Pheidole subnuda

Quick Summary

• Difficulty: Unknown – likely Medium based on genus patterns
• Origin & Habitat: Colombia (Meta) and Venezuela (Táchira state) at 1100–1200 m elevation in the Andes – likely highland tropical or subtropical habitats ^[2][3][1].
• Colony Type: Unknown. No data on queen number. Most Pheidole are monogyne, but polygynous species exist. Captive observations are needed.
• Size & Growth:
  • Queen: Undocumented – no queen specimens have been described.
  • Worker: ~2–4 mm total length (inferred from Pheidole genus, direct total length measurements are unavailable). Head width data: major HW 0.94 mm, minor HW 0.58 mm ^[3].
  • Colony: Unknown – no colony size data exists.
  • Growth: Unknown – no development data exists.
  • Development: Unknown – based on typical Pheidole patterns, estimate 6–10 weeks at optimal temperature. This is a rough guess, not a confirmed timeline. (No species-specific research exists. Use this estimate with caution.)
• Antkeeping:
  • Temperature: Likely 22–26 °C based on highland Neotropical origin ^[1]. Start at 24 °C and adjust based on colony activity.
  • Humidity: Keep nest substrate slightly moist but not waterlogged. Small worker size makes them susceptible to desiccation, ensure a humid nest area.
  • Diapause: Unknown – tropical origin suggests no true hibernation, but reduced activity may occur during cooler months. Observe seasonal patterns.
  • Nesting: No natural nesting data. Based on Pheidole genus, likely nests in soil or under stones. Use test tubes or small formicaria with narrow passages (due to tiny workers).
• Behavior: Completely unstudied. Pheidole species are generally non‑aggressive foragers that scavenge for protein and sugar. Major workers (soldiers) assist in defense and food processing. The very small size of both castes (under ~4 mm body length) requires excellent escape prevention – use fine mesh (
• Common Issues: no biological data exists – this species has never been kept in captivity, unknown founding behavior – claustral or semi‑claustral? No queen observations, tiny workers can escape through standard barriers – use very fine mesh (≤0.5 mm), inferred temperature and humidity needs may be wrong – monitor closely, wild‑caught colonies may carry parasites since nothing is known about their health

Species Overview and Identification

Pheidole subnuda was described in 2003 by Wilson from specimens collected in Colombia and Venezuela ^[1]. It belongs to the diligens group. Major workers have a smooth gaster, faint longitudinal carinulae on the posterior half of the head, a weakly bilobed pronotum, and a hairless mesosoma ^[3]. Minor workers have a concave ventral head profile, a completely smooth head and gaster, and an opaque, pitted waist ^[3]. The species name 'subnuda' means 'almost bare', referring to the reduced pilosity ^[1]. Only a handful of specimens exist from three highland locations (1100–1200 m) in Venezuela and one site in Meta, Colombia ^[2][3][1].

Natural History and Biology

Almost nothing is known about the biology of this species. The only documented observation is the presence of males in a nest at La Parada, Venezuela on 13 September, suggesting nuptial flights might occur during the wet season ^[1]. No data exists on colony size, queen behavior, founding method, diet, or any other trait. This species has never been kept in captivity. Any care advice is highly speculative and based on genus‑level patterns, not species‑specific research.

Housing and Nesting

Since no natural nesting data exists, infer from related Pheidole and collection locations. The highland tropical origin suggests warm, humid conditions. In captivity, start with test tubes as founding chambers, for established colonies, use small formicaria with narrow passages (due to tiny workers). The very small size of minors (body length ~2–4 mm) requires fine mesh (≤0.5 mm) on outworlds to prevent escape. Avoid large open spaces that small ants may dry out in. A small outworld with a heat gradient allows observation and feeding.

Feeding and Diet

No direct dietary data exists. Like most Pheidole, this species is likely omnivorous, accepting both protein (small insects like fruit flies, pinhead crickets, mealworm pieces) and sugar (honey, sugar water). Pheidole species are scavengers rather than active predators. Offer protein 2–3 times per week and constant access to sugar water. Remove uneaten prey after 24–48 hours to prevent mold. Major workers may help process larger items, but minors handle fine particles.

Temperature and Seasonal Care

Collected from highland sites (1100–1200 m) in the Venezuelan Andes – likely prefers slightly cooler conditions than lowland tropical species. Start at 22–26 °C ^[1]. Monitor activity: if workers cluster near heat, raise temperature, if they avoid heat, lower it. Since the region is near the equator with year‑round warmth, true hibernation is unlikely. You may see reduced activity during cooler months, but no diapause data exists. Maintain consistent temperatures and humidity throughout the year.

Behavior and Colony Dynamics

No behavioral studies exist for this species. Based on typical Pheidole, expect non‑aggressive foragers with distinct major and minor worker castes. Majors defend and process food, minors forage and care for brood. The species likely forms moderate‑sized colonies with one queen (unconfirmed). Workers will probably recruit nestmates to food sources. The small size (both castes under ~4 mm) makes them vulnerable to desiccation – maintain high nest humidity.

Frequently Asked Questions

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References