Stictoponera pertusa

Stictoponera pertusa

Stictoponera pertusa is a small ponerine ant native to Southeast Asia, originally described from Borneo (Sabah) and now confirmed from Sumatra Island ^[1]. Workers measure approximately 4-5mm in total length with a distinctive dark brown body and reddish-brown legs, antennae, and mandibles ^[1]. The species is recognized by its swollen mandibular base, translucent clypeal lamella with broadly convex anterior margin, and a petiole with sharply defined propodeal declivity lateral crests ^[1]. This ant inhabits lowland forest leaf-litter environments, with collection records from elevations near 10m in Borneo and approximately 380m in Sumatra ^[1]. The dealate queen was only recently described in 2024,marking this as one of the most poorly documented species in the Ectatomminae subfamily for antkeepers ^[1].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Southeast Asia, Borneo (Malaysia: Sabah, Sandakan) and Sumatra Island (Indonesia: West Sumatra, Padang) at lowland elevations around 10-380m ^[1]. Inhabits leaf-litter in lowland disturbed forests.
• Colony Type: Colony structure is unconfirmed. Only recently discovered in dealate queen with workers (2024), suggesting colonies exist in small to moderate sizes. No data on queen number.
• Size & Growth:
  • Queen: Queen: HL 0.88mm, HW 0.63mm, WL 1.31mm ^[1]. Estimated 6-7mm total length.
  • Worker: Workers: HL 0.69-0.70mm, HW 0.53-0.55mm, WL 0.95-0.97mm ^[1]. Estimated 4-5mm total length.
  • Colony: Unknown, no colony size data available.
  • Growth: Unknown, no development data exists for this species.
  • Development: Unknown, no development data exists for this species. Estimates based on related Ectatomminae suggest 2-4 months at optimal temperature. (Development timeline is unconfirmed. Related Stictoponera species typically show moderate development rates.)
• Antkeeping:
  • Temperature: Based on lowland tropical habitat (10-380m elevation), keep at 24-28°C. Maintain stable warmth without temperature fluctuations.
  • Humidity: High humidity required, think damp forest floor. Keep substrate consistently moist but not waterlogged. Provide a humidity gradient with a moist nesting area and slightly drier foraging area.
  • Diapause: Unknown, tropical species from lowland habitats may not require formal diapause, but may show reduced activity during cooler periods.
  • Nesting: Natural nesting occurs in leaf-litter and soil. In captivity, a naturalistic setup with moist substrate or a well-humidified acrylic/plaster nest works well. Provide soil-like material for tunneling.
• Behavior: Behavior is undocumented in captivity. Based on genus-level observations of related Ectatomminae, they are likely predatory on small invertebrates and may have a potent sting. Workers are probably active foragers in the leaf-litter layer. Escape prevention should be moderate, workers are small but not tiny enough to require extreme measures like fine mesh. Treat as potentially defensive due to ponerine sting.
• Common Issues: no captive husbandry information exists, this is one of the least-documented species in the hobby, colony founding is completely unstudied, queen behavior during founding is unknown, diet preferences are unconfirmed, related species are predatory but specific prey acceptance is unknown, tropical origin means temperature control is critical, cannot tolerate cool conditions, queen was only described in 2024,meaning wild colonies are rarely available and virtually no captive breeding has been attempted

Species Background and Identification

Stictoponera pertusa was originally described as Stictoponera pertusa by Lattke in 2004 from specimens collected in Borneo, Malaysia (Sabah) ^[1]. The species was recently transferred to Stictoponera following phylogenetic revisions of the Ectatomminae subfamily ^[1]. The name 'pertusa' comes from the Latin word for 'perforated, ' referring to the distinctive foveolate (pitted) sculpturing on the ant's body ^[2].

Workers are small ants approximately 4-5mm in total length with a dark brown body and reddish-brown appendages ^[1]. The most distinctive identification features include the swollen base of the mandible, a translucent clypeal lamella with a broadly convex anterior margin, and a petiole with sharply defined lateral crests marking the propodeal declivity ^[1]. The subpetiolar process is subquadrate with a sharp posterior angle when viewed from the side ^[1].

The dealate queen was only described in 2024,making this one of the most recently documented ant species in the hobby ^[1]. The queen measures approximately 6-7mm and differs from workers in having a shorter mandible with reduced hair, deeper head sculpture, and a more swollen alitrunk ^[1].

Distribution and Natural Habitat

Stictoponera pertusa is known from two main locations in Southeast Asia: Borneo (specifically Sabah, Malaysia near Sandakan at approximately 10m elevation) and Sumatra Island, Indonesia (West Sumatra Province near Padang at approximately 380m elevation) ^[1]. The Sumatra record represents a significant range extension of approximately 1,500km from the known Borneo distribution ^[1].

The species has been collected from leaf-litter in lowland disturbed forest environments ^[1]. The collection data from both locations suggests adaptation to warm, humid tropical conditions typical of Southeast Asian lowland rainforests ^[1]. The Borneo specimens were collected at very low elevation (around 10m above sea level), while the Sumatra record comes from slightly higher elevation (380m), indicating the species can tolerate a range of lowland to lower montane conditions ^[1].

Temperature and Care Requirements

Based on the species' lowland tropical origin (10-380m elevation), you should maintain warm temperatures in the range of 24-28°C ^[1]. This is consistent with other Stictoponera and related Ectatomminae species from Southeast Asian habitats. Temperature stability is important, avoid drafts and significant fluctuations that could stress the colony.

Humidity should be kept high, mimicking the damp conditions of forest floor leaf-litter environments ^[1]. The nesting area should remain consistently moist but not waterlogged, with some slightly drier areas available for the ants to regulate their own humidity preferences. A naturalistic setup with a moisture-retaining substrate works well.

Since this is a tropical species, no formal diapause is required. However, you may observe reduced activity during periods that simulate cooler seasonal conditions. Maintain year-round warmth if possible.

Feeding and Diet

The natural diet of Stictoponera pertusa has not been documented, but based on related Ectatomminae behavior, they are likely predatory on small invertebrates found in leaf-litter ^[2]. In captivity, you should offer small live prey such as fruit flies, small crickets, mealworms, and other appropriately-sized arthropods.

Related species in the genus Stictoponera (formerly Gnamptogenys) are known predators that hunt various small invertebrates. Offer a varied diet of protein sources and observe what the colony accepts. Sugar sources may or may not be accepted, some Ectatomminae species will take honey or sugar water, while others are strictly predatory.

Start with small live prey items and monitor acceptance. Remove uneaten prey after 24-48 hours to prevent mold issues in the humid enclosure this species requires.

Nesting Preferences

In the wild, Stictoponera pertusa has been collected from leaf-litter in lowland forest floors ^[1]. This suggests they nest in soil or decaying organic material at the forest floor level. The dealate queen was found with workers in what appears to be an established colony structure, indicating they form ground-nesting colonies.

For captive housing, a naturalistic setup with moist, soil-like substrate works best. You can also use well-humidified acrylic or plaster nests, but ensure the nesting chambers remain consistently damp. Provide the colony with a foraging area connected to the nest chamber.

Given the small size of workers (approximately 4-5mm), ensure that any formicarium connections and chambers are appropriately scaled. The colony will likely create tunnels and chambers within moist substrate if given the opportunity.

Behavior and Temperament

The behavior of Stictoponera pertusa in captivity has not been documented, as this species has rarely been kept in ant collections. However, you should expect typical ponerine behavior: these ants are likely active foragers that hunt small prey, and they probably possess a functional stinger for defense and subdue prey ^[2].

Ponerine ants are generally more defensive than many Formicinae or Myrmicinae species, so approach with caution during colony maintenance. The sting of related species can be painful, though individual reactions vary.

Workers are small but not extremely so, escape prevention should be adequate with standard barriers. They are not likely to be strong climbers on smooth surfaces, but provide normal precautions to prevent escapes during feeding and cleaning.

Frequently Asked Questions

References