Polyrhachis parabiotica

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Philippines (Negros and Luzon islands), found in dead tree fern fronds at 1,500-4,000 feet altitude in forested areas ^[1][2]
• Colony Type: Colony structure is unconfirmed, only one wild colony has ever been documented
• Size & Growth:
  • Queen: Approximately 6.9 mm in total length ^[1]
  • Worker: 6.0-6.3 mm in total length ^[1]
  • Colony: Unknown, only one colony has ever been found
  • Growth: Unknown
  • Development: Unconfirmed, no captive breeding data exists (Development timeline is unstudied. Related Polyrhachis species typically develop in 6-10 weeks at tropical temperatures, but this is a rough estimate.)
• Antkeeping:
  • Temperature: Unknown, based on tropical origin, aim for warm conditions around 24-28°C ^[1]
  • Humidity: Unknown, likely moderate to high humidity given arboreal nesting in tropical forests ^[1]
  • Diapause: No, tropical species do not require hibernation ^[1]
  • Nesting: Lignicolous (wood-nesting), use Y-tong, plaster, or naturalistic setups with wood pieces ^[2]. The single known colony was in a dead tree fern frond ^[1].
• Behavior: This species is diurnal, only collected during daytime surveys ^[3]. Temperament is unstudied, but most Polyrhachis species are moderately defensive. They have pupal cocoons ^[2][4], which is unusual for Formicinae. Escape risk is moderate due to 6 mm worker size, standard barriers should suffice, but avoid tiny gaps.
• Common Issues: extreme rarity, this species is virtually unavailable in the antkeeping hobby and has never been captive-bred, completely unstudied biology, all care recommendations are educated guesses based on related species, the single known colony was found in a parabiosis relationship with Myrmicaria, their exact ecological needs are unknown, no established feeding protocols exist, their diet in captivity is completely unverified, potential difficulty establishing in captivity, wild-caught colonies may struggle with captive conditions

Rarity and Collection History

Polyrhachis parabiotica is one of the rarest ant species in the world, only a single colony has ever been documented. Chapman collected workers and wingless females from forays of Myrmicaria ants on Cuernos de Negros for many years before finding the nest in 1948. The colony was in a dead tree fern frond, with the fern partly surrounded by a Myrmicaria mound nest. This association is reflected in the species name 'parabiotica, ' meaning 'living alongside.' Workers and females closely resemble Myrmicaria in coloration ^[1].

Nesting Biology

This species is lignicolous, meaning it nests in wood. The only known colony was in a dead tree fern frond ^[1]. Like other Polyrhachis in subgenus Myrma, they use silk to construct nests and have pupal cocoons ^[2][4]. In captivity, a naturalistic setup with wood pieces or a Y-tong formicarium would replicate their natural conditions.

Distribution and Habitat

Polyrhachis parabiotica is endemic to the Philippines, known from Negros and Luzon islands. On Negros, specimens are orange-red, on Luzon, they are red ^[1]. They are collected at elevations between 1,500 and 4,000 feet in forested areas, indicating a preference for cooler, humid conditions ^[1].

Care Recommendations

Since this species has never been captive-bred, all care recommendations are based on related Polyrhachis species. Provide warm temperatures around 24-28°C and moderate to high humidity. Use a lignicolous nest like Y-tong or naturalistic setups with wood pieces. Feed sugar water and insects, though acceptance is unverified. This species is only for expert antkeepers ^[1][2].

Frequently Asked Questions

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References