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

Neivamyrmex pauxillus

Non-Parasitic Queen No Gamergate
Sci. Name
Neivamyrmex pauxillus
Subfamily
Dorylinae
Author
Wheeler, 1903
Distribution
Found in 2 countries
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Introduction

Neivamyrmex pauxillus is a tiny army ant from the southern US and northern Mexico. Workers measure 1.75-2 mm and are reddish-yellow all over. They have no eyes at all - completely blind and navigate using chemicals . Their mandibles have a prominent basal tooth, and they have the classic army ant body with a distinct constriction between the meso- and epinotum. This is one of several small, yellow Neivamyrmex species that are rarely seen because they live entirely underground . What stands out about N. pauxillus is how little we know about them despite being a North American species. They are confirmed subterranean predators, likely hunting other ants or termites underground . They move in small troops under stones, and researchers have found them using underground baiting. For antkeepers, this species is a real challenge - a cryptic predator that spends most of its life hidden.

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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: Southern United States (Louisiana, Texas) and northern Mexico (Hidalgo, Tamaulipas, Morelos, Veracruz). Lives underground, often under stones in soil [3][2][4][5].
  • Colony Type: Colony structure is unconfirmed. As a Neivamyrmex army ant, they likely have temporary colony structures similar to other army ants, but this has not been studied.
  • Size & Growth:
    • Queen: Unknown, queen described by Watkins (1971) but no measurements available [1]. Likely slightly larger than workers.
    • Worker: 1.75-2 mm [1]
    • Colony: Unknown, likely smaller colonies given their tiny size and cryptic habits.
    • Growth: Unknown
    • Development: Unknown, no development data exists for this species. Related army ant species suggest several months, but this is speculative. (Development has not been studied. Estimates based on other Neivamyrmex are speculative.)
  • Antkeeping:
    • Temperature: Unknown, no thermal studies exist. Based on their range (Texas, Louisiana, northern Mexico), they likely tolerate 15-30°C. Start at room temperature (20-24°C) and watch colony activity.
    • Humidity: Subterranean species likely need high humidity. Keep the nest substrate consistently moist but not waterlogged. Think damp underground conditions.
    • Diapause: Unknown, no seasonal data exists. Their range has mild winters, so they may have reduced activity periods rather than true hibernation.
    • Nesting: Fully subterranean. They need a dark, humid environment with access to soil or a moist substrate. A test tube setup with soil or a plaster nest with high humidity would be most appropriate. Keep in darkness since they have no eyes.
  • Behavior: These are blind, subterranean predatory ants. They likely raid in small groups to hunt other ant colonies or termites [2]. They have no eyes and navigate through chemical signals. Workers are very small (1.75-2 mm), so escape prevention is critical despite their subterranean nature, they can squeeze through tiny gaps. Temperament is likely aggressive toward other ants but harmless to humans. Their small size and lack of eyes make them completely safe.
  • Common Issues: completely unknown care requirements means trial and error is required, subterranean lifestyle makes observing colony behavior difficult, no confirmed food preferences, must experiment with prey items, escape prevention needed despite small size, they can fit through tiny gaps, very rare in the antkeeping hobby so no established husbandry methods exist

Why Neivamyrmex pauxillus Is So Challenging

This species is one of the most difficult antkeeping challenges in North America. Unlike common ant species with extensive care guides, N. pauxillus has barely been studied in the wild, let alone in captivity. The entire scientific literature is just a handful of specimen descriptions and distribution records. No one has documented their colony structure, founding behavior, diet, or development timeline. What we know: they are tiny (1.75-2 mm), blind, subterranean, and predatory. That's it. Everything else, how to keep them alive, what to feed them, how they reproduce, is unknown. This is not for beginners or even intermediate keepers. It's for advanced hobbyists who enjoy pioneering new methods. [2][1]

Housing and Nest Setup

Because they live entirely underground, these ants need a dark, humid environment. They have no functional eyes, so light exposure likely causes stress. Use a setup with minimal light access, a naturalistic tank with a dark cover or a test tube inside a dark container. Keep the substrate consistently moist but not waterlogged. Given their tiny size (1.75-2 mm), any gaps must be extremely small, they can fit through gaps that seem impossible. A small plaster nest or a test tube with moist cotton could work. The key is high humidity and escape prevention. Keep them in darkness as much as possible. Some keepers have located Neivamyrmex by underground baiting, placing small prey in buried containers [2]. This suggests they will investigate prey in their tunnels.

Feeding and Diet - The Big Unknown

This is the biggest mystery. They are confirmed subterranean predators [2], likely hunting other ants or termites. No one knows what they eat in captivity. As army ants (Dorylinae), they likely raid other colonies for brood, or hunt termites. For captive feeding, experiment with very small live prey: springtails, fruit fly larvae, or tiny mealworms. Their workers are only 1.75-2 mm, so prey must be extremely small. Sugar sources are unlikely, army ants are mainly predatory. Start with live micro-prey and observe. Do not expect established feeding schedules to work, this requires trial and error.

Understanding Their Biology

Neivamyrmex pauxillus was first described by William Morton Wheeler in 1903 from nine specimens collected under a stone in Texas [1]. This is still the typical way to find them, turning stones in their habitat. They have never been collected in large numbers, suggesting their colonies are small or foragers few. They are completely blind (no eyes) and navigate chemically, like all army ants. Their mandibles have a prominent basal tooth for seizing prey. The queen was described by Watkins in 1971,but her size and behavior are not well documented [1]. Their distribution covers Louisiana and Texas in the US and central Mexico, suggesting they prefer warm climates but can handle cooler winters.

Frequently Asked Questions

Is Neivamyrmex pauxillus a good species for beginners?

No. This is an expert-level species. Almost nothing is known about their care, no one has documented what they eat, how they reproduce, or what conditions they need. They are subterranean, blind, and extremely rare in the hobby. Only experienced keepers who enjoy pioneering new husbandry methods should try this species.

What do Neivamyrmex pauxillus ants eat?

They are confirmed subterranean predators, likely hunting other ants or termites [2]. In captivity, experiment with very small live prey, springtails, fruit fly larvae, or tiny mealworms. Their workers are only 1.75-2 mm, so prey must be extremely small. They almost certainly will not accept sugar water or honey. This is speculative, no one has kept this species long-term to confirm diet.

How big do Neivamyrmex pauxillus colonies get?

Unknown. No one has documented colony size for this species. Their tiny worker size (1.75-2 mm) and cryptic subterranean lifestyle suggest smaller colonies than typical army ants, but this is purely speculative.

Can I keep Neivamyrmex pauxillus in a test tube?

A test tube setup with moist cotton could work, but they need high humidity and complete darkness. The key challenge is escape prevention despite their tiny 1.75-2 mm size, they can squeeze through very small gaps. Any test tube setup must have excellent barriers. They are subterranean, so they may do better in a setup with soil or a moist substrate they can tunnel through.

Do Neivamyrmex pauxillus need hibernation?

Unknown. Their range includes Texas, Louisiana, and northern Mexico, areas with mild winters. They may have reduced activity during cooler months rather than true hibernation. No seasonal data exists for this species.

Where can I find Neivamyrmex pauxillus in the wild?

They are found in Louisiana and Texas (USA), and in central Mexico (Hidalgo, Tamaulipas, Morelos, Veracruz). They are subterranean and rarely encountered. The best method is underground baiting, burying small containers with prey to attract foraging workers [2]. They have been found under stones, so turning stones in appropriate habitat may also work.

How do Neivamyrmex pauxillus queens found colonies?

Unconfirmed. Founding behavior has not been documented for this species. Most Neivamyrmex are army ants and likely have temporary parasitic founding like other Dorylinae, but this is unconfirmed. The queen was described in 1971 but her behavior is unknown.

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References

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This caresheet is licensed under CC BY-SA 4.0 .