Plagiolepis atlantis

Plagiolepis atlantis

Plagiolepis atlantis is a tiny ant species native to North Africa and the eastern Mediterranean. Workers are extremely small at just 0.4-0.5mm in head size, making them one of the smallest ants you can keep. They have the typical Plagiolepis appearance with a pale yellowish-brown to reddish coloration and relatively long antennae. This species nests in soil beneath stones in humid areas overgrown with macchia or forest vegetation. Colonies are polygynous, meaning they contain multiple queens working together. Originally described as a variety of Plagiolepis barbara, it was elevated to full species status in 2020 and is now recognized as distinct from the related Plagiolepis schmitziii group.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: North Africa (Algeria, Tunisia) and eastern Mediterranean (Turkey). They nest in soil beneath stones in humid areas overgrown with macchia or forest vegetation ^[1].
• Colony Type: Polygynous, colonies contain multiple queens working together ^[1]. This is a key trait to understand when keeping them, as multiple egg-laying queens support larger colony sizes.
  • Colony: Polygyne
• Size & Growth:
  • Queen: Estimated slightly larger than workers, likely 1.5-2mm based on genus patterns
  • Worker: 0.4-0.5mm in head size (cephalic size 404-533 μm) ^[1]
  • Colony: Likely several hundred workers based on polygynous colony structure and related species
  • Growth: Moderate, typical for small Plagiolepis species
  • Development: Estimated 6-8 weeks at optimal temperature based on genus patterns for small Formicinae (Development time inferred from related Plagiolepis species, specific data not available for this species)
• Antkeeping:
  • Temperature: Keep at room temperature, roughly 20-26°C. They naturally occur in warm Mediterranean climates so moderate heat is beneficial. A gentle gradient allowing workers to self-regulate is ideal.
  • Humidity: Require humid conditions, they naturally inhabit damp, shaded areas. Keep the nest substrate consistently moist but not waterlogged. Provide a water tube for drinking access.
  • Diapause: Likely a mild winter slowdown period given their North African/Mediterranean origin. A period of cooler temperatures (10-15°C) for 2-3 months may benefit colony health.
  • Nesting: Soil-nesting species that naturally nests beneath stones. In captivity, a naturalistic setup with moist substrate (like a mix of soil and sand) and flat stones or a Y-tong/plaster nest works well. They need tight chambers scaled to their tiny size.
• Behavior: These are tiny, active ants that form polygynous colonies. Workers are non-aggressive and primarily foragers for honeydew and small prey. Their extremely small size means escape prevention is critical, they can squeeze through standard test tube cotton and tiny gaps. They are not known to sting and pose no danger to keepers. Foraging activity is moderate, with workers readily searching for sugar sources and small insects.
• Common Issues: escape prevention is critical due to their extremely tiny size, use fine mesh barriers and tight-fitting lids, polygynous colonies may have queen competition or aggression during founding, monitor when introducing new queens, small colony size at founding makes them vulnerable to stress and dehydration, humidity management is tricky, too wet causes mold, too dry kills brood, wild-caught colonies may carry parasites that can decimate captive colonies

Housing and Nest Setup

Plagiolepis atlantis requires careful housing due to their extremely small size. These tiny ants can escape through gaps that would hold back much larger species. Use test tubes with tight cotton or, better yet, fluon barriers on the rim. For the nest itself, a naturalistic setup with moist substrate (a mix of soil and sand works well) beneath flat stones simulates their natural environment. Alternatively, a Y-tong or plaster nest with very small chambers can work, but ensure the passages are appropriately sized, these ants are barely half a millimeter long. The nest area should stay humid but not wet, with some drier areas available for the ants to self-regulate. ^[1]

Feeding and Diet

Like most Plagiolepis species, P. atlantis is omnivorous with a preference for sweet liquids. Workers readily collect honeydew from aphids and will drink sugar water or honey diluted with water. For protein, offer tiny prey items, fruit flies, pinhead crickets, or small mealworms cut into pieces. The larvae are omnivorous ^[2], so both sugar and protein sources support brood development. Feed small amounts of sugar water every few days and protein once or twice weekly. Remove uneaten prey within 24 hours to prevent mold.

Temperature and Seasonal Care

These ants come from warm Mediterranean regions, so they do best at room temperature or slightly above, aim for 22-26°C. They can tolerate brief cooler periods but prolonged cold slows or stops brood development. During winter, a mild hibernation period of 2-3 months at 10-15°C may benefit colony health, mimicking their natural seasonal cycle in North Africa. However, avoid very cold temperatures as they are not adapted to harsh winters. A small heating cable on one side of the nest can create a temperature gradient if your room runs cool. ^[1]

Colony Structure and Multi-Queen Care

Plagiolepis atlantis is polygynous, meaning colonies naturally have multiple queens. This is unusual among ant species and has implications for captive care. Unlike monogyne species where you keep a single queen, polygynous colonies can support multiple egg-laying queens simultaneously. This typically leads to faster colony growth initially but requires attention to colony harmony. When starting a colony, you may keep multiple founding queens together. However, if queens fight, separate them. Established polygynous colonies are generally stable, with queens tolerated by workers. ^[1]

Escape Prevention

This is the most critical aspect of keeping P. atlantis. Workers are only about 0.5mm in size, smaller than many springtails commonly used as feeders. They can easily squeeze through standard test tube cotton, tiny gaps in lids, and even through fine mesh that stops larger ants. Apply fluon (insect barrier) to all enclosure rims. Use containers with tight-fitting lids, not cotton-stoppered tubes for long-term housing. If using mesh, ensure it's fine enough (at least 0.3mm or finer). Check enclosures daily and immediately seal any gaps you discover. This species will escape if given half a chance. ^[1]

Frequently Asked Questions

References