Polyrhachis salomo

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Solomon Islands (Makira, Guadalcanal, Malaita, Russell Islands, Bougainville) – tropical Pacific islands with high humidity and warm temperatures year-round ^[3][4].
• Colony Type: Polydomous – a single colony maintains multiple connected nests ^[2][5]. The number of queens per colony has not been documented, so colony structure (monogyne vs polygyne) is unknown.
• Size & Growth:
  • Queen: 9mm ^[1]
  • Worker: 6.3-6.5mm ^[1]
  • Colony: Unknown – not documented in scientific literature
  • Growth: Unknown – no direct data available
  • Development: Unknown – species-specific data not available (Development is likely temperature-dependent, but no reliable estimates exist for this species.)
• Antkeeping:
  • Temperature: No precise data, as a tropical species from the Solomon Islands, temperatures around 24-28°C are likely appropriate. Use a heating cable on one side of the nest to create a gradient. Avoid drops below 22°C for extended periods.
  • Humidity: High humidity is expected given the tropical rainforest habitat. Keep the nest substrate consistently moist but not waterlogged. Provide a water tube for drinking and evaporation. Ensure good ventilation to prevent mold.
  • Diapause: No – as a tropical species, they do not require winter hibernation. Keep temperatures stable year-round.
  • Nesting: Lignicolous (wood-nesting) and subterranean. In captivity, use Y-tong (AAC), plaster, or naturalistic setups with rotting wood pieces and soil. Because they use silk to bind nest materials, provide loose substrate (e.g., a sand-soil mix) or small wood pieces that they can work with ^[2][5]. They are polydomous, so set up multiple connected chambers or allow room for expansion.
• Behavior: Polyrhachis ants are generally calm and not aggressive toward keepers. Their defense mechanism is formic acid spray – they bite and spray acid into the wound (typical of Formicinae). They do not have a sting. Workers are active foragers and moderately sized (6mm), so standard escape prevention (Fluon on test tube rims, tight lids) is adequate. Their polydomous nature means they may occupy several nest areas within the enclosure.
• Common Issues: high humidity needs can cause mold if ventilation is poor – balance moisture with airflow, tropical species may slow down or stress if temperatures drop below 22°C, polydomous colonies need ample space for multiple nest sites – provide enough room, wild-caught colonies may carry parasites or diseases, quarantine before adding to a setup, silk use may lead to messy nest modifications – accept or provide suitable materials

Housing and Nest Preferences

P. salomo nests in rotting wood and in soil ^[2][5]. In captivity, you can use Y-tong (AAC) nests, plaster nests, or naturalistic habitats with rotting wood pieces and soil. Because they are polydomous (use multiple nests), consider providing a setup with several connected chambers or space for expansion. They use silk to bind nest materials together ^[5], so adding loose substrate (e.g., a mix of sand and soil) or small pieces of wood gives them something to work with. Keep the nest area humid but include some drier spots so the ants can regulate their own conditions. Avoid acrylic nests – recommend only Y-tong, plaster, soil, or 3D-printed nests.

Temperature and Heating

No species-specific temperature data exists. As a tropical ant from the Solomon Islands, you should aim for warm conditions – likely 24-28°C. Use a heating cable on ONE side of the nest (not underneath, to avoid drying the substrate) to create a gradient. Monitor with a thermometer. Avoid long periods below 22°C, as this may slow development or stress the colony.

Feeding and Diet

There is no species-specific dietary study. Based on the Polyrhachis genus, these ants are generalist omnivores. Offer sugar water, honey, or sucrose solution constantly. For protein, provide small insects like fruit flies, small crickets, or mealworms 2-3 times per week, removing leftovers after 24 hours. Always supply fresh water – a water tube with a cotton wick works well. They likely also forage for honeydew and plant secretions in nature.

Humidity and Water

These tropical ants need high humidity. Keep the nest substrate consistently damp (like squeezed-out sponge) but not waterlogged. A water tube attached to the nest provides drinking water and helps raise humidity through evaporation. Mist the outworld occasionally, but don't overdo it – balance moisture with good ventilation to prevent mold. Provide a gradient: a moist nest area and a drier outworld.

Colony Structure and Growth

P. salomo is polydomous – a single colony maintains multiple connected nests ^[2][5]. The number of queens (monogyne vs polygyne) is unknown. Workers are 6.3-6.5mm and queens 9mm ^[1]. They have pupal cocoons ^[2]. Colony growth rate and size are unstudied, expect a slow-to-moderate expansion typical of Polyrhachis, but no reliable data exists.

Behavior and Temperament

Polyrhachis species are generally calm and not aggressive. Workers are active foragers and not particularly territorial. Their defense is formic acid spray (typical of Formicinae) – they can bite and spray acid, but it poses no danger to humans. They do not have a sting. Because workers are about 6mm, use standard escape prevention (Fluon on test tube rims, tight-fitting lids). They are day-active and will explore their outworld. Their use of silk in nest construction is a unique behavior you may observe if you provide suitable materials ^[5].

Frequently Asked Questions

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References