Pheidole bison

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Bolivia and Argentina (Neotropical region). Collected from savanna habitat at 700m elevation in Noel Kempff Mercado National Park ^[1].
• Colony Type: Colony structure is unconfirmed. Based on typical Pheidole patterns, it may be monogyne, but no specific data exists.
• Size & Growth:
  • Queen: size data unavailable, inferred from Pheidole genus to be around 6-10 mm
  • Worker: size data unavailable, majors and minors are small, with majors having a distinctive hump
  • Colony: Unknown, no colony size data available. Based on genus patterns, colonies may reach up to thousands of workers.
  • Growth: Unknown, estimated moderate based on genus patterns.
  • Development: Unknown, estimated 6-10 weeks based on typical Pheidole development ^[1] (Development time depends on temperature, warmer conditions within the safe range speed up growth.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, inferred from tropical savanna origin ^[1].
  • Humidity: Moderate humidity around 50-70%, allow substrate to dry partially between waterings ^[1].
  • Diapause: No, inferred from tropical origin ^[1].
  • Nesting: Based on collection from termite nest and savanna habitat, they likely nest in soil or rotting wood ^[1].
• Behavior: Behavior is unstudied in captivity. Based on typical Pheidole patterns, majors serve defense and minors forage. Primary defense is stinging, as typical for Myrmicinae ants. Escape risk is moderate due to small size.
• Common Issues: temperature stress from too cold or too hot conditions, humidity imbalance causing mold or dehydration, disturbance during founding period if queen is disturbed, parasites or diseases from wild-caught colonies, escape due to small worker size

Species Identification and Morphology

Pheidole bison is a distinctive species within the tristis group ^[2], named for the bison-like hump on the major workers' promesonotum. Major workers have a dark reddish-brown head covered with longitudinal carinulae, except for the frontal triangle and central clypeus. Their promesonotum is massive and forms a convex dome that drops vertically to the metanotum. Minor workers are smaller and brownish-yellow, with foveolate surfaces and reduced propodeal spines appearing as small denticles. This species was described from Bolivia in 2003 and remains known only from that region ^[1].

Natural History and Habitat

Pheidole bison was collected from a termite nest in savanna habitat at 700m elevation in Bolivia's Santa Cruz department ^[1]. This association with termite nests may indicate a predatory relationship or opportunistic nesting in termite structures. The savanna environment suggests they prefer warmer, relatively drier conditions than rainforest-dwelling Pheidole species. Like other Neotropical Pheidole, they likely have generalist diets, consuming seeds, insects, and honeydew.

Housing and Nesting

Since specific nesting data does not exist for this species, housing recommendations are based on typical Pheidole husbandry and habitat clues. For founding colonies, use a standard test tube setup with a water reservoir and cotton plug. Keep the tube in darkness and avoid disturbing the queen during the founding period. Once the colony reaches a reasonable size, they can be moved to a formicarium such as a Y-tong or plaster nest with moderate humidity chambers. Include an outworld area for foraging. ^[1]

Feeding and Diet

Pheidole species are generalist omnivores, and P. bison likely follows this pattern. Feed a mix of protein and carbohydrate sources. Protein options include small insects like fruit flies or pinhead crickets, and carbohydrate sources include sugar water or honey. Once established, offer small seeds for majors to process. Feed protein 2-3 times per week and keep sugar water available constantly. Remove uneaten prey after 24-48 hours to prevent mold. ^[1]

Temperature and Seasonal Care

As a Neotropical species from Bolivia, P. bison prefers warm conditions around 24-28°C. This can be achieved with room temperature or a heating cable on one side of the nest to create a gentle gradient. Avoid temperatures below 20°C or above 32°C. Given their tropical origin, a true hibernation or diapause is not required, but activity may slow in cooler months. ^[1]

Frequently Asked Questions

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References