Crematogaster khmerensis

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Crematogaster khmerensis is known only from Kampong Thom Province in Cambodia, Southeast Asia. The type specimens were collected from an arboreal sample, indicating this is a tree-dwelling species ^[1][2].
• Colony Type: Colony structure is unconfirmed. Workers are presumably monomorphic (all the same size) ^[1].
• Size & Growth:
  • Queen: Unknown, queen caste has not been described ^[1]
  • Worker: Size data unavailable, the species is very small, inferred from Crematogaster genus as approximately 2-4mm
  • Colony: Unknown, no colony data exists ^[1]
  • Growth: Unknown, no development data exists
  • Development: Unknown, no development data exists for this species. (Development timeline is unconfirmed for this species.)
• Antkeeping:
  • Temperature: Since this species comes from Cambodia (tropical Southeast Asia), keep them warm at roughly 24-28°C. A gentle temperature gradient allows the colony to self-regulate.
  • Humidity: As an arboreal species from tropical Cambodia, they likely prefer moderate to high humidity. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: Unknown, no seasonal data exists. As a tropical species from Cambodia, they likely do not require hibernation.
  • Nesting: As an arboreal species, they will likely do best in setups that mimic elevated environments. Y-tong (AAC) nests or plaster nests work well. Provide climbing structures and vertical space.
• Behavior: Crematogaster ants are generally not aggressive toward keepers but will defend their nest vigorously. They have a characteristic habit of raising their abdomen when alarmed, this is a warning display rather than actual stinging, though some species can deliver mild stings. Their small size makes them quick and agile. Escape prevention is critical, these tiny ants can squeeze through remarkably small gaps. Use fine mesh and tight-fitting barriers. They are arboreal and will likely use vertical space more than ground-dwelling species.
• Common Issues: escape prevention is critical due to their very small size, they can slip through tiny gaps, almost no biological data exists, keepers are essentially pioneering care for this species, queen and male castes unknown means you cannot obtain a mated queen for captive breeding, wild-caught colonies may have parasites or diseases that are difficult to treat, this species is extremely rare in the hobby and may not be available

Discovery and Taxonomy

Crematogaster khmerensis was described in 2017 by Hosoishi and Ogata, making it one of the most recently described ant species. It was found in Cambodia's Kampong Thom Province and named after the Khmer Empire, the historical kingdom that once ruled that region ^[1]. The species belongs to the subgenus Crematogaster sensu stricto and is part of the khmerensis-group, which is distinguished by vertically directed propodeal spines and large propodeal spiracles that touch the metapleural gland bulla ^[1]. This species is nested within the Australo-Asian Crematogaster clade and is sister to a clade containing C. fruhstorferi and related species ^[1]. The common ancestor of C. khmerensis and its closest relatives began diverging approximately 15 million years ago during the Middle Miocene ^[1].

Identification and Morphology

This is a tiny ant species, workers are very small, brown-colored ants with several distinctive features. The propodeal spiracles are large and circular, positioned at the posterolateral corners and touching the metapleural gland bulla, this is a key identifying feature ^[1]. The propodeal spines are short and point vertically rather than backward ^[1]. The petiole is scoop-shaped and broader at the front than the back, with an undeveloped subpetiolar process ^[1]. Workers are presumably monomorphic, meaning all workers are the same size ^[1]. The queen and male castes have not been described and remain unknown to science ^[1].

Housing and Nest Setup

Since this is an arboreal species from tropical Cambodia, the setup should reflect its natural habitat. A Y-tong (AAC) nest or plaster nest works well, these provide humidity control and mimic the cavities these ants might use in trees. The small size of workers means chambers and passages should be appropriately scaled. Provide a water tube for humidity and a feeding area in the outworld. Because they are arboreal, include climbing structures like twigs, cork bark, or artificial plants in the outworld. Escape prevention is absolutely critical, these tiny ants can escape through very small gaps. Use fine mesh on all openings and apply barrier gel or fluon to tube connections.

Feeding and Diet

While specific diet data does not exist for C. khmerensis, Crematogaster ants are typically omnivorous and will accept both sugar and protein sources. Offer sugar water, honey, or diluted maple syrup as a constant carbohydrate source. For protein, provide small insects like fruit flies, pinhead crickets, or mealworms. As a tiny species, prey items should be appropriately sized. Some Crematogaster species also tend aphids for honeydew, so if you keep this species long-term, offering plant-based sugar sources may be beneficial. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Humidity

As a tropical species from Cambodia, C. khmerensis needs warm conditions. Aim for 24-28°C in the nest area, with a slight gradient if possible. A heating cable on one side of the nest can create this gradient. For humidity, target moderate to high levels, keep the nest substrate consistently moist but not waterlogged. As an arboreal species, they may not need as much humidity as ground-nesting ants, but some moisture is essential. A water tube attached to the nest provides a humidity reservoir.

Challenges and Considerations

Keeping Crematogaster khmerensis is genuinely an expert-level endeavor because so little is known about this species. The queen has never been described, meaning you cannot obtain a mated queen for captive breeding, any colonies in captivity would need to be wild-caught foundresses, which is extremely difficult. The entire world's scientific knowledge consists of four worker specimens from one location in Cambodia ^[1]. There is no data on colony size, development time, founding behavior, or any aspect of their biology. When keeping this species, you are essentially a pioneer. Document your observations carefully. Take notes on what foods they accept, how they respond to different temperatures and humidity levels, and any behaviors you observe. Your observations could contribute to our understanding of this species. This is not a species for beginners, start with more established Crematogaster species if you are new to the genus.

Frequently Asked Questions

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References