Stegomyrmex olindae

Stegomyrmex olindae

Stegomyrmex olindae is a small Neotropical ant native to central-north Brazil and French Guiana. Workers measure 5.0-5.7mm in total length with a dark brown to reddish-ferruginous body and noticeably lighter appendages ^[1]. Their most distinctive feature is the dense covering of long, slightly stiffened hairs across their body, giving them a somewhat fuzzy appearance. The mesosoma (the middle body section) is heavily sculpted with deep areolate-rugose texture, and they possess short propodeal spines ^[1]. Queens are larger at 6.5mm total length ^[1]. This species belongs to the Solenopsidini tribe within Myrmicinae, which includes fire ants and other predatory small ants.

This ant remains one of the most enigmatic species in the ant-keeping hobby. Found exclusively in the leaf litter of mature wet forests across central-north Brazil and into French Guiana, it nests approximately 50cm deep in the soil ^[2][1]. Despite being described in 2008,absolutely no published information exists on its natural history, including founding behavior, colony size, diet, or queen number. This makes it an expert-level species for dedicated antkeepers who enjoy observing and learning from a truly undocumented species.

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Central-north Brazil (Bahia, Maranhão, Minas Gerais, Mato Grosso, Tocantins) and French Guiana. Found in leaf litter of mature wet forests at elevations ranging from sea level to highland areas ^[1][3][4].
• Colony Type: Unknown, colony structure has not been documented in scientific literature
• Size & Growth:
  • Queen: 6.50-6.51mm total length, HW 1.24-1.26mm ^[1]
  • Worker: 5.01-5.70mm total length, HW 1.04-1.22mm ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data exists for this species
  • Development: Unknown, no direct measurements available. Based on typical Solenopsidini patterns and tropical conditions, estimate 4-8 weeks at optimal temperature, but this is a rough guess. (Development timeline is completely unstudied. Estimates based on related genera may not apply.)
• Antkeeping:
  • Temperature: Inferred: Keep at 24-28°C based on its wet forest habitat in tropical Brazil. Avoid temperatures below 22°C. Provide a gentle thermal gradient if possible.
  • Humidity: High humidity required, this is a leaf-litter ant from wet forests. Keep nest substrate consistently moist but not waterlogged. Aim for 70-85% humidity in the nest area.
  • Diapause: Unknown, tropical species may not require true diapause, but some seasonal slowdowns may occur. Monitor colony activity patterns.
  • Nesting: Nests at approximately 50cm depth in soil in the wild ^[2]. In captivity, provide deep substrate (at least 10-15cm) in a naturalistic setup or a deep acrylic/plaster formicarium. Y-tong nests may be too shallow unless modified. Keep nest dark and humid.
• Behavior: No specific behavioral studies exist. Based on tribe membership (Solenopsidini), they likely have a functional stinger and may show moderate aggression when disturbed. Workers are ground-nesting and forager in leaf litter. Escape risk is moderate given their 5mm size, standard barrier precautions recommended.
• Common Issues: No available care information means you're essentially pioneering husbandry, expect a learning curve and potential colony losses while establishing what works., As a deep-nesting species, they need vertical space that most standard formicariums don't provide, custom or modified setups may be necessary., Wild-caught colonies may harbor parasites or pathogens not present in captive-bred stock, quarantine and careful observation essential., Their cryptic lifestyle in leaf litter means they're not particularly active or visible compared to more charismatic species., Temperature and humidity requirements are inferred, not confirmed, be prepared to adjust conditions based on colony response.

Housing and Nesting

Stegomyrmex olindae presents a unique housing challenge because they naturally nest about 50cm deep in the soil ^[2]. Most commercial formicariums won't accommodate this depth requirement. A naturalistic setup with a deep soil chamber (at least 10-15cm of moist substrate) works best. You can use a large plastic container or custom-built naturalistic formicarium filled with a soil mixture that holds moisture well. Alternatively, modify an acrylic nest by adding a deeper chamber or stacking multiple levels connected by tubing. Test tubes are generally too shallow for established colonies but work for temporary housing during founding. The nest should remain dark and humid, these are cryptic leaf-litter ants that avoid light. Provide a humid outworld where workers can forage, and cover the nest area to block light. Escape prevention is straightforward given their moderate 5mm size, standard barriers like fluon on container rims work adequately ^[1].

Feeding and Diet

No specific dietary studies exist for S. olindae, but as a member of the Solenopsidini tribe (which includes fire ants and other predatory ants), they likely occupy a predatory or omnivorous niche. In the wild, they probably hunt small invertebrates in the leaf litter layer, similar to other Neotropical Solenopsidini. Offer a varied diet: small live prey like fruit flies, pinhead crickets, and tiny arthropods (springtails work well for their size). They should also accept protein-based foods like boiled egg, chicken, or commercial ant gels. Sugar sources like honey water or sugar water may be accepted, though this is unconfirmed. Feed small amounts initially and remove uneaten food within 24-48 hours to prevent mold. Given their unknown acceptance of various foods, be prepared to experiment, some colonies take readily to certain foods while ignoring others. The key is offering diversity and observing what they prefer ^[1][3].

Temperature and Care

This species comes from wet tropical forests in central-north Brazil, so warm and humid conditions are essential. Keep the nest area at 24-28°C, this matches their natural range in the Brazilian Amazon and Cerrado regions. A heating cable on one side of the nest creates a temperature gradient, allowing ants to self-regulate. Avoid temperatures below 22°C or above 32°C. Humidity is critical: maintain 70-85% relative humidity in the nest, with consistently moist (but not waterlogged) substrate. Mist the outworld occasionally, but focus on maintaining substrate moisture rather than air humidity alone. Since nothing is known about their seasonal requirements, observe your colony for any annual activity changes, tropical ants often show subtle seasonal shifts rather than true hibernation. If the colony becomes less active in winter months, reduce feeding frequency but maintain temperature and humidity ^[1][2].

Colony Establishment

Establishing a colony of S. olindae presents significant challenges because nothing is known about their founding behavior. Based on typical Solenopsidini patterns, the queen likely seals herself in a claustral chamber and rears the first brood on stored fat reserves, but this is unconfirmed. If you obtain a founding queen, house her in a test tube with a water reservoir (standard founding setup) or a small soil chamber. Keep her in complete darkness at 26°C with high humidity. Do not disturb her during the founding period, this can cause her to abandon or eat her brood. Once workers emerge (if they do), wait several weeks before offering food, then provide tiny prey items. Growth will likely be slow given the lack of documented development times. Be patient, many exotic species take months or even years to establish stable colonies. Consider joining antkeeping communities to share experiences with others attempting to keep this species ^[1].

Frequently Asked Questions

References