Monomorium ellenarium

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Absheron Peninsula in Azerbaijan, wild arid steppe near sandy beach between Shuvelyan and Dubendi settlements at coordinates 40.46541,50.24801. This is a hot, dry coastal area with sparse vegetation ^[1].
• Colony Type: Inquiline species that cohabitates with larger ants (Cataglyphis nodus and Messor laboriosus). Colonies contain ergatoid gynes (wingless reproductive females) rather than typical alate queens. The captive colony successfully produced new brood for over 3 months with no dealate queens present, confirming ergatoid reproduction ^[1].
• Size & Growth:
  • Queen: Ergatoid (wingless) queens present, typical dealate queens not produced ^[1]
  • Worker: 2.3-3.0mm ^[1]
  • Colony: Likely small, estimated under 100 workers based on inquiline lifestyle
  • Growth: Unknown, likely slow
  • Development: Unknown, no specific data available for this recently described species (Development timeline has not been documented. Related Monomorium species typically develop in several weeks at warm temperatures.)
• Antkeeping:
  • Temperature: Keep at 24-28°C based on their Azerbaijani arid steppe origin. Provide a gentle temperature gradient so ants can self-regulate.
  • Humidity: Low to moderate, arid steppe species. Keep test tube water reservoir moderate in size, allow substrate to dry partially between water additions.
  • Diapause: Likely minimal or none, being from a hot arid region, they probably don't require true hibernation. A slight cooling period during winter months may be beneficial.
  • Nesting: Test tube setup works well for small colonies. Use small chambers scaled to their tiny size. Given their inquiline nature, establishing independent colonies may be challenging.
• Behavior: Very small, timid ants that rely on host colonies for protection and food resources. They show no aggression toward host species and are accepted by larger ants. Escape prevention is critical due to their tiny size, they can slip through the smallest gaps. Workers are extremely small and any sting would be negligible to humans.
• Common Issues: escape prevention is critical, they are extremely tiny and can slip through standard barriers, inquiline lifestyle makes them difficult to establish, they may depend on host association, colony size remains small, don't expect rapid population growth, ergatoid reproduction means no nuptial flights to catch new queens, may be difficult to feed, likely requires sugar sources and small protein items

Housing and Nest Setup

Monomorium ellenarium requires careful housing due to their extremely small size. A standard test tube setup works well, use a 16x150mm test tube half-filled with water and blocked with cotton, similar to how they were successfully maintained in the original description study ^[1]. The tiny workers at just 2.3-3.0mm mean that even standard test tube setups need excellent escape prevention. Apply fluon on container edges or use tight-fitting lids. For a standalone colony, use small nests with chambers appropriately sized for their tiny workers. Avoid large, open spaces that may stress such small ants.

Feeding and Diet

In captivity, M. ellenarium has been successfully maintained on raw honey and a 1:4 sugar-to-water mix ^[1]. This suggests they can accept sugar sources, which is interesting given that in their natural habitat, there is a scarcity of surface plants and sugar-producing insects. Researchers speculate they may tend to root aphids underground to access honeydew ^[1]. For your colony, offer sugar water or honey regularly as a constant energy source. Protein should be offered in small quantities, tiny prey items like springtails, fruit flies, or small mealworm pieces may be accepted. Given their inquiline lifestyle, they may have specialized dietary needs, so be prepared to experiment with different foods. Remove uneaten food promptly to prevent mold.

Temperature and Seasonal Care

Being from the Absheron Peninsula in Azerbaijan, a hot, arid coastal region, M. ellenarium prefers warm conditions. Maintain temperatures in the 24-28°C range, which can be achieved with a heating cable on one side of the nest to create a gentle gradient. This allows the ants to self-regulate their temperature preferences. Unlike temperate species that require hibernation, these ants come from a region with mild winters and hot summers, so they likely don't need a true diapause period. However, a slight reduction in temperature during winter months (dropping to around 18-20°C) may help simulate natural seasonal cycles. Monitor colony activity, if they become less active in winter, reduce feeding frequency accordingly. ^[1]

Understanding Their Unique Biology

Monomorium ellenarium is an extraordinary species with several unusual biological traits. First, they are inquiline ants, they live within the nests of much larger ant species (Cataglyphis nodus and Messor laboriosus) without being attacked, feeding on food scraps or possibly consuming host brood ^[1]. This dependent lifestyle means they may struggle to establish independent colonies. Second, they reproduce through ergatoid gynes, wingless queens that develop within the colony rather than typical alate (winged) queens that disperse for mating flights ^[1]. This means you won't observe nuptial flights, and colony reproduction happens internally. The colony observed in captivity successfully produced new brood for over 3 months without any individual showing typical dealate queen traits, confirming the presence of ergatoid reproduction ^[1]. This makes M. ellenarium one of the more unusual species available in the antkeeping hobby.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References