Stenamma manni

Stenamma manni

Stenamma manni is one of the largest and most conspicuous species in the Stenamma genus, native to the cloud forests and oak woodlands of Mexico and Central America. Workers are medium to large ants, ranging from 0.70-1.01mm in head width, with a distinctive 4-segmented antennal club and short, tuberculate propodeal spines ^[1]. Their body color is highly variable, ranging from nearly black to red-brown, brown, or even yellow-brown depending on the population ^[1]. This species is commonly found at the edge of cloud forests, nesting in logs and under rocks in damp locations. Colonies are very large, with hundreds to perhaps over a thousand workers living in multi-chambered nests ^[1]. They are active ground foragers, searching for food alone rather than in groups ^[1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Mexico to Nicaragua, at elevations of 1200-3700m (most common 2000-2500m). Found in wet montane cloud forests and drier oak woodland habitats ^[1][2]. Nests in logs, leaf litter, under rocks, and in the ground.
• Colony Type: Monogyne, colonies have a single egg-laying queen. Very large colonies with hundreds to over a thousand workers ^[1].
  • Colony: Monogyne
• Size & Growth:
  • Queen: 9.2-11.3mm head length (queens are significantly larger than workers) ^[1]
  • Worker: 0.81-1.13mm head length,1.05-1.50mm mesosoma length ^[1]
  • Colony: Hundreds to perhaps over a thousand workers ^[1]
  • Growth: Moderate, inferred from large colony sizes and complex social structure
  • Development: Estimated 6-10 weeks based on typical Myrmicinae development patterns (Development time likely influenced by temperature, being a high-elevation species, they may develop slower than tropical ants)
• Antkeeping:
  • Temperature: Keep around 18-22°C, this is a high-elevation cloud forest species that prefers cooler temperatures than typical tropical ants. Avoid overheating.
  • Humidity: High humidity is essential. These ants come from damp cloud forest environments. Keep the nest substrate consistently moist but not waterlogged, with some drier areas for the ants to choose.
  • Diapause: Likely requires a cool period during winter months, reflecting their high-elevation habitat. Reduce temperature to around 15°C for 2-3 months.
  • Nesting: Prefers naturalistic setups with multiple chambers. Y-tong (AAC) nests or plaster nests work well. They nest under logs and rocks in the wild, so provide a setup that allows for multiple connected chambers. Keep substrate damp.
• Behavior: These ants are active ground foragers that search for food individually (solitary foraging) ^[1]. They are not aggressive and typically flee when disturbed. Workers are moderate in size, making escape prevention straightforward, standard barriers like fluon on test tube rims work well. They are epigeic (ground-active) and will readily explore the outworld for food. They accept a variety of foods including small insects and sugar sources.
• Common Issues: high humidity requirements can lead to mold problems if ventilation is poor, colonies are very large when mature, ensure you have space for a substantial colony, being a cryptic species, they may be shy and less active than more common ants, temperature sensitivity, they prefer cooler conditions and can overheat easily, wild-caught colonies may be difficult to establish due to their specific habitat requirements

Housing and Nest Setup

Stenamma manni does well in naturalistic or Y-tong (AAC) setups that can accommodate their large colony sizes. In the wild, they nest in logs, under rocks, and in the ground, typically in damp locations ^[1]. For captivity, use a setup with multiple connected chambers that allows the colony to spread out as it grows. Plaster nests also work well since they hold moisture effectively. The outworld should be spacious enough for foragers to search for food, as these ants are active ground foragers. Ensure excellent escape prevention, while not tiny, they are agile and will explore any gaps. Use fluon on tube rims and check connections between nest modules regularly.

Feeding and Diet

These ants are generalist foragers that will accept a variety of foods. In the wild, they forage singly on the ground surface and are commonly attracted to bait cards, suggesting they scavenge and hunt small prey ^[1]. Offer small live insects like fruit flies, pinhead crickets, or mealworms as protein sources. They also accept sugar water, honey, or diluted syrup. Feed protein 2-3 times per week and keep a sugar source available constantly. Remove uneaten food promptly to prevent mold in the humid environment they require.

Temperature and Seasonal Care

As a high-elevation cloud forest species from Mexico and Central America, Stenamma manni prefers cooler temperatures than most tropical ants. Keep the nest area around 18-22°C. They can tolerate brief periods slightly outside this range but avoid overheating, temperatures above 25°C may stress them. During winter, simulate their natural seasonal cycle by reducing temperatures to around 15°C for 2-3 months. This cool period reflects their mountain habitat origins and supports healthy colony cycles. Use a heating cable only on one side of the nest if needed to create a slight gradient, and never place it directly on the nest material. ^[1][2]

Humidity and Water Requirements

High humidity is critical for this species. They originate from damp cloud forest environments where moisture is abundant ^[2]. Keep the nest substrate consistently moist but not waterlogged, the substrate should feel damp to the touch. Provide a water tube or small dish in the outworld. In naturalistic setups, mist occasionally but monitor for standing water. Good ventilation is important to prevent mold while maintaining humidity, aim for damp air without stagnant conditions. The ants will naturally move between wetter and drier areas within the nest to self-regulate.

Colony Development and Growth

Stenamma manni colonies can grow very large, hundreds to over a thousand workers in established colonies ^[1]. The queen is significantly larger than workers (head length 0.92-1.13mm vs 0.81-1.13mm), which is typical for claustral founding. Development from egg to worker likely takes 6-10 weeks at optimal temperatures, similar to other Myrmicinae. Growth is moderate, not as fast as some tropical species but steady under good conditions. First workers (nanitics) will be smaller than mature workers. As the colony grows, new chambers or nest modules may be needed to accommodate the expanding population.

Frequently Asked Questions

References