Pheidole aberrans

Pheidole aberrans

Pheidole aberrans is a small Neotropical ant belonging to the Myrmicinae subfamily, native to South America. Majors have a distinctive reddish-brown coloration with a uniquely shaped head featuring bilaterally symmetrical frontal lobes that come to a point. Workers are dimorphic: majors measure around 1.4mm head width with well-developed heads, while minors are smaller at around 0.68mm head width. The species belongs to the aberrans species group and is found across Argentina, Brazil, Bolivia, Peru, Paraguay, and French Guiana, typically nesting in open ground in areas like cactus scrub, overgrazed pasture, and roadsides^[1].

A notable feature of this species is that major workers have a thoracic crop, an auxiliary storage structure in the prothorax that allows them to function as repletes, storing liquids for the colony. Unlike many Pheidole species, majors are rarely recruited out of the nest for foraging, with minor workers handling most food collection ^[2]. This makes them an interesting species to observe as the division of labor between castes becomes apparent in captivity.

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to the Neotropical region, Argentina, Brazil, Bolivia, Peru, Paraguay, and French Guiana. Found in diverse habitats including cactus scrub, overgrazed pasture, residential backyards, roadsides, and vineyards. Nests are excavated in open ground with a single conspicuous entrance hole surrounded by excavated soil, leading to flat-bottomed chambers about 5cm across.
• Colony Type: Single-queen (monogyne) colonies based on typical Pheidole genus patterns. Colonies contain both major and minor workers, with majors serving as repletes for liquid food storage rather than regular foragers.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Unconfirmed in primary literature, estimated 6-8mm based on typical Pheidole queen size
  • Worker: Major: 1.40mm HW, Minor: 0.68mm HW
  • Colony: Estimated 500-2000 workers based on typical Pheidole colony sizes
  • Growth: Moderate, estimated based on genus patterns
  • Development: 6-8 weeks estimated based on typical Pheidole development at 24-26°C (Development time is estimated from related species, direct measurements for P. aberrans are not available)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This species is found in warm regions of South America and shows positive association with summer sampling. A heating cable on one side of the nest creates a suitable gradient.
  • Humidity: Keep nest substrate moderately moist. They naturally nest in soil chambers and prefer conditions that prevent complete drying. Provide a water tube as a constant moisture source.
  • Diapause: Unknown, no specific data on hibernation requirements. Based on their subtropical distribution, they may have reduced activity in cooler months but likely do not require true hibernation.
  • Nesting: Y-tong (AAC) nests work well for this species due to their small size. They naturally excavate in soil, so a plaster or naturalistic setup with soil substrate mimics their natural chambers. Use tight-fitting lids as minors can escape through small gaps.
• Behavior: This is a relatively calm species compared to some other Pheidole. Majors stay in the nest most of the time and serve as liquid food storage (repletes), while minor workers handle foraging. They are ground-dwelling and will readily explore the outworld for food. They show positive association with summer months and are known to associate with mealybugs in vineyards, tending them for honeydew. Escape prevention is important for the small minor workers.
• Common Issues: small minor workers can escape through standard test tube openings, use fine mesh barriers, colonies may be slow to establish in captivity due to limited major recruitment outside nest, overfeeding can lead to mold in the nest, remove uneaten food promptly, wild-caught colonies may have parasites that affect survival in captivity, lack of major workers foraging means food discovery may be slower, place food directly in the nest chamber initially

Housing and Nest Setup

Pheidole aberrans does well in Y-tong (AAC) nests or plaster nests that maintain humidity. Their natural nests consist of horizontal chambers about 5cm across connected by vertical galleries, so a nest with multiple connected chambers mimics this well. Use a test tube setup for founding colonies, transitioning to a formicarium once the colony reaches 30-50 workers. The species is small, minor workers are only about 0.68mm, so ensure all connections and barriers are tight. A water tube attached to the nest provides constant humidity. Place the nest in a quiet location away from direct sunlight and vibrations. ^[2][1]

Feeding and Diet

In the wild, this species associates with mealybugs in vineyards and collects honeydew, along with protein from small insects. In captivity, offer sugar water or honey water as a constant energy source. For protein, provide small insects like fruit flies, small crickets, or mealworm pieces. They are not aggressive foragers, so place food near the nest entrance initially until workers discover it. The unique thoracic crop in major workers means they can store significant amounts of liquid food, you may notice majors becoming engorged after sugar feeding. Minor workers do the majority of foraging, so ensure the outworld is accessible to them. ^[2]

Temperature and Seasonal Care

Keep the nest at 24-28°C for optimal colony development. This species is found in warm regions of South America and shows positive association with summer sampling in studies. A heating cable placed on one side of the nest creates a temperature gradient that allows ants to regulate their position. Room temperature in the low-to-mid 20s°C is often suitable. There is no specific data on diapause requirements, but based on their subtropical distribution, they likely maintain activity year-round with possibly reduced foraging in cooler months. If your room temperature drops below 20°C in winter, consider mild heating.

Colony Structure and Castes

Pheidole aberrans has dimorphic workers, majors and minors. The majors have a distinctive large head with bilaterally symmetrical frontal lobes and a thoracic crop that allows them to store liquids. This makes them function as repletes, similar to how honey ants store nectar. Interestingly, majors are rarely recruited out of the nest for foraging, the smaller minor workers handle most food collection and exploration. This division of labor means you may see fewer majors outside the nest, which is normal for this species. Colonies likely start with a single queen (monogyne) based on typical Pheidole patterns. ^[2][1]

Behavior and Observation

This is a rewarding species to observe because of the clear division of labor between castes. Minor workers actively explore the outworld and discover food, then recruit nestmates through chemical trails. When they return with liquid food, majors in the nest may engorge as they store the liquid in their thoracic crop. The species is ground-dwelling and prefers to nest in soil-like substrates. They are not particularly aggressive and can be housed in standard ant setups. Watch for their association with vineyards in the wild, they are known to tend mealybugs for honeydew, so sugar sources are definitely accepted. ^[2]

Frequently Asked Questions

References