Temnothorax atlantis

Temnothorax atlantis

Temnothorax atlantis is a tiny, bicolored ant native to the Western Mediterranean region, found across Algeria, Morocco, France, Spain, and Portugal ^[1]. Workers measure just 0.55-0.84mm in head length, making them one of the smaller ant species you'll encounter ^[1]. Their most distinctive feature is their coloration: the head and gaster are dark brown to black, while the mesosoma (the middle body section) and petiole nodes are reddish or ferruginous, creating a striking contrast, though some populations can be uniformly dark brown ^[1]. These ants belong to the angustulus species group and were previously classified under different names, including T. continentalis, before being unified under T. atlantis in 2025 ^[1].

What makes T. atlantis interesting is their arboreal lifestyle, unlike many ants that nest in soil, these ants live in small cavities in dead branches, tree trunks, and wood piles ^[2]. They forage by beating on trees and bushes, and you'll often find them living alongside other tree-dwelling ants like T. affinis and Crematothorax scutellaris ^[2]. This arboreal habit means they prefer nesting in wood-based setups rather than soil colonies.

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Western Mediterranean region, Algeria, Morocco, France, Spain, and Portugal. They live in arboreal habitats, nesting in small cavities in dead branches, tree trunks, and wood piles. Found in undergrowth and often captured by beating vegetation ^[2][1].
• Colony Type: Single-queen colonies (monogyne), typical for the genus Temnothorax. Colony structure is not extensively studied but follows typical Temnothorax patterns.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 4-5mm based on genus patterns (no direct measurement available)
  • Worker: 0.55-0.84mm head length (mean CL: 687μm) ^[1]
  • Colony: Likely small colonies under 500 workers based on typical Temnothorax patterns
  • Growth: Moderate, estimated based on genus patterns
  • Development: Estimated 6-10 weeks at optimal temperature based on related species (Development time not directly studied for this species, estimates based on typical Temnothorax development patterns)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 20-24°C. They tolerate a range being from a warm Mediterranean climate. A gentle gradient is ideal.
  • Humidity: Moderate humidity around 50-60%. As arboreal ants, they prefer slightly drier conditions than ground-nesting species. Allow the nest to dry partially between waterings.
  • Diapause: Yes, as a Mediterranean species, they likely require a winter rest period of 2-3 months at 10-15°C. This aligns with their temperate distribution.
  • Nesting: Best kept in wood-based nests like Y-tong (AAC) or plaster nests that mimic their natural tree cavity habitat. They prefer tight chambers scaled to their tiny size. Test tubes can work but may need to be modified with cotton and water reservoirs.
• Behavior: Generally peaceful and non-aggressive. Workers are small but active foragers. They are arboreal and will explore their outworld actively. Escape prevention is critical due to their tiny size, they can squeeze through remarkably small gaps. Use fine mesh barriers and tight-fitting lids.
• Common Issues: escape prevention is critical, their tiny size means they can squeeze through gaps that larger ants cannot, as small arboreal ants, they dry out quickly, monitor humidity carefully, wild-caught colonies may have parasites that can devastate captive colonies, slow founding phase means beginners may lose patience, queens can take months to raise first workers, overfeeding leads to mold in small nests, remove uneaten food promptly

Housing and Nest Preferences

Temnothorax atlantis is an arboreal species that naturally nests in small cavities within dead branches, tree trunks, and wood piles ^[2]. In captivity, they do best in Y-tong (AAC) nests or plaster nests that mimic these tight, wood-like conditions. Their tiny size means you should use narrow chambers and passages scaled to their worker size, avoid large, open spaces that can stress them. Test tube setups can work but require careful humidity management since the cotton water reservoir can create conditions that are too wet for these arboreal ants. Many keepers successfull use small acrylic nests with narrow tunnels. Whatever nest type you choose, ensure excellent escape prevention, these tiny ants will find any gap.

Feeding and Diet

Like most Temnothorax species, T. atlantis likely has a varied diet consisting of small insects, honeydew, and nectar. In captivity, they readily accept small protein sources like fruit flies, pinhead crickets, and mealworms. Offer sugar water or honey water as a constant energy source. Because of their tiny size, prey items should be appropriately sized, springtails and fruit flies are ideal. Feed them small amounts every 2-3 days, removing any uneaten prey promptly to prevent mold in the nest. Their arboreal foraging habits in the wild suggest they're active hunters of small arthropods.

Temperature and Seasonal Care

Keep your colony at room temperature, ideally around 20-24°C. As a Mediterranean species from France, Spain, Morocco, and Algeria, they're accustomed to warm but not extreme conditions ^[1]. A slight temperature gradient allows workers to regulate their brood's development. During winter, they require a diapause period, reduce temperatures to 10-15°C for 2-3 months to simulate winter in their natural habitat. This rest period is important for colony health and triggers reproductive cycles. Do not skip hibernation as it can weaken the colony over time.

Behavior and Temperament

Temnothorax atlantis is a peaceful species that rarely shows aggression toward keepers. Workers are active and will readily explore their outworld in search of food. Their small size makes them appear delicate, but they're quite resilient when kept properly. One key behavior to note is their arboreal nature, in the wild, they're often collected by beating vegetation, meaning they're comfortable moving through branches and narrow spaces ^[2]. This translates to captivity as active foraging behavior. They're not aggressive and don't have a functional stinger (Myrmicinae but not in stinging tribes), making them safe to handle. However, their tiny size means escape prevention must be excellent, they can slip through gaps barely visible to the human eye.

Colony Founding

Like other Temnothorax species, T. atlantis queens are claustral, after mating, the queen seals herself into a small chamber and raises her first workers entirely on stored fat reserves ^[2]. She does not leave to forage during founding. The founding chamber should be small and dark. First workers (nanitics) are typically smaller than mature workers and appear within 6-10 weeks under optimal conditions. During this critical period, the queen is vulnerable and the nest should remain undisturbed. Once the first workers emerge, you can begin offering tiny prey items, but the queen will continue to tend the brood for some time.

Growth and Development

Colony growth is moderate but can be slow initially. The first workers (nanitics) are smaller than regular workers and the colony will gradually produce larger workers as it matures ^[1]. Based on typical Temnothorax patterns, expect 6-10 weeks from egg to first worker at room temperature. Mature colonies likely reach several hundred workers over several years. The bicolored coloration, reddish mesosoma contrasting with dark head and gaster, becomes more pronounced as workers mature ^[1]. Patience is key with this species, as founding colonies can take months to establish firm footing.

Frequently Asked Questions

References