Scientific illustration of Tatuidris tatusia (Armadillo ant) - showing key identification features including head, thorax, and gaster.

Armadillo ant

Tatuidris tatusia

Non-Parasitic Queen No Gamergate
Sci. Name
Tatuidris tatusia
Tribe
Agroecomyrmecini
Subfamily
Agroecomyrmecinae
Author
Brown & Kempf, 1968
Common Name
Armadillo ant
Distribution
Found in 10 countries
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Introduction

Tatuidris tatusia is one of the rarest and most unusual ants in the world - it's the only species in its genus and one of just two living species in the subfamily Agroecomyrmecinae . Worker total length can reach about 3.4 mm, but body length (excluding appendages) is 0.45-0.89 mm . They are easily recognized by their shield-shaped head,7-segmented antennae, and thick, rigid reddish-brown integument that gives them a rounded, armadillo-like appearance . The most striking feature is their enormous sting relative to body size, which they can deploy rapidly downward and forward . These ants are nocturnal sit-and-wait predators that move very slowly and often remain motionless for minutes when disturbed . Despite being top predators in the leaf-litter food web (confirmed by stable isotope analysis showing δ15N = 9.64), they have never been successfully fed in captivity - refusing every food item offered including live prey, sugar, and protein sources .

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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: Neotropical forests from northern Mexico to central Brazil and Peru, typically at 800-1200 m elevation in pre-montane mountain zones [3][5]. Found almost exclusively in leaf litter of humid tropical forests [4].
  • Colony Type: Small colonies observed (3 workers + 4 gynes in one field collection), but colony structure (single-queen vs multi-queen) is unconfirmed [5].
  • Size & Growth:
    • Queen: Queen head width 1.28 mm and body length (Weber's length) 1.53 mm [3].
    • Worker: Worker total length approximately 3.42 mm, body length (Weber's length) 0.45-0.89 mm [2][3].
    • Colony: Very small, only a few workers observed in field collections [5].
    • Growth: Unknown, development timeline has not been documented.
    • Development: Unknown, development has not been studied in this species. (No data available on egg-to-worker development time.)

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References

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This caresheet is licensed under CC BY-SA 4.0 .