Dolichoderus affinis

Dolichoderus affinis

Dolichoderus affinis is a medium-sized dolichoderine ant native to South and Southeast Asia, ranging from India through Myanmar, Thailand, Malaysia, Indonesia, and the Philippines to southern China ^[1][2]. Workers measure 3.5-4mm with a distinctive reddish-brown to dark brown coloration, lighter on the mandibles, antennae, and legs ^[3][4]. The head is shining and finely punctate, the thorax is distinctly punctured and sculptured, and the abdomen is smooth and convex ^[4]. This species is notable for its polygynous colony structure, multiple queens live together in the same nest, and its close relationship with sap-sucking insects like mealybugs, aphids, and membracids, which the ants tend for honeydew ^[1]. They nest in hollow dead tree branches, bamboo internodes, and under loose bark ^[5].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Tropical and subtropical Asia, found across the Indomalaya region (India, Myanmar, Thailand, Malaysia, Indonesia, Philippines, Vietnam, Laos, Nepal, Brunei, Singapore) and into southern China ^[1][2][6]. Inhabits lowland dipterocarp forests, disturbed habitats, and forest edges. Nests in hollow dead tree branches, bamboo internodes, and under loose bark ^[1][5].
• Colony Type: Polygynous, multiple queens live together in the same colony ^[1]. Queens have been observed orienting towards light ^[5].
  • Colony: Polygyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Unconfirmed, no direct measurements found in available research
  • Worker: 3.5-4mm ^[3][4]
  • Colony: Likely several hundred to over 1000 workers based on typical Dolichoderus colony sizes and polygynous structure
  • Growth: Moderate, estimated based on tropical Dolichoderus patterns
  • Development: 6-10 weeks (estimated based on typical Dolichoderus development at tropical temperatures) (Development time is estimated from related Dolichoderus species, actual timeline may vary)
• Antkeeping:
  • Temperature: Keep at 24-28°C, they are a tropical species adapted to warm, humid conditions ^[7]. Room temperature within this range works well. A slight heat gradient can be provided but is not essential.
  • Humidity: High humidity, aim for 70-85%. These ants naturally inhabit damp tropical forests. Keep the nest substrate consistently moist but not waterlogged. Provide a water tube for drinking water.
  • Diapause: No, as a tropical species, they do not require hibernation. Activity may slow slightly during cooler months but no formal diapause period is needed.
  • Nesting: Prefers naturalistic setups that mimic their natural nesting sites, hollow branches, bamboo, or under loose bark ^[1][5]. Y-tong (AAC) nests or plaster nests with narrow chambers work well. They do well in formicariums with good humidity retention.
• Behavior: Generally calm and non-aggressive compared to many ant species. They are opportunistic foragers and are most active during post-monsoon and winter seasons in their native range ^[8]. Workers tend sap-sucking insects (mealybugs, aphids, membracids) for honeydew, this is a key part of their diet ^[1]. They do not have a painful sting. Escape risk is moderate, use standard barrier methods.
• Common Issues: tropical humidity requirements mean mold can develop if ventilation is poor, balance humidity with adequate airflow, polygynous colonies may have queen competition or aggression during founding, monitor closely if combining queens, honeydew dependence means sugar sources are important, ensure constant access to sugar water or honey, slow colony growth in the first few months can lead to overfeeding by impatient keepers, wild-caught colonies may carry parasites that can devastate captive colonies

Nest Preferences

In the wild, Dolichoderus affinis nests in hollow dead tree branches, bamboo internodes, and underneath loose bark ^[1][5]. They prefer dark, humid microhabitats within their tropical forest environment. For captive care, Y-tong (AAC) nests or plaster nests work well, both retain humidity while providing dark chambers that mimic their natural nesting sites. Avoid dry, airy setups. The nest should have chambers narrow enough that workers can touch the ceiling, as these ants feel more secure in snug spaces. A water tube connected to a cotton reservoir helps maintain humidity.

Feeding and Diet

This species has a strong trophobiotic relationship with sap-sucking insects, they actively tend mealybugs (pseudococcids), aphids, and membracids for honeydew ^[1]. In captivity, sugar water or honey should be available at all times, this is their primary energy source. They also accept protein sources like small insects (fruit flies, small mealworms, crickets). Feed protein 2-3 times per week, and keep sugar water constantly available. Unlike some ants, they are not aggressive predators, their foraging is opportunistic and centered around honeydew collection.

Temperature and Care

As a tropical species from South and Southeast Asia, Dolichoderus affinis requires warm temperatures, aim for 24-28°C ^[7]. Room temperature within this range is usually sufficient. They do not require hibernation or diapause, though activity may slow slightly during cooler periods. High humidity is essential, target 70-85% relative humidity. Keep the nest substrate consistently moist but not flooded. Poor humidity leads to worker mortality and colony decline. These ants are sensitive to temperature drops, so avoid placing the colony near air conditioning vents or cold windows.

Behavior and Temperament

Dolichoderus affinis is a relatively calm, non-aggressive species compared to many ants. Workers are medium-sized at 3.5-4mm and move with a characteristic steady pace ^[3][4]. They are most active during post-monsoon and winter seasons in their native range ^[8]. The species is known for its mutualistic relationships with sap-sucking insects, workers will tend and protect mealybugs, aphids, and membracids to harvest honeydew ^[1]. They do not possess a painful sting. Colonies are polygynous, meaning multiple queens coexist, which can lead to some initial aggression when combining unrelated queens, monitor closely during introductions.

Colony Structure

This is one of the few truly polygynous Dolichoderus species, multiple reproductive queens live together in the same colony ^[1]. This is different from species where a queen dies and is replaced, here, multiple queens actively reproduce together. Colonies can grow quite large given their polygynous structure. Queens have been observed orienting towards light, which may help them find suitable nesting sites after nuptial flights ^[5]. The presence of multiple queens means colony founding can be pleometrotic (multiple queens starting a nest together), though this has not been directly documented for this species.

Frequently Asked Questions

References