Apterostigma dorotheae

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Tropical rainforests of Guyana, South America, specifically around the Oronoque River at junction with New River (tributary of Courantyne River), Paramaketoi, and Kurupukari regions ^[1][2].
• Colony Type: Likely single-queen based on typical Attini patterns, though unconfirmed for this specific species.
• Size & Growth:
  • Queen: Size data unavailable for this species.
  • Worker: Size data unavailable for this species.
  • Colony: Unknown, likely small to moderate based on Apterostigma biology.
  • Growth: Slow
  • Development: Unknown, development timeline unconfirmed for this species. (Development is likely slower than typical ants due to fungal garden maintenance requirements.)
• Antkeeping:
  • Temperature: Keep warm and stable around 24-26°C with a gentle gradient. Tropical species from Guyana require consistent warmth year-round.
  • Humidity: High humidity essential, nest substrate should feel damp to the touch consistently to support the fungal garden. Avoid drying out at all costs ^[2].
  • Diapause: No, tropical species that remains active year-round.
  • Nesting: Requires specialized setup accommodating hanging fungal gardens with veils. Vertical space with ability to suspend garden material is necessary ^[2].
• Behavior: Gentle, slow-moving agricultural ants focused on garden maintenance. Non-aggressive and suitable for observation. Tiny size requires excellent escape prevention with fine mesh barriers.
• Common Issues: fungal garden collapse from humidity fluctuations, the garden dies if too dry or molds if too wet., Escovopsis infection, a parasitic fungus that attacks the ant's garden and can destroy the colony ^[3][4]., inability to found colonies without fungal inoculum, queens need a fungal pellet from the parent nest to start a new garden., high humidity requirements causing general mold issues in the nest setup., tiny worker size means escapes are likely without fine mesh barriers and tight-fitting lids.

Fungal Garden Biology and Care

These ants are obligate fungus-growers, meaning they cannot survive without their fungal cultivar ^[2]. They grow a pterulaceous G2 fungus, a type of coral fungus, which they tend in specialized gardens. The ants do not eat the fungus itself, instead, they consume nutrient-rich structures called gongylidia that the fungus produces specifically for them.

The garden requires precise environmental control. You must maintain high humidity while ensuring adequate ventilation to prevent stagnant air that could harbor harmful molds. The garden itself hangs from the nest ceiling and is draped with veils, thin layers of fungal growth or debris that create a protective envelope around the main garden mass ^[2]. This architecture likely helps maintain stable humidity and protects against contaminants. If the garden dries out, the fungus dies and the colony starves. If it stays too wet, harmful bacteria or competing fungi can take over.

Nest Setup for Hanging Gardens

Standard horizontal nest designs do not work for this species. You need a vertical setup that allows the fungal garden to hang freely from the ceiling of the chamber. The nest should provide overhead attachment points where the ants can suspend their garden.

Use materials that resist mold but allow humidity retention, such as plaster or hydrostone with a rough ceiling texture. Avoid acrylic nests with smooth surfaces that prevent garden attachment. The outworld should be spacious enough to allow foraging but designed to maintain high humidity. You may need to cover ventilation holes with fine mesh to retain moisture while preventing escapes.

Provide the ants with small twigs, dead leaves, or other debris they can use to construct the veils around their garden. The hanging structure is essential to their natural behavior and garden health ^[2].

Temperature and Humidity Management

As a tropical species from Guyana, these ants require warm, stable temperatures between 24-26°C. Use a heating cable or mat on one side of the nest to create a gentle gradient, allowing the ants to regulate their temperature by moving closer or farther from the heat source. Never place heating elements underneath the nest, as this can dry out the fungal garden from below.

Humidity is critical and unforgiving. The substrate should feel damp to the touch at all times. Check daily for signs of drying at the surface. If the garden begins to shrink or discolor, humidity has dropped too low. However, stagnant air promotes mold, so ensure some gentle airflow while maintaining moisture. This balance is the primary challenge in keeping fungus-growing ants.

Feeding and Nutrition

Unlike leafcutter ants that bring fresh leaves to feed their fungus, Apterostigma dorotheae likely collects dead plant material, insect frass, and dead insects to fertilize their garden. Offer small amounts of dead fruit flies, crushed mealworms, or oatmeal as substrate for the fungus. Remove uneaten food promptly to prevent mold.

Do not offer fresh vegetation or large pieces of food that could mold before the fungus processes them. The ants will place food particles on the garden surface where the fungus breaks it down. You may occasionally offer tiny amounts of honey water or sugar water, but protein sources for the fungus are the priority. Watch the garden's response to different foods and adjust based on what the ants actively incorporate into the garden structure.

Colony Founding and Establishment

Founding behavior is unconfirmed for this specific species, but fungus-growing ants typically practice claustral founding with a twist: the queen carries a fungal pellet from her parent colony to inoculate her new garden. This makes captive founding extremely difficult unless you capture a dealate queen with her initial garden already established, or split a mature colony's garden with workers and brood.

Starting from a lone queen without fungus is essentially impossible, as she cannot generate the fungal cultivar from scratch. If attempting to establish a new colony, you must either capture a founding chamber with the queen and her initial garden, or take a fragment from an established captive colony including garden material, workers, and brood. The garden fragment must be large enough to sustain itself while the new colony establishes.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References