Polyrhachis bohemia

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Arid and semi-arid regions of northern tropical Australia, particularly the Kimberley region in Western Australia, including Bohemia Downs and Mitchell Falls area ^[1][3].
• Colony Type: Colony structure is unconfirmed. Only worker and queen castes are described, but queen number and social structure are not documented in available research.
• Size & Growth:
  • Queen: 7.96 mm ^[1]
  • Worker: 6.65-7.56 mm ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Estimated 6-10 weeks at optimal temperature, based on Polyrhachis genus patterns (Development is temperature-dependent, warmer conditions may speed up growth.)
• Antkeeping:
  • Temperature: Based on their tropical distribution, keep them warm around 24-28°C ^[3]. Avoid temperatures below 20°C.
  • Humidity: Keep nest substrate moderately dry to slightly moist, reflecting their arid to semi-arid natural habitat. Provide a humidity gradient with some dry areas.
  • Diapause: Unknown, as a tropical species, they likely do not require hibernation, but this is unconfirmed. Monitor colony activity and adjust care seasonally.
  • Nesting: Ground-nesting species ^[1]. Provide a naturalistic setup with deep soil (at least 5-10 cm) or a Y-tong/plaster nest designed for ground-nesting ants, connected to an outworld for foraging.
• Behavior: Polyrhachis ants are generally less aggressive and are considered subordinate in their ecosystem ^[3]. They lack a functional sting and spray formic acid for defense, which is typical for Formicinae ants. Escape risk is moderate due to their medium size, use standard barrier methods.
• Common Issues: stress from collection and transport can cause establishment failures in wild-caught colonies., incorrect nest setup (e.g., insufficient depth for ground-nesting) can prevent colony development., low temperatures or incorrect humidity can lead to colony decline.

Appearance and Identification

Polyrhachis bohemia is easily recognized by its two-tone coloration: bright brick-red head and mesosoma contrasted with a darker chocolate-brown gaster ^[1][2]. Workers measure 6.65-7.56 mm, and queens are slightly larger at 7.96 mm ^[1]. They have characteristic spines on the propodeum and petiole, and convex eyes that break the head outline.

Natural Distribution and Habitat

This species is endemic to northern tropical Australia, specifically arid and semi-arid regions like the Kimberley ^[1]. It has been recorded at Bohemia Downs and Mitchell Falls, often at laterite or sandstone sites ^[3]. Despite a wide distribution, it is rare, with only two individuals found in one survey ^[3].

Nesting Behavior

Like most Hagiomyrma species, Polyrhachis bohemia is a ground-nester, digging colonies in soil ^[1][4]. In captivity, provide a deep substrate layer or a suitable plaster nest, connected to an outworld for foraging. Given their arid habitat, keep the nest substrate moderately dry with some moist areas.

Feeding and Diet

As Formicinae ants, they are omnivorous. Offer sugar water or honey for energy, and protein sources like small insects (e.g., fruit flies, mealworms). Feed protein 2-3 times per week with constant sugar access. Remove uneaten prey to prevent mold.

Temperature and Seasonal Care

Keep temperatures around 24-28°C based on their tropical distribution ^[3]. Use a heating mat to create a gradient. Diapause is unconfirmed, reduce activity during cooler periods but avoid cold temperatures below 18-20°C.

Challenges and Considerations

This species is rare in the wild, making colonies hard to acquire ^[3]. Limited captive breeding data means care is often inferred. Ground-nesting requires specific setup, and wild-caught colonies may be stressed from collection.

Frequently Asked Questions

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References