Scientific illustration of Plagiolepis ampeloni ant - showing key identification features including head, thorax, and gaster.

Plagiolepis ampeloni

Polygynous Parasitic Queen No Gamergate
Sci. Name
Plagiolepis ampeloni
Tribe
Plagiolepidini
Subfamily
Formicinae
Author
Faber, 1969
Distribution
Found in 2 countries
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Introduction

Plagiolepis ampeloni is a rare workerless social parasite that lives entirely within the nests of its host species. Queens are dark brown and lack their own worker caste; they depend on host workers from Plagiolepis vindobonensis or the P. pallescens complex for food and brood care . This species is one of the rarest ants in the world, with confirmed records from Austria, Hungary, Slovenia, Slovakia, South Tyrol (Italy), and Turkey . Described by Faber in 1969 from Austria, it represents a specialized evolutionary branch that has lost the ability to form its own colony .

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Status by country, from Kass et al. 2022 & Wong et al. 2023

Native Invasive Introduced (indoor) Intercepted Unknown
Data Sources
Year Range 2000 - 2026

Quick Summary

  • Difficulty: Expert
  • Origin & Habitat: Found in the Palaearctic region: Austria, Hungary, Slovenia, Slovakia, South Tyrol (Italy), and Turkey. Inhabits warm, dry grassland habitats (thermophilic) in the Pannonian eastern and southern regions of Austria [7][3].
  • Colony Type: Workerless permanent social parasite (inquiline). Queens live in host ant nests, produce eggs that host workers raise. No workers of their own exist, the species is entirely dependent on its host colony [2][3].
  • Size & Growth:
    • Queen: Approximately 3-4 mm, inferred from Plagiolepis genus
    • Worker: Workerless species, no workers produced [3]
    • Colony: Colony size is limited by host colony capacity. Multiple parasite queens may coexist in a single host nest [2].
    • Growth: Unknown, development occurs within host colony
    • Development: Unknown, eggs are raised by host workers (Development occurs within the host colony and is cared for by host workers rather than by P. ampeloni individuals)
  • Antkeeping:
    • Temperature: Keep warm, roughly 20-25°C, based on thermophilic nature [7].
    • Humidity: Keep humidity moderate, based on dry grassland habitat [7].
    • Diapause: Unknown, no information available.
    • Nesting: Cannot be kept independently. Requires established host colony of Plagiolepis taurica or P. pallescens complex. This makes captive keeping extremely difficult and not recommended.
  • Behavior: Queens are entirely dependent on host workers. They do not forage, do not have workers, and cannot survive outside the host nest. The species produces sexual forms (queens and males) that the host workers raise alongside the host brood [2]. This is NOT a species suitable for typical antkeeping, it requires a host colony to survive.
  • Common Issues: this species cannot be kept without its host colony, attempting to keep P. ampeloni alone will result in death, extremely rare in the wild and protected in many regions, should not be collected, host species (P. vindobonensis) may be difficult to establish and maintain, legal concerns, species is listed as vulnerable (VU) and may be protected, last confirmed sighting in Austria was in the 1970s, possibly extinct in parts of its range due to habitat destruction [3]

Why This Species Is Not Suitable for Typical Antkeeping

Plagiolepis ampeloni is a workerless permanent social parasite, an inquiline. This means it cannot form its own colony. The queens have no workers of their own and are entirely dependent on host ant workers for food and brood care [2][3]. The host species is Plagiolepis taurica or species in the Plagiolepis pallescens complex [4][8]. Without a living host colony, P. ampeloni queens cannot survive. This makes keeping this species fundamentally different from all other ant species and extremely challenging, you would need to first establish a healthy host colony, then successfully introduce the parasite, which is not guaranteed to be accepted. This species is NOT recommended for antkeepers under any circumstances.

Conservation Status and Legal Considerations

Plagiolepis ampeloni is listed as Vulnerable (VU) on the IUCN Red List [9]. It is considered one of the rarest ants in the world, with confirmed records from only a handful of locations in Central Europe and Turkey [3]. In Lower Austria, it is classified as 'Regionally Extinct' (Category 0) due to habitat destruction, the last confirmed sighting was in the 1970s in the Jauerling area [3]. The primary threats are habitat destruction through ploughing and afforestation of semi-dry grasslands [3]. This species should NOT be collected from the wild. It may be protected under national wildlife regulations in some European countries.

Distribution and Habitat

This species is known from a limited range in the Palaearctic region: Austria, Hungary, Slovenia, Slovakia, South Tyrol (Italy), and Turkey [5][10]. It is a thermophilic (warmth-loving) species found in warm, dry grassland habitats, particularly in the Pannonian eastern and southern regions of Austria [7]. The species prefers semi-dry grassland environments where its host species (Plagiolepis taurica) lives.

Host Species Requirements

If attempting to study this species in captivity (which is not recommended), you would need a healthy colony of Plagiolepis taurica or a species from the P. pallescens complex as the host [4][8]. The host workers care for the parasite queen's eggs and raise them to maturity alongside host brood. The relationship is obligate, P. ampeloni cannot survive without its specific host. This is a permanent social parasite, meaning the parasite queen lives permanently in the host nest rather than temporarily invading to found a colony.

Frequently Asked Questions

Can I keep Plagiolepis ampeloni as a pet ant?

No. This is a workerless social parasite that cannot survive without a host colony of Plagiolepis taurica or P. pallescens complex species. It is not suitable for antkeeping and is considered one of the rarest ants in the world.

How do I get Plagiolepis ampeloni?

You should not attempt to obtain this species. It is listed as Vulnerable on the IUCN Red List and may be protected by law in some European countries. Additionally, keeping it would require first establishing a host colony, which is extremely difficult.

Does Plagiolepis ampeloni have workers?

No. This is a workerless species, the queens produce no workers of their own. All brood care is performed by host workers from the Plagiolepis taurica or P. pallescens complex colony.

What does Plagiolepis ampeloni eat?

The parasite queen is fed by host workers through trophallaxis (mouth-to-mouth feeding). The parasite does not forage for itself, it is entirely dependent on the host colony for nutrition.

Where does Plagiolepis ampeloni live?

It lives exclusively in the nests of its host species (Plagiolepis taurica and P. pallescens complex). The species is known from Austria, Hungary, Slovenia, Slovakia, South Tyrol (Italy), and Turkey, in warm, dry grassland habitats.

Why is Plagiolepis ampeloni so rare?

This species is a specialized permanent social parasite that depends entirely on specific host ant species. It has lost the ability to form its own colonies. Additionally, its habitat (semi-dry grasslands) has been destroyed by agriculture and afforestation. It may be extinct in parts of its former range in Austria.

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References

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