Trachymyrmex saussurei

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Wet tropical forests in southern Mexico and northern Central America (Belize, Guatemala, Honduras, Costa Rica) ^[1]. Soil-nesting species found on forest floors ^[4].
• Colony Type: Believed to be monogyne (single queen), but colony structure is not extensively documented. All observations come from single-queen collections, suggesting monogyne ^[1].
• Size & Growth:
  • Queen: Body size not documented in literature. Inferred from genus Trachymyrmex: queens approximately 6-8mm total length.
  • Worker: Body size not documented in literature. Inferred from genus Trachymyrmex: workers approximately 3-5mm total length.
  • Colony: Up to several hundred workers (inferred from related Trachymyrmex species)
  • Growth: Moderate
  • Development: Estimated 8-12 weeks (based on related Attini species) (Development is slower than non-fungus-farming ants because the colony must establish a fungal garden before workers can be raised efficiently.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, these are tropical ants requiring warm, stable temperatures ^[1]. Use a heating cable on one side of the nest to create a gentle gradient if room temperature is below 24°C.
  • Humidity: High humidity needed, aim for 70-80% relative humidity. Keep the nest substrate consistently moist but not waterlogged. Fungus gardens require damp conditions to thrive.
  • Diapause: No, being a tropical species, they do not require hibernation. Keep them warm year-round.
  • Nesting: Soil-nesting species, a naturalistic setup with moist substrate (like a mixture of soil and sand) works best ^[4]. Y-tong (AAC) nests can work but require careful humidity management to keep the fungus garden healthy. Avoid completely dry setups.
• Behavior: Generally peaceful and not aggressive. Workers possess a functional stinger (as is typical for Myrmicinae, Attini), but stings are not considered medically significant to humans. They are small ants, so escape risk is moderate, use standard barriers but they aren't major escape artists. Foraging occurs mainly at dawn ^[4]. Workers tend the fungus garden continuously.
• Common Issues: Fungus garden failure is the biggest concern, if the fungal cultivar dies, the colony will not survive. Keep humidity stable and avoid contamination., Overheating is dangerous, temperatures above 32°C can kill the fungus garden. Monitor temperatures carefully., Small colony fragility, founding colonies are extremely vulnerable and can easily fail during the initial establishment phase., Improper diet can kill the fungus, do not feed moldy or contaminated food to the colony.

The Fungus Garden: Their Most Important Feature

Trachymyrmex saussurei, like all Attini ants, cultivates a fungal garden as its primary food source. This species specifically cultivates Leucoagaricus gongylophorus (Clade-A fungus) ^[3][1]. The queen starts the fungal garden during founding, and workers maintain and expand it over time. The fungus produces specialized structures called gongylidia that the ants eat.

In captivity, establishing and maintaining a healthy fungus garden is your primary challenge. The fungal cultivar is sensitive to temperature and humidity extremes, contamination, and improper feeding. Only use clean, organic materials to feed the fungus, avoid anything moldy or chemically treated. Never feed the ants directly, they feed the fungus, and the fungus feeds them.

Feeding and Diet

Unlike leaf-cutter ants that cut fresh leaves to feed their fungus, Trachymyrmex species typically feed their fungus garden with organic debris, seeds, and other plant materials ^[4][1]. In captivity, you can offer small pieces of organic matter like dried leaves, flower petals, seed husks, or small amounts of grains/rice. Some colonies may accept small amounts of fruit or vegetable matter.

The key principle is: you're not feeding the ants directly, you're feeding the fungus. Offer small amounts of clean, organic material and remove any uneaten portions before they mold. The amount depends on the colony size, a small starting garden needs very little. Remove any mold immediately as it can kill the fungal cultivar.

Temperature and Care

As a tropical species from wet forests in Mexico and Central America, Trachymyrmex saussurei requires warm, stable conditions ^[1]. Keep the nest area at 24-28°C. Temperatures below 20°C or above 32°C can stress the colony and damage the fungus garden. Use a heating cable on one side of the nest to create a temperature gradient if needed, but always provide a cooler area the ants can access.

Humidity is equally critical, aim for 70-80% relative humidity inside the nest. The substrate should feel consistently moist but never waterlogged. Use a water reservoir or mist regularly to maintain humidity. A hygrometer helps monitor conditions. Poor humidity causes the fungus garden to dry out and die.

Housing and Nest Setup

These are soil-nesting ants, so a naturalistic setup with a moist substrate mixture (like potting soil, sand, and peat moss) works best ^[4]. The substrate should be deep enough to allow the ants to dig chambers for their fungus garden. You can also use a Y-tong (AAC) nest, but you'll need to carefully manage humidity and provide a small chamber or dish for the fungus garden.

Whatever setup you choose, ensure good ventilation to prevent mold while maintaining humidity. Avoid glass or acrylic nests that can trap too much moisture. Provide an outworld (foraging area) where you can place food for the fungus garden. Escape prevention is important but not extreme, these are moderately small ants, so standard barriers work well.

Behavior and Colony Life

Trachymyrmex saussurei workers are small, monomorphic, and generally peaceful ^[4]. They have a functional stinger (typical for Myrmicinae), but it's not medically significant to humans. Workers tend their fungus garden continuously, adding new organic material and harvesting gongylidia. Foraging is most active at dawn ^[4].

Colony growth is slower than many common ant species because resources go into maintaining and expanding the fungal garden rather than producing workers rapidly. A mature colony may reach several hundred workers over several years. The queen can live for many years, as is typical for Attini ants.

Frequently Asked Questions

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References