Aphaenogaster ulibeli

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Spain (Western Central Massif), deciduous Mediterranean forests with Castanea sativa and Quercus robur at around 1010m elevation ^[1][3]
• Colony Type: Unconfirmed, colony structure has not been documented in the research
• Size & Growth:
  • Queen: ~5-7mm, inferred from genus patterns, smaller than related Aphaenogaster gibbosa ^[1]
  • Worker: ~4-6mm, inferred from genus patterns ^[1]
  • Colony: Unknown, no colony size data exists in the research
  • Growth: Moderate
  • Development: Unknown for this species, development time is unconfirmed (Alated queens and males found in early June, suggesting summer breeding cycle)
• Antkeeping:
  • Temperature: Keep at room temperature (around 20-25°C) during active season. As a temperate species from central Spain, provide a cool winter period ^[1]
  • Humidity: Moderate, these ground-nesting ants prefer moist substrate similar to the conditions under stones in forest habitats ^[1][2]
  • Diapause: Yes, temperate species requiring winter rest. Nuptial flights occur in summer (June-July), indicating a seasonal cycle ^[1]
  • Nesting: Ground nester that naturally nests under stones. Provide a nest with tight chambers, stone nests, plaster nests, or Y-tong (AAC) setups work well ^[1][2]
• Behavior: Typical Aphaenogaster ground-foraging scavenger behavior. They are defensive but not particularly aggressive. Moderate escape risk, small ants but not known as escape artists.
• Common Issues: wild-caught colonies may introduce mites or parasites from natural stone habitats., difficulty distinguishing from Aphaenogaster gibbosa without magnification and knowledge of key traits., endemic status creates conservation responsibility, lost queens cannot be replaced from the wild outside Spain., seasonal care requires proper winter diapause management or colonies may fail.

Identification: Telling ulibeli from gibbosa

The main confusion in identification is with their close relative Aphaenogaster gibbosa. Workers of ulibeli are blackish brown to black, while gibbosa are lighter brown ^[1]. Check the head sculpture: ulibeli has parallel striations running lengthwise, whereas gibbosa has reticulated (net-like) patterns ^[1]. When viewed from the side, ulibeli shows a continuous smooth line from the pronotum to mesonotum, but gibbosa has a distinctly humped mesonotum that breaks this line ^[1]. The petiole node is ellipsoidal and symmetrical in ulibeli, but has a distinct angle between faces in gibbosa ^[1]. Queens of ulibeli are also smaller than gibbosa queens and have relatively shorter wings that only reach the gaster tip ^[1].

Nest Preferences in Nature and Captivity

In their Spanish forest habitat, these ants nest under stones on the ground in deciduous woodlands ^[1][2]. They prefer the stable, humid microclimate provided by stone cover in mixed forests with chestnut and oak trees at elevations around 1010 meters ^[1]. For captive colonies, recreate this with flat stone nests, plaster nests, or Y-tong (aerated concrete) setups that provide tight, narrow chambers similar to the spaces under stones ^[1]. The nest should offer good humidity retention but with some slightly drier areas available. Avoid tall, open spaces that these ground-dwelling ants would find unnatural.

Seasonal Care and Diapause

This is a temperate Mediterranean species with clear seasonal activity patterns. Alated queens and males are found in nests in early June, and males are captured in pitfall traps in late July (27th-29th), indicating summer nuptial flights ^[1][2]. You will need to provide a winter rest period from approximately November to February, cooling the colony gradually to around 10-15°C. During this period, the ants will slow down or stop brood development. Resume normal temperatures in March when you would naturally find them active in the wild. Without this seasonal break, temperate ant colonies often fail to thrive long-term.

Feeding and Diet

While specific diet studies are lacking for this species, Aphaenogaster ants are generalist scavengers. They collect dead insects and seeds in nature. Offer small pieces of insects such as fruit flies, cricket legs, or mealworm segments. Provide seeds such as chia, poppy, or millet. They likely accept sugar water or honey water as well, though this is not specifically documented for this species. Feed protein twice weekly and keep a sugar source available constantly. ^[2]

Nuptial Flights and Founding

Nuptial flights occur during summer, specifically June and July. Alated queens and males are found in nests in early June, and males are captured in pitfall traps late in July (27th-29th) ^[1][2]. Founding behavior has not been directly observed for this species. If you capture a founding queen after flights in June or July, provide a small, dark, humid chamber such as a test tube setup with water reservoir and minimal disturbance until the first workers hatch.

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