Stigmatomma rothneyi

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Native to India's Western Ghats and Eastern Himalayas, with additional older records from southern China and the Philippines ^[1][8]. They inhabit leaf litter in forests, often at higher elevations ^[6].
• Colony Type: Unconfirmed, likely monogyne (single queen) based on typical Amblyoponinae patterns, but no direct data supports this.
• Size & Growth:
  • Queen: Size data unavailable, no total body length reported in literature.
  • Worker: Size data unavailable, no total body length reported in literature.
  • Colony: Unknown, likely small, but no records of mature colony size exist.
  • Growth: Unknown, not documented for this species, possibly moderate based on genus patterns.
  • Development: Not documented for this species. (Development time is unknown, estimates from related species are not reliable.)
• Antkeeping:
  • Temperature: Not explicitly documented. Based on their subtropical highland habitat, aim for moderate temperatures around 22-26°C with a slight gradient. Avoid extremes.
  • Humidity: High, maintain consistent moisture in the nest substrate, mirroring their leaf-litter environment. Keep the substrate damp but not waterlogged.
  • Diapause: Unknown, a mild winter cooling may be beneficial given the Himalayan part of their range, but it is not confirmed. Do not force diapause without evidence.
  • Nesting: Prefer dark, humid conditions. Use plaster, Y-tong (AAC), or soil-based nests. Avoid acrylic nests. The nest should be kept dark and provide a moisture gradient.
• Behavior: Cryptic and ground-dwelling, workers stay hidden most of the time. They are not aggressive toward keepers but have a functional stinger (subfamily trait). Their unique feeding behavior involves wounding larvae and feeding on hemolymph, this is normal. Workers are small, so escape prevention is critical, seal all gaps narrower than 1 mm. They are slow-moving and not particularly active.
• Common Issues: colonies are rare and difficult to acquire, limited availability from suppliers., unique hemolymph-feeding behavior requires understanding, normal ant diets may not suffice., escape prevention is critical due to small worker size., slow and uncertain growth can lead to overfeeding or unnecessary disturbance., they prefer dark conditions, excessive light causes stress.

Housing and Nest Setup

Stigmatomma rothneyi does best in a naturalistic or semi-naturalistic setup that mimics leaf-litter conditions. Use a plaster, Y-tong (AAC), or soil-based nest, avoid acrylic. The nest must stay consistently damp but not waterlogged. Provide a dark environment, cover the nest or place it in a dim area. Because the workers are small, your formicarium should have no gap larger than 1 mm to prevent escapes. A test tube setup can work for founding, but move the colony to a larger nest once a small number of workers have emerged (exact number not documented). ^[6][3]

Feeding and Diet

Feeding is the most critical aspect for this species. Stigmatomma rothneyi is a dracula ant, workers wound the brood (especially larvae) and feed on the hemolymph that oozes out ^[5]. In captivity, provide small live prey like springtails, fruit flies, and tiny crickets. The prey does not need to be killed first. Some colonies may also accept small amounts of honey or sugar water, but protein from live prey is essential. Do not remove dead larvae immediately, the hemolymph feeding is how workers obtain nutrition. Feed small amounts 2-3 times per week, adjusting based on consumption.

Temperature and Seasonal Care

Stable temperatures around 22-26°C are recommended, based on their subtropical highland origin ^[8]. Offer a temperature gradient (e.g., warm end ~24°C, cool end ~22°C) so the ants can choose. Seasonal cooling may be beneficial but is not confirmed. If you attempt diapause, reduce temperatures gradually to 15-18°C for 2-3 months in winter, but observe colony health closely. Avoid sudden changes.

Behavior and Temperament

Workers are cryptic, they spend most of their time hidden and are rarely seen foraging in the open. They are not aggressive and will retreat rather than attack, but they do have a functional stinger (typical of Amblyoponinae). The most unusual behavior is hemolymph feeding, workers move over larvae and show what looks like wounding. This is normal, not brood abuse. Workers are relatively slow-moving. They are not escape artists by nature, but due to their small size, ensure all openings are sealed with fine mesh and check connections regularly. ^[5][2]

Colony Establishment and Growth

Starting a colony is challenging because Stigmatomma rothneyi is rare and difficult to obtain ^[2]. Founding behavior is unconfirmed, it is not known whether queens found claustrally or semi-claustrally. If you obtain a queen, house her in a dark, stable test tube and wait. The first workers (nanitics) will be smaller than mature workers. Growth rate and timeline are undocumented. Be patient, do not overfeed or disturb the colony during founding. Maximum colony size is unknown, but based on other Amblyoponinae it is likely small.

Frequently Asked Questions

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References