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

Aenictus concavus

Non-Parasitic Queen Nein Gamergate
Wiss. Name
Aenictus concavus
Unterfamilie
Dorylinae
Autor
Jaitrong & Yamane, 2013
Verbreitung
In 0 Ländern gefunden

Einleitung

These are tiny army ants from Southeast Asia, with workers measuring just 2.2-2.3 mm long . You can recognize them by their distinctive head shape: the back of the head is strongly concave (scooped out), with a noticeable bump on each corner . Their bodies are reddish brown with a lighter yellowish-brown gaster and legs . So far, scientists have only found workers - no queens or males have been documented . They live in lowland wet evergreen forests near streams and in bamboo forests in Thailand and Vietnam . As members of the Dorylinae subfamily (the true army ants), they likely live a nomadic lifestyle, forming temporary living nests called bivouacs made from the bodies of the workers themselves. They probably prey on other social insects like termites and other ant species, though specific hunting behavior for this species hasn't been observed .

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Status nach Land, von Kass et al. 2022 & Wong et al. 2023

Heimisch Invasiv Eingeschleppt (innen) Abgefangen Unbekannt
Datenquellen
Jahresbereich 2000 - 2026

Quick Summary

  • Difficulty: Expert
  • Origin & Habitat: Lowland wet evergreen forests near streams and bamboo forests in Thailand and Vietnam [1][2].
  • Colony Type: Unknown, only the worker caste has been documented [1].
  • Size & Growth:
    • Queen: Unknown, no queens documented [1].
    • Worker: 2.20-2.30 mm total length [1].
    • Colony: Unknown, likely large based on typical Aenictus patterns.
    • Growth: Unknown.
    • Development: Unknown, no developmental data exists for this species. (Army ants typically have rapid brood development in warm conditions, but specific timelines for Aenictus concavus are unstudied.)
  • Antkeeping:
    • Temperature: Tropical warmth estimated at 24-28°C based on lowland Thai habitat, start at 25°C and adjust based on activity levels.
    • Humidity: High humidity required, substrate should be damp to wet, matching their wet evergreen forest habitat near streams [1].
    • Diapause: No, tropical species that remains active year-round [2].
    • Nesting: Unknown for captivity. In nature they form temporary bivouacs (living nests) rather than permanent structures [2].
  • Behavior: Army ant behavior, nomadic and predatory. Workers are extremely small (2.2mm) and will escape through the tiniest gaps in standard ant keeping equipment [1].
  • Common Issues: no queens are known to science, making captive colony establishment currently impossible., extremely small size (2.2mm) means they can escape through gaps in standard mesh and test tube cotton., army ant biology requires massive foraging ranges and food quantities impractical for home keeping., limited documentation, the species has only been collected seven times (the type series), indicating how rare and poorly understood they are [1].

Why This Species Is Not Currently Suitable for Captive Keeping

You cannot currently keep Aenictus concavus in captivity because no reproductive queens have ever been documented [1]. Without a queen, a colony cannot establish or replace workers. Even if queens were available, army ants present extreme challenges: they require enormous amounts of live prey daily, need massive foraging spaces far beyond standard formicaria, and maintain nomadic lifestyles that don't translate to static nest setups. The species has only been collected seven times (the type series), indicating how rare and poorly understood they are [1].

Identification and Physical Characteristics

Workers are among the smallest ants you might encounter, at just 2.2-2.3 mm long [1]. The head is longer than wide with a strongly concave (scooped-out) back margin, this gives the species its name 'concavus' [1]. Look for a distinct bump on each corner of the back of the head when viewed from the side [1]. The antennae are short, not reaching two-thirds of the way to the back of the head [1]. The body is smooth and shiny, reddish-brown on the head and thorax, with a yellowish-brown gaster and legs [1].

Natural Habitat and Climate

These ants come from the lowlands of Thailand and Vietnam, specifically from wet evergreen forests near streams and bamboo forests [1][2]. The type series was collected at Hin Dad Waterfall in Chanthaburi Province, Thailand, suggesting they prefer moist, shaded environments near water [1]. As a tropical species, they do not experience seasonal cold and remain active year-round [2].

Army Ant Biology

Aenictus concavus belongs to the true army ants (subfamily Dorylinae). Like other army ants, they likely live in large colonies with multiple queens and maintain a nomadic lifestyle, moving frequently to new hunting grounds and forming temporary bivouacs rather than permanent nests [2]. They probably specialize in raiding other social insect colonies, particularly termites and other ants, though specific prey preferences for this species remain unstudied.

Frequently Asked Questions

Can I keep Aenictus concavus in captivity?

No, this species cannot currently be kept in captivity. Only workers have been documented, and no queens are known to science. Without a queen, you cannot establish a colony. Additionally, army ants require specialized care including massive foraging spaces and enormous quantities of live prey that make them unsuitable for home ant keeping.

How do I start an Aenictus concavus colony?

You cannot start a colony because queens have never been documented for this species. Army ants also reproduce by colony fission (splitting existing colonies) rather than by single queens founding new nests, so even if you found a queen, you would need an existing colony to split.

What do Aenictus concavus ants eat?

Specific diet is unknown, but as army ants they likely prey on other social insects such as termites, ant brood, and other small arthropods. They would require large amounts of live prey daily.

How big do Aenictus concavus colonies get?

Colony size is unknown for this specific species, but related Aenictus species maintain colonies with thousands of workers. Exact numbers remain unstudied.

What temperature do Aenictus concavus need?

As a tropical species from lowland Thailand and Vietnam, they likely need warm stable temperatures around 24-28°C. They do not tolerate cold conditions.

Do Aenictus concavus need hibernation or diapause?

No, they are a tropical species and remain active year-round. They do not require cooling or hibernation periods.

Why are no queens known for Aenictus concavus?

Army ant queens (called dichthadiiform queens) are wingless and rarely collected because they remain deep within the colony's bivouac. Most army ant species are known only from worker specimens. The queens may also be extremely similar to workers or hidden in soil during collections.

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References

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