Myrmecocystus melanoticus

Myrmecocystus melanoticus

Myrmecocystus melanoticus is a small to medium-sized honey ant native to central Mexico, found only in the states of Hidalgo and Puebla at elevations between 6700-8600 feet ^[1]. Workers are light to medium yellowish-brown with a darker gaster, measuring 1.10-1.83mm in head length with notably short, erect hairs on the eyes that exceed the diameter of the eye facets, a key identification feature ^[2]. This species is closely related to Myrmecocystus mexicanus and may eventually be considered a geographic variant of that species.

What makes this species interesting is its known presence of repletes, specialized workers that store liquid food in their expanded abdomens, giving them a distinctive honeypot appearance. Local residents in the region recognize these repletes, calling them 'venitas' ^[2]. These ants are nocturnal foragers, with workers observed gathering nectar and scavenging on plants during overcast daytime hours, though most foraging occurs at night ^[2].

Quick Summary

• Difficulty: Unknown, likely 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 ^[2].
• Colony Type: Colony structure is unconfirmed. Based on related Myrmecocystus species, likely single-queen colonies with potential for replete formation for food storage.
• Size & Growth:
  • Queen: Unknown, not described in available literature ^[2]
  • Worker: 1.10-1.83mm head length (HL), with HW 0.63-1.73mm ^[2]
  • Colony: Unknown, related species typically reach several hundred workers
  • Growth: Unknown, likely moderate based on genus patterns
  • Development: Unknown, estimated 6-10 weeks based on related Myrmecocystus species (No direct development data available for this species. 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.
  • Diapause: Likely required, Myrmecocystus species from temperate/mountainous regions typically need a winter rest period. Provide 3-4 months at 10-15°C.
  • 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.
• 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 of relatively uniform size, with entrances around 15mm in diameter ^[2]. The nests extend to at least 45cm depth where repletes are found. For captive keeping, a naturalistic setup with a dry to moderately moist substrate works well. Y-tong (acrylic) nests or plaster nests with narrow chambers mimic their natural soil-nesting behavior. The key is providing a nest environment that allows them to form their characteristic storage repletes, a slightly humid chamber where they can cache liquid food seems beneficial. Test tube setups can work for founding colonies but may not allow proper replete development.

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, they collect sugary nectar but also scavenge for protein. In captivity, offer sugar water or honey as a constant carbohydrate source. For protein, provide small insects, mealworms, or other appropriate-sized prey. 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. These repletes are the defining feature of honey ants and what makes them unique among ant species.

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. The elevation suggests they experience cooler temperatures than typical lowland tropical ants. For winter, provide a diapause period of 3-4 months at 10-15°C, this is typical for Myrmecocystus species from temperate regions. The nocturnal foraging behavior suggests they prefer cooler temperatures and may be most active during evening and night hours in captivity.

Behavior and Colony Dynamics

The most distinctive behavioral trait of Myrmecocystus melanoticus is the formation of repletes, specialized workers that store liquid food (nectar and carbohydrates) in their abdomens, causing them to become swollen, honeypot-like structures ^[2]. These repletes are fed by foragers who collect nectar and are kept near the nest surface (within 45cm) for easy access. This food storage system allows the colony to survive lean periods. Workers are nocturnal foragers, with activity observed during overcast daytime conditions but primarily at night. The species shows typical Myrmecocystus caution in foraging, they were not observed foraging at 1530 hours despite cloudy, rainy conditions ^[2].

Frequently Asked Questions

References