Myrmelachista gallicola

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Neotropical region: Argentina (Buenos Aires, Misiones, La Pampa), Uruguay (Soriano, Mercedes), and Brazil (Rio Grande do Sul, Rio de Janeiro). Inhabits Atlantic Forest, subtropical grasslands, restinga coastal areas, and Cerrado. Nests in arboreal cavities including plant galls, dead twigs, and tree hollows ^[1][2][3][4].
• Colony Type: Polygynous colonies with 1-2 queens (mean 1.4 ± 0.55). Polydomy observed, multiple nests can exist in a single plant, each with its own queen ^[5][6].
• Size & Growth:
  • Queen: 4.27 mm ^[5]
  • Worker: 1.7-2.5 mm ^[1][2]
  • Colony: up to 114 workers ^[5]
  • Growth: Moderate
  • Development: Unknown, no development studies for this species (Development timeline unconfirmed for this species.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. As a subtropical species, they prefer warm conditions. A gentle temperature gradient allows them to regulate. Room temperature within this range works well, otherwise use a heating cable on one side of the nest.
  • Humidity: Moderate to high. As an arboreal species nesting in tree cavities and plant galls, they prefer humid conditions. Keep nest substrate lightly moist but not waterlogged. Mist occasionally and provide a water tube.
  • Diapause: No, as a subtropical species from southern Brazil, Uruguay, and Argentina, they do not require true hibernation. Maintain stable temperatures year-round ^[7].
  • Nesting: Arboreal setup works best. These ants naturally nest in hollow twigs, plant galls, and tree cavities. In captivity, use Y-tong (AAC), plaster, soil nests, or 3D-printed nests with small narrow chambers. Avoid large, open spaces, they prefer tight, enclosed spaces.
• Behavior: Extremely timid and non-aggressive. When threatened, they quickly retreat into nest openings rather than defending. This makes them a peaceful colony to observe but also means they're easily stressed by excessive disturbance. They are arboreal foragers, feeding on extrafloral nectaries and small insects. Escape prevention is important due to their very small size, use fine mesh barriers. They form mutual associations with scale insects (Coccidae and Pseudococcidae) for honeydew ^[8].
• Common Issues: very small size means escapes are likely without fine mesh barriers, timid behavior may lead to stress if colony is frequently disturbed, arboreal nesting means standard soil-based nests may not be ideal, polygynous structure means multiple queens are normal, do not separate them, limited captive breeding information makes care experimental

Nest Preferences and Housing

Myrmelachista gallicola is an obligate arboreal nester. In the wild, they colonize hollow twigs, plant galls (especially those produced by Tetradiplosis sp. and Eschatocerus acaciae), and cavities in small dead trees. They've been found nesting in Schinus terebinthifolius (Brazilian peppertree) and Prosopis caldenia. A single plant can support multiple nests (polydomy), with each nest containing its own queen ^[6][1][2][8]. For captive care, mimic their natural nesting sites using Y-tong (AAC), plaster, soil nests, or 3D-printed nests with narrow chambers and passages. Twig-style nests or setups with pre-drilled small cavities work well. Avoid large, open spaces, these ants prefer tight, enclosed areas. Provide multiple connected chambers to accommodate their polygynous colony structure.

Feeding and Diet

Like other Myrmelachista species, M. gallicola feeds on extrafloral nectaries and animal-derived proteins. In captivity, offer a varied diet including sugar water or honey as an energy source, and small protein sources like fruit flies, small mealworms, or other tiny insects. They form mutualistic associations with scale insects (Coccidae and Pseudococcidae) in the wild, so they may tend aphids or scale insects if provided in the outworld ^[8]. Feed small amounts of protein 2-3 times per week, and keep a constant sugar water source available. Remove uneaten food promptly to prevent mold.

Temperature and Seasonal Care

As a subtropical species from southern Brazil, Uruguay, and Argentina, Myrmelachista gallicola prefers warm, stable temperatures in the range of 22-26°C. They are found in Atlantic Forest and grassland habitats where temperatures are moderate year-round. Provide a gentle temperature gradient using a heating cable on one side of the nest if room temperature falls below this range. True hibernation is unlikely given their subtropical distribution, maintain stable temperatures throughout the year. Winged reproductives have been observed in November-December, suggesting nuptial flights occur during the southern hemisphere summer ^[7].

Colony Structure and Behavior

This species is polygynous, with colonies typically containing 1-2 queens (mean 1.4 ± 0.55). Unlike many ants, they naturally form polydomous colonies, multiple nests within a single plant, each with its own queen ^[6][5]. Workers are extremely timid and non-aggressive, when disturbed, they quickly retreat into nest openings rather than defending ^[6][8]. This peaceful temperament makes them interesting to observe but also means they're sensitive to vibration and disturbance. Colony sizes in the wild reach up to 114 workers, with averages around 85 workers per colony ^[5]. The species is considered cryptic and arboreal, nesting in vegetation rather than on the ground ^[4][9].

Escape Prevention

With workers measuring only 1.7-2.5mm, Myrmelachista gallicola is prone to escaping through tiny gaps. Use excellent escape prevention including fine mesh barriers (at least 0.5mm mesh), tight-fitting lids on any outworld containers, and reliable barrier methods like Fluon on test tube rims. Check connections between nest components regularly as these tiny ants can squeeze through remarkably small spaces. Their timid nature actually helps with containment, they're more likely to hide than to actively explore escape routes, but you should still assume they will find any gap available. ^[1][2]

Frequently Asked Questions

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References