Stenamma catracho

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Honduras and eastern Guatemala, found in montane wet forest (cloud forest) habitats at 1100-1900 m elevation ^[1][3]. Collected from sifted leaf litter on the forest floor.
• Colony Type: Colony structure is unconfirmed. No males have been collected, making it difficult to determine queen number. Likely monogyne (single queen) based on related Stenamma species, but this is speculative.
• Size & Growth:
  • Queen: Total body length not documented. Head length ~0.67-0.69 mm, thorax length ~0.92-1.00 mm ^[3].
  • Worker: Total body length not documented. Head length ~0.61-0.68 mm, thorax length ~0.75-0.82 mm ^[1].
  • Colony: Unknown, no colony size data exists for this species. Typical Stenamma colonies are small (under 500 workers), but this is unconfirmed for S. catracho.
  • Growth: Unknown, no data available. Likely slow to moderate given their small size and montane origin.
  • Development: Unknown, no specific data exists for this species. Any estimates would be speculation. (Development times are likely slower than lowland tropical species due to cool native elevations.)
• Antkeeping:
  • Temperature: Keep them cool, 18-22°C is ideal. They come from montane cloud forests with stable, mild temperatures. Never use heating cables or heat mats. Room temperature is often perfect. Avoid sudden temperature swings ^[1].
  • Humidity: High humidity required, think damp forest floor. Keep the nest substrate consistently moist but not waterlogged. Provide a humidity gradient so ants can choose their preferred zone. Montane cloud forests are constantly humid ^[1].
  • Diapause: Unknown, as a tropical montane species, true cold diapause is unlikely. A mild seasonal slowdown may occur during dry months, but this is not confirmed.
  • Nesting: Natural nesting occurs in leaf litter and rotting wood on the forest floor. In captivity, use small, tight spaces like plaster nests, Y-tong (AAC) blocks, or naturalistic setups with moist soil and leaf litter. Avoid large, open formicaria, they prefer cramped chambers scaled to their tiny size.
• Behavior: Generally peaceful and non-aggressive. As tiny litter-dwelling ants, they are not defensive and rarely sting. Workers forage individually through leaf litter and soil, searching for small prey and honeydew. Their small size means excellent escape prevention is essential, they can squeeze through remarkably small gaps. They are slow-moving and secretive, preferring to stay within the nest and foraging areas. Males have never been collected, so their reproductive behavior is unknown ^[2].
• Common Issues: escape prevention is critical due to tiny size, use fine mesh and tight-fitting lids., high humidity needs can lead to mold problems if ventilation is poor., slow or unknown colony growth can be frustrating for keepers expecting rapid expansion., sensitive to temperature extremes, keep cool, never heat., wild-caught colonies may be stressed from collection, founding success is uncertain.

Housing and Nest Setup

Stenamma catracho is a litter-dwelling species that thrives in small, humid spaces. For founding colonies, a test tube setup works well, just ensure the cotton is packed tightly since these tiny ants can squeeze through gaps that would stop larger species. As colonies grow, consider a small naturalistic setup with a layer of moist soil and leaf litter mixture, or a custom plaster or Y-tong nest with chambers sized appropriately for their tiny workers ^[3].The key is scale, their chambers should be tight, not spacious. These ants feel secure in compact spaces and may struggle in large, open formicaria. A small plaster nest with narrow galleries works better than expansive setups. Always provide a water tube and keep the nest area humidified. Cover the nest partially to create darker, more secure conditions that mimic their leaf litter environment. Avoid acrylic nests, they are inappropriate for species that need high humidity and tight spaces.

Feeding and Diet

In the wild, Stenamma species are generalist foragers that hunt small prey and collect honeydew from aphids and scale insects. For your colony, offer small protein sources like fruit flies, pinhead crickets, or tiny mealworms, prey should be no larger than the ants themselves. Since they have small mandibles and are tiny, they cannot tackle large prey items.For sugar, offer a drop of sugar water or honey diluted with water, placed on a tiny piece of cotton or sponge. They will also tend aphids if you have any on plants in the outworld. Feed small amounts 2-3 times per week, removing any uneaten prey after 24 hours to prevent mold. Because they are small and secretive, they may not consume food immediately, be patient and check the next day.

Temperature and Seasonal Care

This is one of the most important aspects of keeping S. catracho successfully. They come from montane cloud forests at 1100-1900 m elevation in Honduras and Guatemala, this means they are adapted to cool, stable temperatures ^[1]. Unlike most ants kept in captivity, they do not want warmth.Keep them at room temperature or slightly below, aim for 18-22°C. Never use heating cables or heat mats on their nest. If your room runs warm in summer, this species may struggle. In winter, they may naturally slow down slightly, which is fine, just do not cool them dramatically. The key is consistency: avoid temperature swings and keep them away from windows, air vents, and electronics that generate heat.

Humidity Management

Montane cloud forests are constantly humid environments, so your S. catracho colony needs high humidity to thrive. Keep the nest substrate consistently moist, it should feel damp to the touch but never have standing water. A water tube connected to the nest helps maintain humidity through evaporation.However, balance is key: too little humidity and the colony will desiccate, too much with poor ventilation leads to mold that can kill the colony. Use adequate ventilation holes that allow air flow without drying the nest. If you see condensation constantly dripping inside the nest, that is too wet, open up more ventilation. If the substrate dries quickly between refills, you may need to add more water or reduce ventilation. ^[1]

Behavior and Observation

These are not flashy ants, they are subtle, secretive, and fascinating to watch in their quiet way. Workers forage individually rather than in trails, picking through the substrate searching for tiny prey. They are not aggressive and will flee rather than fight when disturbed. You likely will not see dramatic territorial behavior or large-scale foraging expeditions.Because they are small and dark-colored, they can be hard to see against some substrates. Use a light-colored outworld background to make them more visible for observation. Their small size and quiet nature make them a 'watching' species rather than an 'interacting' species, you will enjoy observing their subtle behaviors rather than handling them. No males have ever been collected, so the full picture of their social behavior remains unknown ^[2].

Frequently Asked Questions

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References