Polyrhachis foreli

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Rainforest of northern Queensland, Australia and New Guinea, from Iron Range on Cape York Peninsula south to Mission Beach and Hinchinbrook Island, with disjunct Papuan populations on islands like Goodenough and Normanby ^[2].
• Colony Type: Based on Polyrhachis patterns, likely monogyne (single-queen colonies). Queens have been collected from Saibai Island, indicating established colonies ^[2].
• Size & Growth:
  • Queen: ~10.23-11.44 mm ^[1]
  • Worker: ~7.36-10.33 mm ^[1]
  • Colony: Unknown, no specific data on colony size
  • Growth: Moderate, inferred from genus patterns
  • Development: 6-10 weeks (inferred from related Polyrhachis species) (Pupal cocoons are present, typical for the genus ^[5]. Development time is inferred due to lack of species-specific data.)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly 24-28°C, as they are a tropical rainforest species ^[2].
  • Humidity: Keep nest substrate consistently moist but not waterlogged, with a humid outworld area, as they come from humid rainforest environments.
  • Diapause: No, tropical species do not require hibernation. Keep temperatures stable year-round.
  • Nesting: They naturally nest in rotting wood, tree stumps, and epiphytes. In captivity, use naturalistic setups with rotting wood or Y-tong/plaster nests. They are arboreal-nesting capable and may use silk to bind materials ^[6].
• Behavior: Generally calm and non-aggressive. Workers are active foragers but not defensive. They spray formic acid for defense. They tend sap-feeding insects for honeydew and may harvest food bodies from plants ^[7]. Workers can escape through small gaps due to their size, use standard barrier methods.
• Common Issues: high humidity is critical, drying out can kill colonies quickly, escape prevention needed, workers can fit through standard barrier gaps, tropical species cannot tolerate cool temperatures, keep above 24°C, slow colony growth may frustrate beginners, wild-caught colonies may have parasites affecting survival

Housing and Nest Setup

Polyrhachis foreli is a versatile nester that uses rotting logs, tree stumps, epiphytes, and ground cavities in the wild ^[2]. For captivity, a naturalistic setup with pieces of rotting wood works well. Alternatively, a Y-tong or plaster nest provides good humidity control. The nest must maintain high humidity with some ventilation to prevent mold. Place a water reservoir or moisture chamber connected to the nest area. The outworld should also have some humidity, and you can add live plants or moss. These ants can climb smooth surfaces, so apply fluon or barrier gel to the rim ^[6].

Feeding and Diet

Like other Polyrhachis in subgenus Myrma, P. foreli has a mutualistic relationship with Blochmannia bacteria that helps process nutrients from honeydew ^[3][4]. In captivity, offer sugar water or honey constantly. They also need protein, small insects like fruit flies or mealworms work well. They have been observed harvesting food bodies from Ryparosa kurrangii seedlings ^[7]. Feed protein 2-3 times per week and keep sugar water available. Remove uneaten prey after 24 hours.

Temperature and Humidity

As a tropical rainforest species from Queensland's wet tropics, P. foreli requires warm and humid conditions. Maintain temperatures between 24-28°C with minimal fluctuation ^[2]. Humidity should be high, keep the nest substrate consistently moist but not waterlogged. Mist the outworld occasionally and monitor for condensation. If the nest dries out, brood development may slow, excessive moisture without ventilation can cause mold.

Colony Development

Queens are claustral? Founding behavior is unconfirmed. Pupal cocoons are present, typical for the genus ^[5]. First workers may appear within 6-10 weeks under optimal conditions, but growth is moderate. Colony size is unknown. As the colony grows, provide more space in a larger formicarium.

Behavior and Temperament

Polyrhachis foreli is relatively calm. Workers are active foragers but not aggressive. They spray formic acid for defense, lacking a functional sting. Their spined morphology helps deter predators. Workers can live for several years, queens for over a decade with proper care. Standard escape prevention is sufficient due to their size.

Frequently Asked Questions

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References