrate to cultivate their fungal garden, which is the actual food source for both larvae and adult ants ^[1]. Workers forage primarily at night but remain active during daytime as well ^[1]. In captivity, you will need to provide either commercial fungus-growing ant food mixes designed for Attini ants, or create your own substrate mixture. Some keepers use combinations of insect droppings, oat flour, and other organic materials. Never feed this species sugar water or honey as a primary food source, they do not use sugar sources like many other ants. Protein-rich foods should be offered only as fungus substrate, not as direct ant food. Observe whether the fungus accepts new substrate additions before offering large quantities.

Temperature and Seasonal Care

Based on its distribution across tropical and subtropical South America, K. emeryi prefers warm conditions. Aim for temperatures in the 24-28°C range, which mimics their natural Amazon and river beach habitats ^[1]. They have been observed active during both day and night, even in direct sunlight and high temperatures, indicating good heat tolerance ^[1]. A heating cable placed on one side of the nest can create a temperature gradient, allowing the colony to self-regulate. Regarding diapause, no specific research exists, but given their tropical origins, a true hibernation is likely not required. However, slight temperature reductions during winter months (dropping to around 20-22°C) may help simulate natural seasonal cycles without stressing the colony. Always ensure the fungus chamber remains warm even if the colony shows reduced activity.

Unique Morphology and Identification

K. emeryi possesses several unique morphological features that set it apart from other fungus-farming ants. The most distinctive is the psammophore, a cluster of stiff bristles on the face that helps the ant move sand particles ^[1][2]. This is not the same as the psammophore found in related genera, it arises from the middle of the clypeus rather than the anterior margin, making it a unique derived trait ^[2]. Workers also lack the median clypeal seta found in all other Attini species, this is a defining characteristic of the genus ^[2]. Their square (subquadrate) head shape and reduced frontal lobes further distinguish them. When identifying your ants, look for the yellowish to reddish-brown coloration with brown markings on the gaster, the relatively slender body, and the heart-shaped postpetiole with a deep posterior impression ^[1]. These ants are small (under 4mm) but stocky rather than delicate.

Frequently Asked Questions

References