Polyrhachis cyaniventris

Polyrhachis cyaniventris

Polyrhachis cyaniventris is a medium-sized ant from the Philippines, with a dark bluish metallic shimmer. Workers are 7.9-10.1 mm long, and queens are 9.4-10.9 mm long ^[1]. They belong to the subgenus Myrma and the Polyrhachis cyaniventris species group, characterized by numerous short black setae and longitudinal striation ^[1][2].

This species is arboreal, nesting in cavities in branches and foraging on leaves and twigs during the day ^[1]. Colonies are small, with up to 100 individuals and a single queen ^[1]. They are found in the Philippines on islands including Luzon, Catanduanes, Mindoro, Samar, Leyte, and Cebu ^[1][2][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Philippines (Central and Southern Luzon, Catanduanes, Mindoro, Samar, Leyte, Cebu). Inhabits degraded primary dipterocarp forests, secondary forests, and coconut groves with rich undergrowth in lowlands and low montane regions ^[1].
• Colony Type: Single-queen colonies (monogyne) with up to 100 workers per nest ^[1].
• Size & Growth:
  • Queen:{.size-link} ~9.4-10.9 mm ^[1]
  • Worker:{.size-link} ~7.9-10.1 mm ^[1]
  • Colony: Up to 100 workers ^[1]
  • Growth: Moderate
  • Development: Unknown, no species-specific data (Based on typical Polyrhachis patterns, development may take 6-10 weeks, but this is unconfirmed.)
• Antkeeping:
  • Temperature: Temperature needs are unclear, start around 24-28°C and observe, based on their tropical habitat ^[1].
  • Humidity: Keep nest substrate consistently moist but not waterlogged, as they inhabit forests with rich undergrowth ^[1].
  • Diapause: No, tropical species, no hibernation required ^[1].
  • Nesting: Arboreal nester in the wild, they occupy cavities in branches. In captivity, use Y-tong (AAC) or plaster nests with narrow chambers. Provide climbing structures like twigs ^[1].
• Behavior: Generally calm and non-aggressive. They lack a functional sting and spray formic acid for defense. Workers are diurnal foragers ^[4]. Escape risk is moderate due to medium size, standard prevention measures are recommended.
• Common Issues: tropical warmth requirements mean colonies can struggle in cool rooms, monitor temperatures closely., small colony size means slower growth and less buffer against mistakes, be patient during founding., arboreal nature means they need climbing structures, a flat test tube setup may not suit them., humidity needs are moderate to high, dry conditions can cause colony decline., limited availability in the antkeeping hobby means established colonies may be difficult to find.

Housing and Nest Setup

Polyrhachis cyaniventris is an arboreal species, nesting in cavities within branches in the wild. In captivity, use Y-tong (AAC) or plaster nests with narrow chambers to mimic tree holes. Add climbing structures like twigs to the outworld since they forage on vegetation ^[1]. Escape prevention is important, apply Fluon barriers to the nest rim ^[1].

Feeding and Diet

Diet is unconfirmed, offer sugar water or honey for energy, and protein sources like small crickets or fruit flies. Since they are diurnal foragers, provide food during daylight hours ^[1][4]. Remove uneaten protein after 24-48 hours to prevent mold.

Temperature and Humidity

As a tropical species, they require warm conditions. Keep the nest area warm, roughly 24-28°C, with a gradient if possible. For humidity, keep the nest substrate moist but not waterlogged, as they inhabit forests ^[1].

Colony Development and Growth

Colonies are small, with up to 100 workers ^[1]. Development time is unconfirmed, but based on typical Polyrhachis patterns, it may take 6-10 weeks from egg to worker. Founding queens likely seal themselves in, but specific founding behavior is unknown ^[1].

Behavior and Observation

These ants are diurnal and arboreal, making them interesting to watch as workers patrol leaves and twigs. They are generally calm, lack a sting, and spray formic acid for defense. Escape risk is moderate due to medium size ^[1][4].

Frequently Asked Questions

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References