Pogonomyrmex striatinodus

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Native to the Northwestern Andean Montane Forest ecoregion in Colombia and Ecuador, at elevations between 1000-1525 meters in mesic (damp) cloud forest habitats ^[1][2][3].
• Colony Type: Unknown – only the worker caste has been described. Based on related species in the sylvestris group, colonies are predicted to be small (several hundred workers maximum) ^[1].
• Size & Growth:
  • Queen: Unknown – queens have never been described ^[1].
  • Worker: Size data unavailable, total length has not been published. Only head and segment measurements exist, which do not represent full body size ^[1].
  • Colony: Estimated at several hundred workers maximum, based on predicted similarity to Pogonomyrmex mayri ^[1].
  • Growth: Unknown – no development data exists.
  • Development: Unknown – no direct measurements exist. Inferred from other Pogonomyrmex species, development might take 6-10 weeks under optimal conditions, but this is speculative. (No specific development data exists for this species.)
• Antkeeping:
  • Temperature: Keep at room temperature (around 20-24°C) as a starting point. This is a high-elevation cloud forest species, so avoid overheating. Monitor colony activity to find the ideal range.
  • Humidity: Moderate to high humidity – these ants come from damp cloud forests. Keep nest substrate consistently moist but not waterlogged, with some drier areas available.
  • Diapause: Unknown – no data on overwintering requirements. Given its high-elevation origin, a mild cool period during seasonal transitions may be appropriate, but this is uncertain.
  • Nesting: No natural nests have ever been documented ^[1]. Based on related species and damp forest habitat, they likely nest in rotting wood or soil in shaded areas. A naturalistic setup with moist substrate (e.g., Y-tong or plaster nest) is appropriate.
• Behavior: No specific behavioral observations exist for this species. Based on related species, they are likely generalist foragers with a diet of dead arthropods, plant parts, and some seeds ^[1]. Escape risk is moderate for a small ant – standard prevention (fluon, tight lids) should suffice. Temperament is unknown, but most Pogonomyrmex can be defensive when disturbed.
• Common Issues: almost no biological data exists – keepers are essentially pioneering care for this species., queens have never been described – you cannot obtain a founding colony from the wild., colony size will likely remain small (few hundred workers), which limits viewing interest., high elevation cloud forest origin means temperature sensitivity – avoid overheating., no hibernation data exists – uncertain how to handle seasonal transitions.

Why This Species Is Challenging

Pogonomyrmex striatinodus is one of the most poorly documented ant species in the hobby. Scientists have never found a queen, never observed nuptial flights, never located a wild nest, and have no data on development times, founding behavior, or colony structure ^[1]. This means you will be essentially pioneering captive care. The biggest challenge is that you cannot obtain a founding colony from the wild since queens have never been described ^[1]. Everything you learn will contribute to scientific knowledge. This is not a species for beginners – you should have experience with other ants and be prepared for uncertainty.

Habitat and Distribution

This species is known only from high-elevation cloud forests of Colombia and Ecuador, specifically in the Northwestern Andean Montane Forest ecoregion at elevations between 1000-1525 meters ^[1][2][3]. This is unusual because most Pogonomyrmex species prefer arid, open habitats ^[4]. Pogonomyrmex striatinodus and its close relative Pogonomyrmex sylvestris are the only Pogonomyrmex known to inhabit damp, shaded forests ^[1]. The type locality is in Nariño, Colombia, at 1200-1400m ^[1]. In Ecuador, it has been collected in Pichincha province at around 1320m ^[5]. These cloud forest conditions mean the ants are adapted to cooler temperatures and higher humidity than typical Pogonomyrmex.

Related Species Biology

Since direct data is unavailable, care must be inferred from related species. AntWiki summarizes Johnson (2015), stating that the biology of Pogonomyrmex striatinodus is predicted to be similar to Pogonomyrmex mayri, which has small colonies (several hundred workers) and a diet of dead arthropods, plant parts, and few seeds ^[1]. This makes sense given the damp forest habitat where seeds are less abundant. The entire sylvestris group is poorly known – most collections are stray foragers, and few nests have been found: one Pogonomyrmex stefani nest had a small exposed entrance, and one Pogonomyrmex sylvestris nest was in a rotten log ^[1]. This suggests Pogonomyrmex striatinodus might nest in rotting wood or moist soil in shaded areas.

Housing and Nesting

No natural nests have ever been documented ^[1]. Based on its damp forest habitat and related species, a naturalistic setup with moist substrate (e.g., soil and rotting wood mix) or a Y-tong/plaster nest with good humidity retention is appropriate. Keep the substrate consistently damp but not waterlogged. Provide a temperature gradient so ants can choose their preferred spot. Since colonies will likely remain small (few hundred workers), a large formicarium is not needed. Standard escape prevention (fluon, tight-fitting lids) is adequate given the small worker size.

Feeding and Diet

Based on predictions from related species ^[1], this species likely has a generalist diet focusing on dead arthropods and plant materials, with seeds being less important than in typical seed-harvesting Pogonomyrmex. Offer protein sources like small insects (fruit flies, small mealworms, crickets) and provide sugar water or honey for energy. As the colony is likely small, avoid overfeeding – give only what they can consume in a couple of days. Remove uneaten food after 24-48 hours to prevent mold.

Temperature and Seasonal Care

This high-elevation cloud forest species should be kept at moderate temperatures around 20-24°C. Avoid overheating, which can be fatal. Watch your colony's behavior: if workers cluster and seem sluggish, it might be too cold, if they avoid the heated areas, it might be too warm. No data exists on diapause requirements ^[1]. Given the mild seasonal variations in the equatorial Andes, a slight temperature reduction during winter months may be appropriate, but this is an educated guess.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References