Camponotus inquilinus

Camponotus inquilinus

Camponotus inquilinus is an extremely rare Southeast Asian ant species discovered only in Brunei on the island of Borneo. This species belongs to the subgenus Myrmamblys and is part of the inquiline group, ants that live within the nests of other ant species. Minor workers have a distinctive bicolored appearance: reddish-brown head and mesosoma contrasting with a black gaster. Major workers have a characteristic yellowish clay-colored head. Both castes feature long white standing hairs across their dorsal surface [AntWiki].

What makes C. inquilinus truly remarkable is its mimetic relationship with Colobopsis cylindrica group ants (the famous "exploding ants"). This species has evolved to closely resemble its host in size, color, and body shape, a remarkable example of ant mimicry. Researchers found minor workers living directly within Colobopsis nests, suggesting a parabiotic or inquiline lifestyle where they coexist alongside host colonies rather than being true parasites ^[1].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Only known from Brunei Darussalam on the island of Borneo, specifically the Kuala Belalong Field Studies Centre in the Temburong district. This is a tropical rainforest environment where the species lives in close association with Colobopsis cylindrica group ants [AntWiki].
• Colony Type: Inquiline species, lives within nests of Colobopsis cylindrica group ants. Both pure colonies and mixed colonies with hosts have been documented. The colony structure (single-queen vs multi-queen) remains unconfirmed due to the species' rarity [AntWiki].
• Size & Growth:
  • Queen:{.size-link} ~6-7 mm, inferred from Camponotus genus [AntWiki]
  • Worker:{.size-link} ~4-6 mm, inferred from Camponotus genus [AntWiki]
  • Colony: Unknown, only known from a few specimens in artificial nests [AntWiki]
  • Growth: Unknown
  • Development: Unknown, no development data exists for this newly described species (Development timeline has not been studied.)
• Antkeeping:
  • Temperature: Keep at warm tropical temperatures around 24-28°C. This matches the hot, humid conditions of Brunei's rainforests where the species naturally occurs [AntWiki].
  • Humidity: Requires high humidity, think damp rainforest floor. Keep nest substrate consistently moist but not waterlogged. Provide a water tube for drinking access [AntWiki].
  • Diapause: No, as a tropical species from Borneo, they do not require hibernation. Maintain warm conditions year-round [AntWiki].
  • Nesting: In nature, this species lives within the nests of Colobopsis cylindrica group ants. In captivity, providing a naturalistic setup with narrow chambers similar to the wooden stake cavities they were found in would be appropriate. Y-tong nests with tight chambers work well. The key challenge is that they may require proximity to or association with host ant colonies to thrive [AntWiki].
• Behavior: This is an extremely docile, non-aggressive species. As an inquiline ant, they have evolved to live peacefully alongside host colonies rather than compete with them. Workers are slow-moving and not particularly defensive. Escape risk is moderate, they are small ants but not as tiny as some other species. Standard escape prevention with fine mesh barriers is recommended. The species is primarily arboreal/nesting in wood, so they may not venture far from their nest [AntWiki].
• Common Issues: this species is extremely rare in the antkeeping hobby, finding a colony for sale is nearly impossible, the inquiline lifestyle means this species may require host ant association to survive long-term, no captive breeding data exists, colonies may be wild-caught only, tropical temperature requirements mean no temperature drops or seasonal changes, the species has only been scientifically described in 2018, so biological data is extremely limited

Discovery and Rarity

Camponotus inquilinus was only formally described in 2018 by Zettel and Laciny, making it one of the newest ant species to science. The entire known distribution consists of a tiny area around the Kuala Belalong Field Studies Centre in Brunei, Borneo. All specimens have been collected from artificial wooden nest boxes, essentially wooden stakes with drilled cavities that researchers placed to study local ant populations. This species has never been found in natural nesting situations, which tells us very little about how they establish colonies in the wild. The species name "inquilinus" literally means "tenant" or "lodger" in Latin, referencing its suspected lifestyle of living within host ant nests [AntWiki].

The Inquiline Lifestyle

C. inquilinus represents a fascinating case of ant social parasitism. Unlike typical ants that build their own nests, this species has evolved to live within the nests of Colobopsis cylindrica group ants, the famous "exploding ants" known for their defensive strategy of rupturing their own bodies to release toxic secretions. Researchers found a single minor worker of C. inquilinus living peacefully among Colobopsis workers in the same nest, suggesting they either live alongside hosts as parabiotic partners or are mild social parasites that the host colony tolerates. This relationship is why the ant has evolved such remarkable mimicry, looking exactly like the host species likely helps them avoid detection and aggression from host workers ^[1][AntWiki].

Mimicry and Morphology

The most striking feature of C. inquilinus is its extraordinary resemblance to Colobopsis cylindrica group ants. Major workers have evolved a very stout, squared head with dense punctures that looks remarkably similar to the head structure of Colobopsis majors. Both minor and major workers match their hosts in size and coloration, the reddish-brown head and mesosoma with black gaster is nearly identical to the Colobopsis species they associate with. This mimicry extends to having large eyes and wide scapes (antenna segments), features that help them blend in with host workers. The minor workers even have the domed head shape typical of Colobopsis, though C. inquilinus can be distinguished under magnification by differences in hair length and integument structure ^[1][AntWiki].

Housing and Captive Care

Given the species' extreme rarity and specialized biology, C. inquilinus should only be kept by highly experienced antkeepers who understand inquiline species requirements. Provide a warm, humid setup around 24-28°C with consistent moisture. A naturalistic setup with wooden elements or a Y-tong nest with narrow chambers mimics the wooden stake cavities they were discovered in. The critical question for long-term success is whether they require host ant association, this remains unknown but is suspected based on their natural history. If keeping them, consider housing them in a setup that allows for potential host ant introduction, though this is experimental territory. Feed standard ant fare: sugar water or honey for energy, and protein sources like mealworms or crickets. Standard escape prevention is adequate for their size [AntWiki].

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