Carebara colobopsis

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Only known from Siem Reap Province, Cambodia, in lowland dry evergreen forest leaf litter at 13°43'47"N, 104°02'38"E ^[1][2]. This is a tropical forest environment with warm temperatures and moderate humidity.
• Colony Type: Unknown. Only a handful of specimens have ever been collected, the type series consists of 2 major workers and 4 minor workers ^[1]. No queen or colony structure data exists. The genus Carebara typically forms small to moderate colonies, but colony size for this species is unconfirmed.
• Size & Growth:
  • Queen: Unknown, no queens have been collected or described ^[1].
  • Worker: Major workers: approximately 2mm total length. Minor workers: approximately 1mm total length. These are among the smallest ants in the genus Carebara ^[1].
  • Colony: Unknown, only 6 worker specimens known from the type series ^[1].
  • Growth: Unknown, no colony development data exists for this species.
  • Development: Unknown. No development data exists for this newly described species. (No development data exists for this newly described species.)
• Antkeeping:
  • Temperature: Estimate 24-28°C based on Cambodia's tropical climate. Avoid temperatures below 20°C or above 32°C.
  • Humidity: Moderate, they come from leaf litter in a dry evergreen forest. Keep substrate moist but not waterlogged.
  • Diapause: Unlikely. As a tropical species from Cambodia, they probably do not require a hibernation period ^[1]. However, this is unconfirmed as their seasonal behavior has never been studied.
  • Nesting: In nature they live in leaf litter. In captivity, a small test tube setup or miniature formicarium with moist substrate works well. The tiny size of both castes means chambers must be appropriately scaled.
• Behavior: Behavior is unstudied. Based on genus patterns, they are likely cryptic leaf-litter ants that nest in decaying wood or soil. The phragmotic major workers likely use their truncated heads to block nest entrances, similar to how soldiers function in other phragmotic species. Escape prevention is critical due to their very small size, use fine mesh and tight-fitting barriers. Stinging capability is unknown but likely minimal given their tiny size.
• Common Issues: this species is extremely rare in the hobby, availability is virtually nil., no captive breeding data exists, making successful keeping highly uncertain., very small size means escape prevention must be excellent., lack of any care information means keepers are essentially pioneering husbandry.

The Unique Phragmotic Head

The most remarkable feature of Carebara colobopsis is the major worker's truncated, phragmotic head. Unlike typical ants where the head is rounded or rectangular, the major worker's anterior surface is flat and cut off, this is the first confirmed record of this morphology in the entire genus Carebara ^[1]. The species name 'colobopsis' references this resemblance to the genus Colobopsis, which is famous for its soldier ants that use their plug-like heads to block nest entrances ^[1]. The major workers also have distinctive horn-like teeth at the posterolateral corners of the head ^[1]. This phragmosis uses the clypeus and mandibles differently than other Carebara species that have phragmotic forms, which use the cranium, clypeus, and mandibles together ^[1]. The function of this morphology in C. colobopsis likely serves as a defensive adaptation, blocking the nest entrance from intruders.

Size and Morphology

This is a tiny ant species with significant size difference between castes. Major workers measure approximately 2mm total length, while minor workers are much smaller at approximately 1mm total length ^[1]. Both castes have 9-segmented antennae, which is unusual in the genus Carebara where 11 segments is more typical ^[1]. Major workers are yellowish ferruginous in color, while minor workers are yellow ^[1]. The minor workers have distinctive features including a deep metanotal groove, propodeal spines, and lamellae (thin ridges) along the propodeal declivity and the ventral surface of the petiole ^[1].

Distribution and Habitat

Carebara colobopsis is known only from its type locality in Siem Reap Province, Cambodia, at coordinates 13°43'47"N, 104°02'38"E ^[1]. It has never been found anywhere else in the world ^[1]. The specimens were collected from leaf litter in a lowland dry evergreen forest in December 2012 ^[1]. This habitat type in Cambodia features warm temperatures year-round and moderate humidity. The species was collected alongside other leaf-litter ants, suggesting it lives cryptically within the forest floor debris rather than in obvious nests.

Keeping an Extremely Rare Species

Carebara colobopsis represents one of the rarest and most recently described ant species in the hobby. First described in 2022, only 6 worker specimens exist in museum collections, the type series of 2 majors and 4 minors ^[1]. There is no established captive population, and virtually no information exists about their care requirements. This species would be considered an expert-level challenge suitable only for experienced antkeepers who can work with unknown parameters. If you obtain this species, you would essentially be pioneering all husbandry methods. The best approach would be to provide conditions similar to other Carebara species: a small test tube setup with moist substrate, temperatures around 24-28°C, and feeding small protein sources like fruit flies or springtails. However, success with this species would be unprecedented.

Frequently Asked Questions

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References