Stenamma catracho

Stenamma catracho

Stenamma catracho is a tiny ant species native to the cloud forests of Honduras and eastern Guatemala. Workers measure just 0.61-0.68mm in head length, making them one of the smaller ant species you'll encounter in the hobby ^[1]. Their body coloration is distinctive, dark red-brown to orange-brown with darker patches on the gaster, and lighter brown to yellow-brown legs and antennae ^[2]. The head and mesosoma are densely sculptured with a wrinkled (rugoreticulate) texture, and they have relatively small eyes with only 4-5 ommatidia. The name 'catracho' refers to the people of Honduras, who often call themselves Catrachos ^[2].

This species is part of the Stenamma Middle American clade and is only known from sifted leaf litter collected at elevations between 1100-1900 meters in montane wet forest habitats ^[1]. Males have never been collected, suggesting their nuptial flight behavior may differ from typical ants or occurs at times/locations not yet documented. As a litter-dwelling species, they prefer the cool, humid microclimates found in decomposing leaves on the forest floor.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Honduras and eastern Guatemala, found in montane wet forest (cloud forest) habitats at 1100-1900m elevation ^[1][2]. Collected from sifted leaf litter on the forest floor.
• Colony Type: Colony structure is unconfirmed. Based on related Stenamma species, likely monogyne (single queen) colonies. No males have been collected to date.
• Size & Growth:
  • Queen: 0.67-0.69mm head length,0.92-1.00mm mesosoma length ^[2]
  • Worker: 0.61-0.68mm head length,0.75-0.82mm mesosoma length ^[1]
  • Colony: Unknown, likely small colonies based on typical Stenamma patterns and their tiny worker size
  • Growth: Unknown, likely slow to moderate given their small size and montane forest origin
  • Development: Estimated 8-12 weeks based on related Stenamma species and tropical montane development patterns (Development is likely slower than lowland tropical species due to cooler native elevations. No direct studies on this species.)
• Antkeeping:
  • Temperature: Keep at 18-22°C, they come from cool montane cloud forests and do not tolerate heat well. Room temperature is often ideal. Avoid any heating as they are adapted to cool, stable conditions ^[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.
  • Diapause: Likely a mild seasonal slowdown during the dry season rather than true hibernation. Based on their tropical montane origin, they probably don't require cold diapause but may reduce activity in cooler months.
  • Nesting: Natural nesting occurs in leaf litter and rotting wood on the forest floor. In captivity, they do well in naturalistic setups with moist substrate, or small acrylic/plaster nests with tight chambers scaled to their tiny size. They need tight spaces, these are litter ants, not open-space foragers.
• 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 rather than exploring widely.
• Common Issues: escape prevention is critical due to their tiny size, use fine mesh and tight-fitting lids, high humidity needs can lead to mold problems if ventilation is poor, slow colony growth can frustrate beginners who expect rapid expansion, they are sensitive to temperature extremes, keep cool, never heat, wild-caught colonies may be stressed from collection and difficult to establish

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/leaf litter mixture, or a custom acrylic nest with chambers sized appropriately for their 0.6mm workers ^[2].

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 Y-tong style nest or 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.

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 1100-1900m 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 don't 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 Stenamma 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's 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 won't 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'll enjoy observing their subtle behaviors rather than handling them.

Frequently Asked Questions

References