Monomorium medinae

Monomorium medinae

Monomorium medinae is a tiny dark ant species endemic to the Canary Islands, specifically found on Tenerife. Workers are small, measuring around 2-3mm, with a dark brown to black coloration typical of the genus. This species is notable for producing ergatoid queens, wingless queens that develop from workers rather than flying away to found new colonies. The species was originally described under a different name (Monomorium mystes) based on these unusual queens, but was later confirmed to be the same as M. medinae. The ergatoid queen system means colonies can produce replacement reproductives without swarming, making them well-adapted to their island habitat.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to the Canary Islands, specifically Tenerife. Found in the Canary Islands archipelago off the coast of Spain. This species inhabits the volcanic islands' varied terrain, typically in drier coastal and mid-elevation areas ^[1][2].
• Colony Type: Polygynous colonies with ergatoid (wingless) queens. Colonies produce wingless queens that can serve as replacement reproductives if the primary queen dies. This allows colonies to maintain multiple egg-laying queens without nuptial flights ^[3][4].
  • Colony: Polygyne
• Size & Growth:
  • Queen: 3-4mm (ergatoid queens are smaller than typical winged queens) ^[3]
  • Worker: 2-3mm estimated based on genus typical size ^[5]
  • Colony: Unknown for this specific species, related Monomorium species typically reach several hundred workers. Estimated 300-1000 workers
  • Growth: Moderate, based on typical Monomorium development patterns
  • Development: 6-8 weeks estimated at optimal temperature (25°C) based on genus patterns (Development time is estimated from related Monomorium species. Ergatoid queens develop differently than winged queens, but the egg-to-worker timeline remains similar.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. Canary Islands have a warm subtropical climate, so these ants prefer warmer conditions. A heating cable on one side of the nest creates a suitable gradient
  • Humidity: Moderate humidity, around 50-70%. These ants are from a relatively dry island environment, so avoid overly damp conditions. Allow the nest to dry slightly between water additions
  • Diapause: Unknown for this species. Canary Islands have mild winters, so a true diapause may not be required. However, a brief cool period (15-18°C for 2-3 months) may benefit colony health
  • Nesting: In nature, they likely nest in soil under stones or in small cavities in volcanic rock. In captivity, a small test tube setup or Y-tong nest with narrow chambers works well. Keep chambers appropriately scaled to their tiny 2-3mm size
• Behavior: These are small, relatively docile ants that typically stay within their nest area. Workers are not particularly aggressive and rarely sting. They are not escape artists in terms of climbing, but their tiny size means they can slip through small gaps, use fine mesh for escape prevention. Workers likely forage for small insects and tend aphids for honeydew, similar to other Monomorium species.
• Common Issues: tiny size means escapes are likely without fine mesh barriers, ergatoid queen system is unusual, new keepers may not recognize wingless queens as reproductive, wild-caught colonies may have parasites specific to their island origin, overheating is a risk given their warm Canary Islands habitat, colonies may be slow to establish due to small colony size at founding

Housing and Nest Setup

Monomorium medinae is a tiny ant, so your housing setup must account for their small size. A standard test tube setup works well for founding colonies, use a small water reservoir with cotton barrier. For established colonies, a Y-tong (acrylic) nest with narrow chambers or a small plaster nest works nicely. The chambers should be appropriately scaled, these are not large ants, so avoid overly spacious accommodations. Escape prevention is important: even though they're not strong climbers, their tiny 2-3mm size means they can squeeze through remarkably small gaps. Use fine mesh (0.5mm or smaller) on any ventilation holes and ensure all connections are tight. A thin layer of fluon on container rims helps prevent escapes. ^[5]

Feeding and Diet

Like other Monomorium species, these ants are omnivorous with a preference for protein. Offer small live prey such as fruit flies, pinhead crickets, or tiny mealworms. They will also accept sugar sources, a small drop of honey water or sugar water can be offered occasionally. In nature, they likely forage for small insects and may tend aphids for honeydew. Feed protein prey 2-3 times per week for active colonies, and keep a constant sugar source available. Remove uneaten prey after 24-48 hours to prevent mold. Given their small size, prey items should be appropriately scaled, nothing larger than their head.

Temperature and Seasonal Care

Monomorium medinae comes from the warm Canary Islands, so they prefer temperatures in the 24-28°C range. A heating cable placed on one side of the nest creates a temperature gradient that allows ants to regulate their own temperature. Avoid temperatures below 20°C for extended periods. The Canary Islands have mild winters, so a true hibernation is likely not required. However, a brief cool period at 15-18°C for 2-3 months during winter may help maintain natural colony cycles. This cool period is optional but can promote healthier brood development in spring. Monitor colony activity, if workers become sluggish and cluster together, the temperature may be too low.

Understanding Ergatoid Queens

This species has an unusual reproductive system: instead of producing winged queens that fly away to start new colonies, M. medinae produces ergatoid queens, wingless queens that develop from worker larvae and remain in the nest. These ergatoid queens are smaller than typical winged queens (around 3-4mm) and may not be obviously different from large workers at first glance. The ergatoid system allows colonies to produce new reproductives without swarming, which is advantageous on isolated islands like Tenerife. If your colony produces ergatoid queens, this is normal and indicates a healthy, mature colony. These replacement queens can take over egg-laying duties if the primary queen dies, making the colony more resilient. ^[3][4]

Colony Growth and Development

Monomorium medinae colonies start small and grow gradually. A founding colony with an ergatoid queen may begin with just a few workers (nanitics) after 6-8 weeks at optimal temperature. Growth is moderate, expect several months to reach 50 workers, and a year or more to reach several hundred. The ergatoid queen system means colonies can have multiple egg-laying queens, which can accelerate growth once established. Be patient with new colonies, these small ants take time to build numbers. Avoid disturbing founding colonies excessively. Once workers number in the dozens, you can begin more regular feeding schedules. Colony size likely maxes out in the several hundred worker range based on related species.

Frequently Asked Questions

References