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

Pristomyrmex costatus

Non-Parasitic Queen No Gamergate
Sci. Name
Pristomyrmex costatus
Tribe
Crematogastrini
Subfamily
Myrmicinae
Author
Wang, 2003
Distribution
Found in 1 countries
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Introduction

Pristomyrmex costatus is a small ant species native to Southeast Asia, found in Borneo, Indonesia, Malaysia, the Philippines, and Singapore . Workers measure 4.1-4.6 mm in total length and have a reddish-brown coloration with coarse rugoreticulate sculpture on the head and alitrunk . They have long pronotal spines that are longer than propodeal spines, and lack erect hairs on the first gastral tergite . Queens are larger at 5.2-5.3 mm and lack pronotal spines . This species nests in rotting logs, leaf litter, and under bark in lowland rainforest and swamp forest habitats .

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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: Medium
  • Origin & Habitat: Southeast Asia, found in Borneo, Indonesia, Malaysia, Philippines, and Singapore in lowland rainforest, swamp forest, and primary forest habitats [1][2]. They nest in rotting logs, under bark, and in leaf litter [2].
  • Colony Type: Colony structure is unconfirmed for Pristomyrmex costatus [2].
  • Size & Growth:
    • Queen: 5.2-5.3 mm [1]
    • Worker: 4.1-4.6 mm [1]
    • Colony: Unknown, based on related species, colonies may reach several hundred workers.
    • Growth: Unknown, likely moderate based on typical Myrmicinae development.
    • Development: 6-10 weeks at optimal temperature. (Development timeline is unconfirmed for this species.)
  • Antkeeping:
    • Temperature: Keep at 22-26°C, these are lowland tropical ants that prefer warm, stable conditions[2].
    • Humidity: Keep the nest substrate consistently moist but not waterlogged, as they naturally live in damp environments [2].
    • Diapause: No, as a tropical species, they do not require hibernation [1][2].
    • Nesting: They naturally nest in rotting wood and leaf litter. In captivity, they do well in Y-tong (AAC) nests, plaster nests, or naturalistic setups with damp substrate [2].
  • Behavior: Pristomyrmex ants are generally calm and non-aggressive. As Myrmicinae, they have a stinger used for smearing venom onto enemies, but they are not known to be defensive. Their small size means escape prevention is critical, use fine mesh and tight-fitting barriers[2].
  • Common Issues: escape prevention is critical due to their small size, they can squeeze through standard gaps., tropical humidity requirements can lead to mold issues if ventilation is poor., limited available information means care is based on genus-level patterns rather than species-specific research., wild-caught colonies may carry parasites or pathogens that can cause colony failure.

Housing and Nest Setup

Pristomyrmex costatus does well in several nest types. Y-tong (AAC) nests work well because they provide dark, enclosed spaces. Plaster nests or naturalistic setups with damp substrate also suit them. They naturally nest in rotting wood and leaf litter, so provide hiding places like cork bark or small pieces of wood. Maintain high humidity with adequate ventilation to prevent mold. Foraging space should be modest for these small ants. Use a test tube setup for founding colonies, then transition to a formicarium once the colony reaches 20-30 workers. [2]

Feeding and Diet

Like most Myrmicinae, Pristomyrmex costatus is omnivorous. They likely consume small insects and honeydew in the wild. In captivity, offer small live prey like fruit flies or pinhead crickets, and sugar sources like honey water. Feed protein 2-3 times per week and keep sugar available constantly. Remove uneaten food to prevent mold. [2]

Temperature and Humidity Management

As a lowland tropical species, maintain temperatures between 22-26°C with a gentle gradient. Humidity should be high, keep the nest substrate moist but not waterlogged. Use a water reservoir or mist regularly, but ensure ventilation. [2]

Colony Development and Growth

Specific data is unconfirmed, but based on typical Myrmicinae, expect 6-10 weeks from egg to first worker at 24-26°C. The queen seals herself in and raises the first brood alone. Colonies grow slowly at first, then accelerate. Be patient during founding.

Behavior and Temperament

Pristomyrmex ants are peaceful and active foragers. They may bite if threatened but are not aggressive. Their small size makes them hard to see, but they can defend themselves. They adapt well to formicariums and forage readily. [2]

Seasonal Care and Overwintering

As a tropical species, no hibernation is needed. Maintain warm temperatures year-round. Avoid temperatures below 20°C. [1]

Frequently Asked Questions

How long does it take for Pristomyrmex costatus to get their first workers?

The exact timeline is unconfirmed, but based on typical Myrmicinae development, expect 6-10 weeks from egg to first worker at optimal temperature.

What do Pristomyrmex costatus ants eat?

They are omnivorous. Offer small live prey like fruit flies, small crickets, or mealworms as protein. Keep a sugar source available constantly, sugar water, honey, or commercial ant nectar works well.

Do Pristomyrmex costatus ants sting?

They are not known for stinging aggressively. As Myrmicinae, they have a stinger used for smearing venom, but they typically use it for subjugating prey rather than defense.

What temperature do Pristomyrmex costatus ants need?

Keep them at 22-26°C. These are lowland tropical ants from Southeast Asia that prefer warm, stable conditions. Avoid temperatures below 20°C or above 30°C.

Are Pristomyrmex costatus good for beginners?

They are rated as Medium difficulty. They require high humidity and warm temperatures, which can be challenging to maintain consistently. Their small size also demands good escape prevention. However, they are peaceful and not aggressive, which makes handling easier.

How big do Pristomyrmex costatus colonies get?

The maximum colony size is unknown for this specific species. Based on related Pristomyrmex species, colonies likely reach several hundred workers. They are not known for forming supercolonies, so expect moderate colony sizes.

Do Pristomyrmex costatus need hibernation?

No. As a tropical species from the Malay Peninsula, Borneo, and Philippines, they do not require hibernation or any cooling period. Maintain warm temperatures year-round and avoid letting the nest experience temperatures below 20°C.

Can I keep multiple Pristomyrmex costatus queens together?

The colony structure is unconfirmed for this species. The genus Pristomyrmex typically forms single-queen colonies, but polygyny has not been specifically documented for P. costatus. It is generally not recommended to combine unrelated foundresses, as fighting and colony failure are likely.

What humidity do Pristomyrmex costatus need?

Keep the nest substrate consistently moist but not waterlogged. These ants naturally live in rainforest environments with damp leaf litter and rotting wood. Poor humidity causes desiccation and colony failure.

When should I move Pristomyrmex costatus to a formicarium?

Wait until the colony has 20-30 workers before transitioning from a test tube setup to a formicarium. The founding queen can stay in a simple test tube until then. When moving, ensure the new nest has matching humidity levels and avoid disturbing the queen during the transition.

Why are my Pristomyrmex costatus dying?

Common causes include: low humidity, temperatures outside 22-26°C range, escape through tiny gaps due to their small size, mold from poor ventilation, or stress from disturbance during founding. Check these parameters first and adjust accordingly. Wild-caught colonies may also carry parasites.

What type of nest is best for Pristomyrmex costatus?

They do well in Y-tong (AAC) nests, plaster nests, or naturalistic setups with damp substrate. They naturally nest in rotting wood, so any setup that provides dark, enclosed spaces with high humidity works. Avoid dry setups or those with poor humidity retention.

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References

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