Stigmatomma bolabola

Stigmatomma bolabola

Stigmatomma bolabola is a small ant species from the rainforests of Madagascar, first described in 2016. Workers measure around 0.92mm in total length, making them one of the smaller Amblyoponinae species ^[1]. They have a distinctive red-brown body with orange-yellow tips on their gaster and legs, which inspired their name, 'bolabola' is the Malagasy word for rosewood, a Dalbergia species with similar coloring. This species belongs to the sakalava complex within the tsyhady species group and is only known from the worker caste. They were collected in the Makira Forest Protected Area at elevations between 600-1100m in humid rainforest and montane rainforest habitats, specifically from sifted leaf mold and rotting wood ^[1].

This is a newly described species with limited captive care information. Based on its placement in Amblyoponinae and its forest floor habitat, it likely shares care requirements with other Stigmatomma species, small, cryptic ants that prefer humid, shaded conditions and likely prey on small soil arthropods like springtails.

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Makira Forest Protected Area, Madagascar, humid rainforest and montane rainforest ecoregion at 600-1100m elevation. Collected from sifted leaf mold and rotting wood ^[1].
• Colony Type: Unknown colony structure, only worker caste has been described. Based on genus patterns, likely forms small colonies with single queen.
• Size & Growth:
  • Queen: Unknown, queen has not been described ^[1]
  • Worker: 0.92mm total length (WL), head length 0.76mm ^[1]
  • Colony: Unknown, likely small colonies typical of Amblyoponinae
  • Growth: Unknown, likely slow to moderate based on genus patterns
  • Development: Unconfirmed, estimated 6-10 weeks based on related Amblyoponinae species (No direct development data exists for this species. Estimates based on typical Amblyoponinae development patterns at tropical temperatures.)
• Antkeeping:
  • Temperature: Keep around 22-26°C, they come from warm, humid rainforest habitats in Madagascar. A gentle gradient allowing them to choose their preferred temperature is ideal.
  • Humidity: High humidity required, think damp forest floor. Keep the nest substrate consistently moist but not waterlogged, with some drier areas available.
  • Diapause: Unknown, being from tropical Madagascar, they likely do not require a true diapause but may have reduced activity during cooler/drier seasons.
  • Nesting: Natural nesting is in rotting wood and leaf mold. In captivity, a naturalistic setup with moist substrate (soil/peat mix) and small chambers works well. Y-tong or plaster nests with fine chambers can also work given their small size.
• Behavior: Likely cryptic and slow-moving, typical of Amblyoponinae. They are probably predatory on small soil arthropods. Escape risk is moderate given their small size, standard barriers should suffice but fine mesh is recommended. Temperament is likely docile, Amblyoponinae are not known for aggressive swarming or stinging.
• Common Issues: Very limited biological data makes care recommendations uncertain, be prepared to experiment, Small size means escape prevention must be good despite their docile nature, Humidity control is critical, too dry and they will desiccate, Slow growth may test keeper patience, Wild-caught colonies may have parasites or fail to adapt to captivity

Housing and Nest Setup

Stigmatomma bolabola naturally nests in rotting wood and leaf mold in Madagascar rainforests ^[1]. For captivity, a naturalistic setup works best, a shallow container filled with a moist soil/peat mixture that mimics the forest floor. Add pieces of rotting wood or cork bark for them to nest in. Given their tiny size (under 1mm), ensure chambers and passages are appropriately scaled. A Y-tong nest with narrow chambers or a small acrylic/plaster nest can also work. Keep the nest area dark, these are cryptic, light-avoiding ants. A test tube setup is not ideal given their natural nesting preferences, but could work for a founding colony if provided with moist substrate.

Temperature and Humidity

Maintain temperatures around 22-26°C, which matches their native Madagascar rainforest habitat at 600-1100m elevation. They come from consistently warm, humid conditions. Use a heating cable on one side of the nest to create a gentle gradient so workers can choose their preferred temperature. Humidity should be high, the substrate should feel damp but not waterlogged. Mist occasionally but rely on substrate moisture rather than spraying. Good ventilation is important to prevent mold while maintaining humidity. Avoid placing the nest near direct sunlight or in dry environments. ^[1]

Feeding and Diet

Based on genus patterns, Stigmatomma bolabola is likely predatory on small soil arthropods. Offer live springtails as a primary food source, these are ideal given the ants' tiny size. Other small live prey like micro-arthropods, fruit flies, and pinhead crickets may be accepted. Sugar sources are unlikely to be a significant part of their diet, Amblyoponinae are not typically honeydew feeders. Feed small amounts of prey every few days, removing any uneaten prey to prevent mold. The slow, cryptic hunting behavior typical of this subfamily means prey should be small and easily captured. ^[1]

Colony Development and Growth

This species was only described in 2016,and no colony development data exists in scientific literature ^[1]. Queens have not been described, so founding behavior is unconfirmed. Based on typical Amblyoponinae patterns, expect slow colony growth, these are not fast-growing ants. First workers (nanitics) will likely be smaller than mature workers. Colonies probably remain small, likely under 100 workers at maturity. Be patient, Amblyoponinae colonies develop slowly, and this newly described species will require keeper experimentation to establish optimal care protocols.

Behavior and Temperament

Stigmatomma bolabola is likely a cryptic, slow-moving ant typical of Amblyoponinae. They probably spend most of their time hidden within nest chambers or foraging quietly on the substrate surface. Escape risk is moderate, while not aggressive, their small size means they can slip through small gaps. Standard barrier methods (Fluon on container rims) should prevent escapes. They are unlikely to sting, Amblyoponinae have reduced stingers and are generally docile. Their interesting morphology includes unique features like eight stout spiniform setae on the hypopygium and a fin-like subpetiolar process ^[1]. Observe their behavior carefully and document it, new species observations are valuable to the antkeeping community.

Frequently Asked Questions

References