Pheidole colaensis

Pheidole colaensis

Pheidole colaensis is a small ant species endemic to Fiji, belonging to the roosevelti group. Majors are 5.78-7.06mm with a distinctive shiny appearance and reduced sculpture, they're the only species in their group where the major's posterolateral lobes are completely smooth and free of sculpturing ^[1]. Minors are much smaller at 3.34-3.90mm and workers are entirely smooth and shining except for weak carinae below the eyes ^[1]. Queens are notably small at 6.44-6.77mm with reduced mesosomas ^[1]. This species is restricted to high elevation ranges of Viti Levu (800m-1300m) where it's locally abundant, often nesting alongside roads and in forest clearings ^[2]. The most striking feature is their nesting behavior, they build distinctive turret entrances made of soil pellets rising 3-5cm above ground, leading to chambers over one meter deep that contain hundreds or thousands of workers ^[2][1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Fiji, specifically Viti Levu island at high elevations (800m-1300m). Found in tropical forest clearings and along roadsides, often in damp areas. The species is locally abundant where it occurs and is restricted to just a few high elevation ranges ^[2][1].
• Colony Type: Likely polygynous, multiple dealate (wingless) queens have been recovered from nest excavations, suggesting the species forms colonies with multiple reproductive queens ^[1][2]. This is unusual among Pheidole species which are typically single-queen.
  • Colony: Polygyne
• Size & Growth:
  • Queen: 6.44-6.77mm ^[1]
  • Worker: Minors: 3.34-3.90mm, Majors: 5.78-7.06mm ^[1]
  • Colony: Many hundreds to thousands of workers per colony ^[2]
  • Growth: Moderate, estimated based on typical Pheidole development patterns
  • Development: Estimated 6-8 weeks at optimal temperature based on genus-level data for Pheidole species (No specific development data available for this species. Related Pheidole species typically develop from egg to worker in 6-8 weeks at warm temperatures.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a high-elevation tropical species, they prefer warm but not extreme heat. Room temperature (around 24-26°C) is ideal. Avoid temperatures above 32°C.
  • Humidity: Moderate to high, being from damp tropical highlands, they prefer humidity around 60-80%. Keep the nest substrate consistently moist but not waterlogged. Provide a water tube as a moisture source.
  • Diapause: No, being from tropical Fiji with year-round warm temperatures, they do not require hibernation or winter dormancy.
  • Nesting: This species nests deep in soil with chambers over 1 meter deep. In captivity, they need a spacious nest with deep chambers or a naturalistic setup with substantial substrate depth (at least 10-15cm). A Y-tong or plaster nest works well, or a naturalistic terrarium with soil. They build distinctive turret-like nest entrances in the wild ^[2].
• Behavior: Minors are active foragers that search the leaf litter some distance from their nest ^[2]. Majors are scarce and timid, they rarely leave the nest and are not aggressive defenders ^[2]. Workers are not particularly aggressive and the colony is relatively peaceful. Escape risk is moderate, minors at 3-4mm can squeeze through small gaps but are not as tiny as some Pheidole species. Use standard barrier methods. They are seed collectors and will also forage for small insects.
• Common Issues: deep nesting requirement means they need spacious setups, shallow nests will limit colony growth, polygynous structure means multiple queens may be present, do not remove extra queens unless fighting occurs, high elevation origin means they may not tolerate prolonged heat above 30°C, colonies can reach thousands of workers requiring large enclosures, wild-caught colonies may be difficult to establish due to stress from collection and transport

Housing and Nest Setup

Pheidole colaensis requires deeper nesting space than many common ant species. In the wild, their nests extend over one meter deep with multiple chambers ^[2]. For captive colonies, use a Y-tong nest with deep chambers, a plaster nest with substantial depth, or a naturalistic terrarium setup with at least 10-15cm of soil substrate. They build distinctive turret entrances in the wild (3-5cm soil pellet towers), so a naturalistic setup allows them to exhibit more natural behaviors. A test tube setup works for founding colonies but be prepared to move them to a larger setup once the colony reaches 20-30 workers. Provide a water tube for humidity and ensure the nest can maintain moisture without flooding.

Feeding and Diet

Like other Pheidole species, P. colaensis is opportunistic and will collect both seeds and small insects. Minors actively forage in leaf litter in the wild ^[2], so they likely scavenge for protein sources. Feed a mix of small seeds (millet, sesame, chia) and protein sources like small mealworms, fruit flies, or other tiny insects. Sugar water or honey can be offered occasionally but protein should form the bulk of their diet. Feed every 2-3 days for established colonies, removing uneaten food within 24 hours to prevent mold. A varied diet helps promote healthy colony growth.

Temperature and Humidity

As a high-elevation tropical species from Fiji (800-1300m), P. colaensis prefers warm but moderate temperatures, aim for 24-28°C. They likely experience cooler temperatures than lowland Fiji ants due to their elevation. Avoid prolonged temperatures above 32°C or below 20°C. For humidity, maintain 60-80%, keep the nest substrate consistently damp but not waterlogged. A water tube connected to the nest provides a steady moisture source. Mist the outworld occasionally but avoid creating standing water. Good ventilation helps prevent mold while maintaining humidity. ^[1][2]

Colony Structure and Social Organization

This is one of the more unusual aspects of P. colaensis, it's likely polygynous, meaning colonies have multiple queens ^[1][2]. Multiple dealate queens have been found in nest excavations, suggesting they remain in the colony after mating rather than being expelled. This is relatively rare among Pheidole which are typically single-queen species. When keeping this species, you may encounter multiple queens in your colony. Do not automatically remove extra queens unless they are fighting, in polygynous species, multiple queens can coexist peacefully. Colonies can grow very large, reaching many hundreds to thousands of workers ^[2], so be prepared for substantial growth and eventual need for larger housing.

Behavior and Temperament

P. colaensis has a distinctive temperament, minor workers are active foragers that search the leaf litter some distance from their nest, while major workers are scarce and timid, rarely leaving the nest ^[2]. Unlike some Pheidole species with aggressive majors, these ants are relatively peaceful. Majors serve more as reserves and are not aggressive defenders. Workers are not particularly defensive and rarely bite. The colony is best described as docile. Activity levels are moderate, you'll see regular foraging activity from minors but not the frantic pace of some tropical species. They are primarily diurnal foragers.

Seasonal Care

Being from tropical Fiji with year-round warm temperatures, P. colaensis does not require hibernation or a diapause period. Maintain consistent temperatures year-round. The high elevation habitat (800-1300m) may experience slightly cooler conditions than lowland Fiji, but temperatures remain warm throughout the year. No special winter preparations are needed, just maintain normal care routines. However, avoid placing the colony near air conditioning vents or cold drafts in winter. ^[1][2]

Frequently Asked Questions

References