Mycetomoellerius echinus

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Bolivia in the Neotropical region. They inhabit tropical forest environments where they nest in soil or rotting wood and cultivate their fungal gardens in the humid understory ^[1][2].
• Colony Type: Colony structure is unconfirmed for this species.
• Size & Growth:
  • Queen: size data unavailable, inferred from related Mycetomoellerius species as approximately 5-7mm
  • Worker: size data unavailable, inferred from genus patterns as approximately 3-4mm
  • Colony: Likely up to several hundred workers based on typical Attini colony sizes
  • Growth: Moderate, fungus-farming ants grow steadily but not rapidly
  • Development: Estimated 6-10 weeks at optimal temperature based on related Attini species (Development time is inferred from genus-level data since specific timing for M. echinus has not been documented)
• Antkeeping:
  • Temperature: Keep at 24-28°C. These are Neotropical ants that need warmth, similar to other Attini species, they thrive in warm, humid conditions. A heating cable on one side of the nest creates a suitable gradient.
  • Humidity: High humidity is essential, aim for 70-85%. The fungal garden needs consistent moisture. Use moist substrate in test tubes or nests with moisture chambers, and maintain humidity without letting the nest become waterlogged. The substrate should feel damp but not soggy.
  • Diapause: Unlikely required, as tropical ants from Bolivia, they probably do not need a true hibernation. They may slow down slightly during cooler months but should be kept warm year-round.
  • Nesting: Test tube setups work well for founding colonies. For established colonies, nests with moisture chambers maintain the humidity they need. They prefer enclosed, humid spaces similar to their natural nesting in rotting wood or soil cavities.
• Behavior: Generally peaceful and non-aggressive. Like other Attini, they are not known for stinging and pose no danger to keepers. They are active foragers that collect plant material to feed their fungus. Escape risk is moderate, their small size means they can slip through small gaps, so standard barrier precautions apply.
• Common Issues: fungal garden collapse is the biggest risk, sudden temperature or humidity changes can kill the fungus the colony depends on, overfeeding can cause mold problems in the nest, remove uneaten plant material promptly, tiny size means escapes are possible without proper barriers, poor ventilation can cause mold growth that harms both ants and fungus, cold temperatures will slow or stop fungus growth, which stops colony growth

Fungus Farming Basics

Mycetomoellerius echinus belongs to the tribe Attini, a group of ants that have evolved an obligate mutualism with fungi. The ants do not eat the plant material they collect directly, instead, they feed it to their fungal cultivar, which breaks down the material and produces specialized structures the ants eat. This means your colony needs two things: a healthy fungal garden and fresh plant material to feed it. The fungus forms a white, cotton-like mass in the nest that the ants tend constantly. Without the fungus, the colony cannot survive. This is fundamentally different from keeping predatory or omnivorous ants, where you focus on feeding the ants directly. ^[2]

Feeding Your Colony

Feed your ants small pieces of plant material, dried leaves, flower petals, small seeds, or grain fragments work well. The ants will cut these into smaller pieces and incorporate them into their fungal garden. Offer fresh material every few days and remove anything that becomes moldy. Do not offer protein-rich foods like insects, Attini fungi are specialized to break down plant material, not animal protein. Some keepers also offer a small amount of honey or sugar water occasionally, but plant material should be the primary food source. The amount to feed depends on the size of your colony and fungal garden, start with small amounts and adjust based on how quickly the material gets incorporated.

Temperature and Humidity

These ants need warm, humid conditions year-round. Keep the nest at 24-28°C, this range supports both the ants and their fungal cultivar. Temperatures below 22°C can slow fungal growth, which slows colony development. Use a heating cable or small heat mat on one side of the nest to create a temperature gradient, allowing the ants to choose their preferred spot. Humidity should stay around 70-85%. The fungal garden needs consistent moisture, dry conditions will kill it. Use test tubes with water reservoirs or moisture-retentive nest materials. Check regularly that the substrate hasn't dried out, but avoid having standing water in the nest.

Colony Establishment

A newly mated queen will found her colony alone, sealing herself in a small chamber with a bit of plant material. She tends a small fungal pellet that will become the colony's garden. The claustral queen uses stored fat reserves to survive until her first workers emerge, typically after 4-8 weeks. The first workers (nanitics) are smaller than mature workers and will begin foraging for plant material to expand the fungal garden. During this founding phase, keep the setup warm and humid, and do not disturb the queen unnecessarily. Once workers are established, you can begin offering slightly larger amounts of plant material.

Nest Setup

Test tubes work well for founding colonies, fill one end with water, plug with cotton, and place the queen in the dry portion. For established colonies, nests with moisture chambers maintain the humidity these ants need. The nest chambers should be appropriately sized for their small workers, avoid overly large, open spaces. Provide an outworld area where you can offer plant material. Escape prevention is important given their small size, use fluon on nest edges and ensure any connections between areas are secure. A small water source in the outworld helps with hydration.

Frequently Asked Questions

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References