Calyptomyrmex danum

Quick Summary

• Difficulty: Expert, this is a rarely kept species with no established care guidelines.
• Origin & Habitat: Danum Valley, eastern Sabah, Malaysia (Borneo). Collected from a single rainforest site. Nests in rotten wood or in soil ^[1][3][2].
• Colony Type: Unconfirmed. Only a small number of specimens have been collected, and colony structure has not been studied.
• Size & Growth:
  • Queen: Unknown, a single queen was collected but measurements were not published separately ^[1].
  • Worker: Head width about 1mm, total body length has not been documented ^[1]. The species is very small.
  • Colony: Unknown, no data on wild colony sizes exists ^[3].
  • Growth: Unknown
  • Development: Unknown, no development studies exist. By inference from similar small Myrmicinae, possibly 6-10 weeks at optimal temperature, but this is unconfirmed. (No direct data on development time exists for this species.)
• Antkeeping:
  • Temperature: Tropical rainforest ant: keep at 24-28°C. Avoid below 22°C. No specific data, inferred from habitat ^[3].
  • Humidity: High humidity essential. Keep nest substrate consistently moist but not waterlogged. Rainforest species need around 70-85% humidity.
  • Diapause: No, as a tropical species from Borneo, diapause is not required. Maintain stable conditions year-round.
  • Nesting: Natural nests are in rotten wood or soil ^[3]. Use a naturalistic setup with moist substrate, such as a dirt-filled formicarium or test tube with soil. Ensure chambers are small due to their tiny size.
• Behavior: Workers forage singly or in small numbers rather than in large trails ^[3]. They rely on camouflage, often covering themselves with soil ^[3]. They are likely non-aggressive and cryptic. Being very small, escape prevention is critical, use fine mesh barriers. Like other Crematogastrini, they have a modified stinger for smearing venom rather than typical stinging (general knowledge).
• Common Issues: tiny size makes escapes likely without fine mesh barriers and careful sealing., no established care guidelines, you will need to experiment with conditions., high humidity requirements can lead to mold if ventilation is inadequate., limited availability and unknown colony growth may lead to frustration., very little is known about their diet, feeding may be trial-and-error.

Appearance and Identification

Calyptomyrmex danum workers are very small ants with a dull red-brown color. Their most notable feature is the spatulate hairs, these are hairs narrower near the body and expanded with a rounded tip ^[1]. These hairs help them collect and hold soil particles for camouflage ^[3]. The propodeum has short angular teeth, and the petiole is slightly broader than long and oval-shaped when viewed from above ^[1]. The gaster is smooth to shallowly punctate ^[1]. These features separate them from other Calyptomyrmex species.

Natural History and Habitat

This species is known only from the Danum Valley in eastern Sabah, Malaysia (Borneo). It was collected several times at a single rainforest site between July and November 1999,and was described in 2011 ^[1]. It nests in rotten wood or directly in soil ^[3]. Workers often have a layer of soil stuck to their spatulate hairs, which acts as camouflage ^[3]. They forage singly or in small numbers through the leaf litter ^[3].

Housing and Nesting

Mimic their natural rainforest floor habitat. Use a formicarium with moist soil substrate or a test tube setup containing soil. Nests must be kept consistently moist but not waterlogged ^[3]. Because of their tiny size, all connections must be sealed with fine mesh, these ants can squeeze through very small gaps. A small outworld is enough since they forage singly or in small groups. Provide a water source (e.g., a test tube with a cotton plug) for drinking. Keep the setup dark and stable, away from vibrations.

Feeding and Diet

No direct feeding observations exist for this species. Based on related Calyptomyrmex and their small size, they likely take tiny arthropods, honeydew, and other small organic matter. Offer small protein sources like fruit flies, pinhead crickets, and other tiny insects. Try diluted honey or sugar water. Feed small amounts first and see what they accept. Remove uneaten food after 24-48 hours to prevent mold in the humid environment.

Temperature and Humidity Requirements

Calyptomyrmex danum is a tropical rainforest species from Borneo, so keep conditions warm and humid. Aim for 24-28°C. Avoid temperatures below 22°C. Using a gentle heating cable on one side can create a gradient, but make sure the nest doesn't dry out. Humidity needs to be high, the substrate should feel consistently moist. Good ventilation is necessary to prevent mold, but airflow should not dry out the nest.

Challenges and Considerations

This is an experimental species with no established care guidelines. You will be pioneering husbandry methods. Expect slow progress, small colonies of cryptic ants often grow slowly. Their tiny size makes them vulnerable to drowning in water tubes and escaping through small gaps. If you get a colony, keep careful notes for the community. This species is best for experienced keepers who enjoy the challenge and can provide stable, humid conditions.

Frequently Asked Questions

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References