Hylomyrma adelae

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Hylomyrma adelae is known only from montane evergreen forest in the Cochabamba region of Bolivia, specifically at 109km east of Cochabamba near Lagunitas ^[1]. The type specimens were collected from leaf-litter samples in wet forest, suggesting this species lives in damp, shaded forest floor environments ^[1][2].
• Colony Type: Colony structure is unconfirmed for this newly described species.
• Size & Growth:
  • Queen: 5.26-5.30 mm ^[1]
  • Worker: 4.54-4.83 mm ^[1]
  • Colony: Unknown, no colony size data available for this species
  • Growth: Unknown, no development studies exist for this species
  • Development: Unknown, estimated 6-10 weeks based on typical Myrmicinae development at warm temperatures (No direct studies on development time exist. Estimates based on related genus patterns.)
• Antkeeping:
  • Temperature: Keep at 20-24°C. This range is inferred from their wet forest habitat in Bolivia's subtropical montane regions ^[1].
  • Humidity: High humidity is essential. These ants live in wet forest leaf-litter, so aim for 70-85% humidity in the nesting area. Keep the substrate consistently moist but not waterlogged ^[1][2].
  • Diapause: Unknown, no studies on overwintering behavior exist. Given their origin in Bolivia's tropical montane forests, they likely do not require true hibernation.
  • Nesting: Based on collection data from leaf-litter samples, they likely nest in fallen logs, rotten wood, between leaves, or inside natural cavities of superficial soil layers ^[1][2]. In captivity, a naturalistic setup with moist substrate, leaf litter, and small hiding spots works well. Test tubes with cotton can work if humidity is maintained in a closed setup.
• Behavior: Behavior is unstudied in captivity. Based on their small size and wet forest origin, they are likely docile. Workers probably forage in the leaf-litter layer, searching for small prey and honeydew. Their tiny size means escape prevention is critical, they can squeeze through standard formicarium gaps. Use fine mesh barriers and ensure all connections are sealed.
• Common Issues: high humidity requirements can lead to mold problems if ventilation is inadequate, escape prevention is critical due to their tiny size, standard barriers may not contain them, very limited availability since the species was only recently described in 2021, no captive breeding data exists, so established colony care is unproven, wild-caught colonies may be stressed from collection and require careful acclimatization

Nesting Preferences

In the wild, Hylomyrma adelae has been collected exclusively from leaf-litter samples in wet evergreen forests in Bolivia's Cochabamba region ^[1]. This suggests they nest in humid microhabitats within the forest floor, likely in fallen logs, rotting wood, between accumulated leaves, or in natural cavities within the top layers of soil ^[1][2]. The wet forest environment indicates they require consistently moist conditions. In captivity, replicate this by providing a naturalistic setup with moist substrate (like a mixture of soil and organic material), leaf litter for cover, and small cavities or pieces of wood for nesting. Alternatively, a well-humidified test tube setup or acrylic nest with moisture chambers can work if you maintain high ambient humidity. Avoid dry nests entirely.

Feeding and Diet

Dietary requirements are not specifically documented for Hylomyrma adelae. Based on typical Myrmicinae feeding patterns, they likely consume small insects, honeydew, and nectar. As small ants living in leaf-litter, they probably forage for tiny prey like springtails, mites, and small insects. In captivity, offer a varied diet including small live prey (fruit flies, pinhead crickets, or similar-sized insects), sugar water or honey, and protein sources. Feed small amounts every 2-3 days and remove uneaten food to prevent mold. Since they come from a wet forest environment, ensure fresh water is always available.

Temperature and Humidity Requirements

Based on their origin in Bolivia's montane evergreen forests near Cochabamba, Hylomyrma adelae likely prefers moderate temperatures around 20-24°C with high, stable humidity ^[1]. The wet forest habitat indicates they are not tolerant of dry conditions. Use a heating cable on one side of the nest if your room temperature falls below 20°C, but always provide a temperature gradient so ants can regulate their own exposure. Humidity should be maintained at 70-85%, use a moist substrate, occasional misting of the outworld, and ensure good (but not excessive) ventilation to prevent stagnation while retaining moisture. Monitor for condensation on nest walls as an indicator of adequate humidity.

Acquisition and Availability

Hylomyrma adelae was described in 2021,making it one of the most recently described ant species available in the hobby ^[1]. This means established captive colonies are extremely rare or may not exist yet outside of scientific collections. If you obtain this species, it will likely be from a specialized breeder or as wild-caught specimens. Wild-caught queens require careful acclimatization to captivity. Given the limited data on this species in captivity, expect a learning curve and be prepared to adjust care based on colony response. Document your observations carefully, captive care data for this species would be valuable to the antkeeping community.

Frequently Asked Questions

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References