Myrmecocystus melanoticus

Quick Summary

• Difficulty: Medium to Hard
• Origin & Habitat: Central Mexico (Hidalgo and Puebla states) at 6700-8600 feet elevation. Inhabits arid hilltops with maguey plantings, arborescent Yucca and Acacia vegetation ^[1][2].
• Colony Type: Colony structure is unconfirmed. Based on related Myrmecocystus patterns, likely single-queen colonies with potential for replete formation for food storage.
• Size & Growth:
  • Queen: size data unavailable
  • Worker: size data unavailable
  • Colony: Unknown, related species typically reach several hundred workers ^[2]
  • Growth: Unknown, likely moderate based on genus patterns
  • Development: Unknown, no direct data available (Estimates based on genus-level patterns for similar arid-region honey ants.)
• Antkeeping:
  • Temperature: Aim for 20-26°C, these are arid-region ants from elevated Mexican habitats. Provide a temperature gradient allowing workers to self-regulate ^[2].
  • Humidity: Low to moderate, these ants come from arid hilltop habitats. Keep nest substrate relatively dry, with a small water tube for humidity. Avoid damp conditions ^[2].
  • Diapause: Likely required, Myrmecocystus species from temperate/mountainous regions typically need a winter rest period. Provide 3-4 months at 10-15°C ^[2].
  • Nesting: Naturalistic setup with dry to moderately moist substrate works well. In the wild they build crater-form mounds with coarse particle entrances. Y-tong or plaster nests with narrow chambers mimic their natural nesting in soil ^[2].
• Behavior: Nocturnal foragers, workers were observed foraging on plants during overcast conditions but are primarily night-active ^[2]. They gather nectar and scavenge for protein. Like other honey ants, they likely store liquid carbohydrates in replete workers. Escape risk is moderate given their small size, use standard barrier precautions. Aggression level is unknown but likely moderate like related species.
• Common Issues: this species has rarely been collected and kept in captivity, limited husbandry information available, no confirmed colony founding or development data exists for this species, repletes require specific conditions to develop, may need established colony before storage behavior appears, nocturnal habits make observing activity more difficult, hibernation requirements are inferred but not confirmed for this specific species

Nest Preferences and Housing

In the wild, Myrmecocystus melanoticus builds distinctive crater-form tumuli, circular mounds made of coarse particles, with entrances around 15mm in diameter ^[2]. The nests extend to at least 45cm depth where repletes are found ^[2]. For captive keeping, a naturalistic setup with a dry to moderately moist substrate works well. Y-tong nests or plaster nests with narrow chambers mimic their natural soil-nesting behavior ^[2]. The key is providing a nest environment that allows them to form their characteristic storage repletes.

Feeding and Diet

Myrmecocystus melanoticus workers were observed foraging on plants, some gathering nectar and others scavenging ^[2]. This confirms they are opportunistic feeders similar to other honey ants. In captivity, offer sugar water or honey as a constant carbohydrate source. For protein, provide small insects or other appropriate-sized prey ^[2]. The key to keeping this species successfully is establishing a healthy colony that can develop repletes, specialized workers that store liquid food in their distended abdomens.

Temperature and Seasonal Care

This species comes from elevated habitats in central Mexico (6700-8600 feet) where temperatures are moderate but can drop significantly at night ^[2]. Based on the habitat, aim for a temperature range of 20-26°C during the active season, with a heating cable on one side of the nest to create a gradient. For winter, provide a diapause period of 3-4 months at 10-15°C, this is typical for Myrmecocystus species from temperate regions ^[2]. The nocturnal foraging behavior suggests they prefer cooler temperatures.

Behavior and Colony Dynamics

The most distinctive behavioral trait of Myrmecocystus melanoticus is the formation of repletes, specialized workers that store liquid food in their abdomens ^[2]. These repletes are fed by foragers who collect nectar and are kept near the nest surface for easy access. Workers are nocturnal foragers, with activity observed during overcast daytime conditions but primarily at night ^[2].

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References