Polyrhachis dougcooki

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Hann Tableland, Queensland, Australia. A ground-nesting species found in tropical Australian habitats ^[1].
• Colony Type: Colony structure is unconfirmed, no data exists on whether they are single-queen (monogyne) or multi-queen (polygyne).
• Size & Growth:
  • Queen: ~10.68 mm ^[2]
  • Worker: 9.37-10.23 mm ^[1]
  • Colony: Unknown, no colony size data has been documented ^[1].
  • Growth: Unknown, growth rate has not been studied.
  • Development: Unconfirmed, no development data exists. Based on typical Polyrhachis patterns, expect 6-10 weeks at warm temperatures. (Development timeline is unconfirmed. Related Polyrhachis species typically take 6-10 weeks from egg to worker at optimal temperatures.)
• Antkeeping:
  • Temperature: Unknown, no specific data. As a tropical species, keep warm, roughly 24-28°C, but monitor colony activity.
  • Humidity: Unknown, no specific data. Keep nest substrate slightly moist but not waterlogged, as it is a ground-nesting species ^[1].
  • Diapause: Unknown, no data on overwintering. As a tropical species, likely no diapause required.
  • Nesting: Ground-nesting species ^[1]. Use soil or Y-tong/plaster nests with chambers scaled to their large size.
• Behavior: Polyrhachis ants are generally active foragers. Workers are defensive and can spray formic acid when threatened, as typical for Formicinae. They are excellent climbers and escape artists, use excellent escape prevention regardless of behavior. Being large ants, they are quite visible.
• Common Issues: biology is almost entirely unknown, care recommendations are based on genus-level patterns rather than species-specific data, no documented colony size means growth expectations are uncertain, development timeline is unconfirmed, keepers should monitor brood development and adjust conditions accordingly, tropical species may be sensitive to temperature drops, maintain warm conditions, escape prevention is essential given their large size and active foraging

Appearance and Identification

Polyrhachis dougcooki workers are large ants measuring 9.37-10.23 mm ^[1]. They are entirely black with a dense covering of golden pubescence. The pilosity is distinctly longer than in related species, and the golden pubescence covers the whole body including the head ^[1]. They have relatively long antennal scapes (SI 168-173) compared to the similar P. ammon (SI 145-155) ^[1]. Queens are slightly larger at around 10.68 mm and very similar in appearance to workers, with dark reddish-brown mandibles ^[2]. The species has distinctive spines on the propodeum and petiole, typical of the genus.

Natural History and Distribution

This species is known only from the Hann Tableland in Queensland, Australia ^[1]. It is a ground-nesting species, meaning it naturally nests in soil ^[1]. The type specimens were collected in December 1995. Males and immature stages have not been documented in the scientific literature. The biology of this species remains essentially unknown, we do not have data on colony size, nuptial flight timing, diet, or founding behavior ^[1].

Housing and Nesting

Since P. dougcooki is a ground-nesting species ^[1], provide a nest setup with soil or suitable substrate. A Y-tong or plaster nest with appropriately sized chambers works well for these large ants. During the founding stage, a standard test tube setup can work, but provide some soil or substrate once the colony establishes. Ensure the nest has chambers large enough for the queen and brood to move freely. Being tropical ants from Queensland, they will likely do best in a warm, humid setup with some ventilation to prevent mold.

Feeding and Diet

The specific diet of P. dougcooki has not been documented. Like most Polyrhachis species, they likely forage for honeydew from aphids and scale insects, and supplement their diet with small insects and arthropods. In captivity, offer a varied diet including sugar water or honey as an energy source, and protein sources such as mealworms, crickets, or other small insects. Feed protein 2-3 times per week and provide constant access to sugar water. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

As a tropical species from northern Queensland, P. dougcooki requires warm conditions. Keep the nest at 24-28°C, but no specific data exists on optimal temperatures. A heating cable placed on part of the nest can help maintain warmth, but always provide a temperature gradient so ants can self-regulate. Monitor colony activity, if workers cluster near the heat source, increase temperature slightly, if they avoid it and seem sluggish, ensure temperatures are adequate. True diapause is likely not required, but the colony may show reduced activity during cooler periods.

Behavior and Temperament

Polyrhachis ants are known for their active foraging behavior and can be defensive when their nest is disturbed. Workers spray formic acid as a defense mechanism, typical for Formicinae. They are strong climbers and will explore their environment actively. While specific behavior data is lacking for this species, expect active, visible ants that will readily forage in the outworld. Use excellent escape prevention, despite their large size, they can squeeze through small gaps.

Frequently Asked Questions

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References