Monomorium algiricum

Monomorium algiricum

Monomorium algiricum is a small dark brown ant native to the Mediterranean region, found in Algeria and southern Spain. Workers measure 1.8-2.5mm and are notably smaller than the ergatoid (permanently wingless) queens, which reach around 2.7mm. Unlike most ant species, M. algiricum queens are ergatoid, they never develop wings and have a worker-like thorax with reduced volume and fused flight sclerites. This species nests in mountainous open shrubland at elevations around 600m, with colonies building nests 30-55cm deep in rocky soil. Colonies range from a few hundred to nearly 4000 workers, and both single-queen and multi-queen colonies exist throughout the year.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Algeria and southern Spain (Iberian Peninsula), living in mountainous open shrubland with scattered olive and almond trees at around 600m elevation ^[1][2].
• Colony Type: Facultatively polygynous, both monogyne (single queen) and polygyne (multiple queens,4-41) colonies exist year-round ^[1]. Queens are ergatoid (wingless) and can coexist with previous cohorts. Colonies reproduce through fission/budding rather than nuptial flights.
  • Colony: Optionally polygyne
• Size & Growth:
  • Queen: 2.68 ± 0.13 mm (ergatoid queen, gaster excluded) ^[1]
  • Worker: 1.76 ± 0.08 mm, total length 2.2-2.5mm ^[1][3]
  • Colony: 228-3999 workers, averaging around 1300 in spring and 2100 in autumn ^[1]
  • Growth: Moderate, seasonal growth with worker numbers significantly higher in autumn ^[1]
  • Development: Unconfirmed, no specific development data available for this species (Egg-laying stops from autumn until spring due to seasonal dormancy. New sexuals are produced at the end of summer.)
• Antkeeping:
  • Temperature: Keep at room temperature around 20-24°C. In the wild, foraging stops from November to early April due to cold, and nest activity halts during extreme summer heat (July-August). A gentle temperature gradient allows ants to self-regulate.
  • Humidity: Moderate, native to Mediterranean shrubland with seasonal dry periods. Keep nest substrate moderately moist but allow some drying between waterings. Avoid waterlogging.
  • Diapause: Yes, colonies become dormant from November to early April (winter) and also reduce activity during peak summer heat (July-August) when nest entrances are blocked ^[1]. Reduce feeding and keep cool during these periods.
  • Nesting: Y-tong (AAC) or plaster nests work well. In nature, they nest 30-55cm deep in rocky soil. Provide deep substrate or a nest with adequate depth. Avoid excessive heat that would dry out the nest.
• Behavior: Peaceful temperament, these are not aggressive ants. Workers forage individually and are not territorial or defensive. Ergatoid queens walk with workers to establish new colonies through budding rather than dispersing via nuptial flights. Escape risk is moderate due to small size, use standard barrier methods.
• Common Issues: Seasonal dormancy can alarm keepers, reduced activity November-April and July-August is normal, Multi-queen colonies have lower individual queen fecundity, which may affect growth rate, Wolbachia infection present in wild colonies, may affect breeding in captivity ^[4], Deep nesting requirement means they need appropriate formicarium setup, Colony fission is the only reproduction method, no nuptial flights to catch

Understanding Ergatoid Queens

Monomorium algiricum has a unique reproductive system: all queens are ergatoid, meaning they are permanently wingless and never develop the large wings typical of most ant queens. Their thorax is worker-like with decreased volume and fused flight sclerites because they lack wing muscles ^[1]. This is unusual, most Monomorium species have winged queens, but M. algiricum is specifically known for its ergatoid condition ^[4]. Queens are considerably bigger than workers (2.68mm vs 1.76mm) and have a larger gaster for egg production, with 28-40 ovarioles ^[1]. Because they cannot fly, new queens disperse on foot alongside workers when colonies split, this is called dependent colony foundation (DCF) or budding ^[1].

Colony Structure and Reproduction

This species shows remarkable flexibility in colony structure. Both monogynous (single queen) and polygynous (multiple queens,4-41) colonies exist throughout the year ^[1]. In polygynous colonies, individual queens are less fecund than in monogynous colonies, this is a trade-off where sharing reproduction reduces each queen's output. New ergatoid queens and males are produced during a short period at the end of summer. Queens mate soon after emergence, and newly mated queens can coexist with older queens from previous years ^[1]. Colonies reproduce exclusively through fission, no small incipient colonies with a single queen have ever been found in the wild. Instead, ergatoid queens walk with groups of workers to new nesting sites to establish satellite colonies.

Seasonal Activity Patterns

Monomorium algiricum has pronounced seasonal cycles tied to Mediterranean climate. Foraging and above-ground activity completely stops from November through early April due to cold temperatures ^[1]. Similarly, ants stay inside during July and beginning of August when extreme heat and dry conditions prevail, nest entrances are actually blocked during this period. This means colonies are effectively dormant for about 6 months of the year with no foraging and no egg-laying ^[1]. Egg-laying stops in autumn and does not resume until spring. Worker numbers are significantly higher in autumn colonies (around 2100) compared to spring colonies (around 1300), reflecting the growth season ^[1]. For keepers, this means reduced feeding during winter and summer dormancy periods is completely normal.

Housing and Nest Setup

In the wild, M. algiricum nests at depths of 30-55cm in rocky soil, preferring mountainous shrubland habitat at around 600m elevation ^[1]. For captivity, Y-tong (AAC) nests or plaster formicariums work well since they provide darkness and humidity control. The nest should have adequate depth to accommodate their natural tunneling behavior. Keep the nest substrate moderately moist, damp but not waterlogged, with some drier areas available. Room temperature around 20-24°C is suitable, with a gentle gradient if possible. Because they are small ants (workers under 2.5mm), standard escape prevention with tight-fitting lids and barrier gel at connections is sufficient.

Feeding and Diet

Like most Monomorium species, these ants are omnivorous and will accept typical ant foods including sugar sources (honey, sugar water), protein (small insects, mealworms), and possibly seeds. Their small size means prey items should be appropriately sized, fruit flies, pinhead crickets, or small mealworm pieces work well. Feed protein 2-3 times per week and keep sugar water available constantly. During winter and summer dormancy periods, reduce or stop feeding entirely since colonies are inactive. Remove uneaten food promptly to prevent mold.

Frequently Asked Questions

References