Aphaenogaster spinosa

Aphaenogaster spinosa

Aphaenogaster spinosa is a sleek, dark ant with distinctive spines on its propodeum (the rear part of the middle body section) and a shiny appearance that reflects light strongly ^[1][2]. They are native to the Tyrrhenian region of the Mediterranean, including Corsica, Sardinia, and coastal Italy ^[1][3]. What makes this species truly unusual is their reproduction: the queens are wingless and do not participate in nuptial flights. Instead, colonies spread by budding, with queens walking away from the nest accompanied by workers ^[4][5]. They are one of the most dominant ant species in their native range, thriving in habitats from coastal scrub to mountain forests up to 1200 meters ^[1][6].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tyrrhenian region (Corsica, Sardinia, central Italy, and Switzerland) in maquis scrub, forest clearings, and coastal areas ^[1][3][7]
• Colony Type: Multi-queen colonies documented, reproduces by budding with wingless queens. Two queens observed sharing a nest with brood suggests polygynous (multiple queen) colonies are common ^[6][4]
  • Colony: Optionally polygyne
• Size & Growth:
  • Queen: Unknown, queens are wingless (ergatoid or brachypterous) and not measured in available research ^[5]
  • Worker: Approximately 4-5 mm total length (head length 1.27-1.59 mm) ^[1]
  • Colony: Unknown, likely reaches hundreds to thousands of workers based on dominance in native habitats ^[1]
  • Growth: Moderate
  • Development: Unknown, estimated 8-12 weeks at 24°C based on related Aphaenogaster species (Development time is unconfirmed for this species, temperature likely affects duration significantly)
• Antkeeping:
  • Temperature: Start around 22-26°C with a slight gradient, Mediterranean species that tolerates mild winters but benefits from winter rest
  • Humidity: Moderate humidity, nest substrate should feel damp but not waterlogged, matching their preference for well-drained soils
  • Diapause: Yes, winter rest from November to February recommended, though they may remain semi-active at cooler room temperatures
  • Nesting: Soil-based nests, provide a naturalistic setup with sand/soil mix or a Y-tong nest with open chambers. They nest openly in soil in nature ^[8]
• Behavior: Swift, active foragers that dominate their habitat through efficiency rather than aggression ^[9][10]. They are seed dispersers and will forage widely. Their small size means they can squeeze through tiny gaps ^[1]
• Common Issues: wingless queens cannot be captured after nuptial flights, you must collect colony fragments with workers present, colonies reproduce by budding and may split unexpectedly in captivity if given too much space, small worker size requires excellent escape prevention with fine mesh barriers, founding behavior is unconfirmed, single queens may fail without workers present

Wingless Queens and Colony Founding

Unlike nearly all other ants, Aphaenogaster spinosa queens are wingless and do not fly ^[5][4]. You will not find these queens walking on the ground after a nuptial flight. Instead, colonies reproduce by budding: a queen walks away from the parent nest accompanied by workers and brood to establish a new nest nearby ^[4]. In the wild, researchers found queens difficult to capture alone, instead discovering them in nests with workers and brood present ^[6]. This suggests that if you want to start a colony, you should collect an entire colony fragment including workers, not just a lone queen. Single queen founding has not been documented and may be impossible. If you acquire a queen without workers, provide her with host workers from a related colony if possible, or be prepared for high failure rates.

Nest Preferences

In nature, Aphaenogaster spinosa builds open nests in soil, often in sunny clearings, paths, or under stones in maquis and forest habitats ^[8][6]. They are epigeic, meaning they forage and nest on the surface rather than deep underground ^[1]. In captivity, provide a naturalistic setup with a mix of sand and soil that allows for tunneling, or use a Y-tong nest with open, shallow chambers. They prefer well-drained conditions, avoid constantly soggy substrates that could mold. A flat stone or piece of wood covering part of the nest area mimics their natural preference for nesting under cover objects.

Feeding and Diet

These ants are effective seed dispersers in their native habitat, suggesting they consume and store seeds ^[10]. Offer a mixed diet of seeds (such as dandelion, chia, or millet) and protein sources. They accept small live insects like fruit flies, springtails, and small cricket nymphs. Provide sugar water or honey water in a test tube or liquid feeder. Remove uneaten protein within 24-48 hours to prevent mold in their soil-based nest.

Temperature and Seasonal Care

As a Mediterranean species, Aphaenogaster spinosa tolerates warm summers and mild winters. Keep the nest area at 22-26°C during the active season (March to October) with a gentle heat gradient. In winter (November to February), reduce temperature to 15-18°C to simulate their natural seasonal cycle. They may remain somewhat active during this period but will slow down significantly. Do not let them freeze, their native range rarely experiences hard frosts.

Behavior and Temperament

Aphaenogaster spinosa are swift, graceful foragers that move quickly across the substrate ^[9]. They are dominant in their native Corsican habitats, often outcompeting other ant species ^[10]. While not typically aggressive toward humans, they are efficient predators and will attack small prey readily. Their small size (workers around 4-5 mm) makes them excellent escape artists, you must use fine mesh (under 1 mm) and barriers like Fluon on all ventilation and access points ^[1].

Frequently Asked Questions

References