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

Pheidole diabolus

Monogynous Non-Parasitic Queen No Gamergate
Sci. Name
Pheidole diabolus
Tribe
Attini
Subfamily
Myrmicinae
Author
Wilson, 2003
Distribution
Found in 2 countries
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Introduction

Pheidole diabolus is a Neotropical ant species with dramatic major workers that have a sharp, upcurved horn on their clypeus, giving them a devil-like appearance. The species is found in Costa Rica and Colombia's Chocó region, nesting in rotten wood on the forest floor, and a seed cache was documented in the type colony . The most striking feature is the major workers' horn, which makes them visually unique among ants.

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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: Tropical rainforests of Costa Rica and Colombia's Chocó region, nesting in rotten wood on the ground [1][2][3].
  • Colony Type: Colony structure is unconfirmed, but based on Pheidole patterns, likely monogyne (single queen) [1].
  • Size & Growth:
    • Queen: Size data unavailable, no queen measurements in literature [3]
    • Worker: Size data unavailable, full body length measurements are not provided in the research [3]
    • Colony: Estimated up to several hundred workers based on related Pheidole species [1]
    • Growth: Moderate, inferred from tropical Pheidole species
    • Development: Estimated 5-8 weeks at tropical temperatures (24-28°C) based on genus patterns [1] (Tropical species develop faster than temperate ants. First workers may be smaller than normal.)
  • Antkeeping:
    • Temperature: Keep warm around 24-28°C, based on tropical habitat [1]
    • Humidity: Keep substrate consistently moist but not waterlogged, with a humidity gradient [1]
    • Diapause: No, tropical species do not require hibernation [1]
    • Nesting: Use naturalistic setups with soil and rotting wood, or Y-tong/plaster nests with moisture chambers [1]
  • Behavior: Major workers have a sting for defense but are not aggressive toward keepers. Minor workers handle daily tasks. Escape risk is moderate due to small size of minors.
  • Common Issues: tropical species needs constant warmth, cold temperatures below 20°C can slow brood development, high humidity requirements mean mold can be an issue if ventilation is poor, seed-harvesting behavior may lead to ignoring protein, offer insects regularly, wild-caught colonies may harbor parasites that can harm the colony in captivity, founding phase may take months before first workers emerge

Housing and Nest Setup

You can use naturalistic setups that mimic their forest-floor habitat. Provide a mix of soil and rotting wood as substrate, or use a Y-tong or plaster nest with moisture chambers. The nest should have small chambers suitable for minor workers. Keep the environment humid but not waterlogged, and place the nest in a warm area [1].

Feeding and Diet

You should offer a variety of seeds like grass seeds or millet, along with protein sources such as small insects. The type colony had a seed cache, confirming their seed-harvesting behavior [1]. Feed every 2-3 days and remove uneaten food to prevent mold.

Temperature and Seasonal Care

Keep the nest area warm at 24-28°C year-round, as this species is tropical. Use a heating cable to create a gradient. Do not let temperatures drop below 20°C for long periods, as it can slow development [1].

Behavior and Colony Structure

Major workers have a distinctive upcurved horn and prominent humeri, and they can sting if threatened, but they are not aggressive toward keepers. Minor workers handle most tasks. Colonies grow slowly at first during founding, then accelerate [1][3].

Frequently Asked Questions

How long does it take for Pheidole diabolus to produce first workers?

Expect about 5-8 weeks from egg to first worker at tropical temperatures, based on genus patterns [1]. The founding phase can take several months, so patience is needed.

What do Pheidole diabolus ants eat?

They are omnivorous seed harvesters. Offer small seeds and protein sources like insects. Protein is essential for colony growth [1].

Do Pheidole diabolus ants need hibernation?

No, as a tropical species, they do not require hibernation. Keep them warm year-round [1].

What size colony does Pheidole diabolus reach?

The maximum colony size is unknown, but based on related species, it may reach several hundred workers [1].

Are Pheidole diabolus good for beginners?

They are rated as medium difficulty due to the need for constant warm and humid conditions. Experienced keepers may have success [1].

What makes Pheidole diabolus major workers special?

Their majors have a unique upcurved horn on the clypeus, giving them a devil-like appearance, which is why the species is named 'diabolus' [1][3].

Can I keep multiple Pheidole diabolus queens together?

This has not been documented. Most Pheidole are monogyne, and combining queens may lead to fighting. It is not recommended.

What nest type is best for Pheidole diabolus?

A naturalistic setup with soil and rotting wood works well, or Y-tong/plaster nests with moisture chambers. Maintain high humidity [1].

Where is Pheidole diabolus found in the wild?

They are native to Costa Rica and Colombia's Chocó region, nesting in rotten wood on the forest floor [1][2][3].

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References

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This caresheet is licensed under CC BY-SA 4.0 .