Formica pisarskii

Formica pisarskii

Formica pisarskii is a small, dark ant species belonging to the Coptoformica subgenus. Workers measure just 1.2-1.4mm and have a distinctive appearance: nearly black with a brilliant shine, long elongated head, and a unique combination of standing hairs on the clypeus and pronotum but very reduced eye hairs. The species is known only from Mongolia and surrounding regions of Central Siberia, making it a rare find in antkeeping. It inhabits open steppe and mountain-steppe habitats at elevations between 600-2400m, nesting either under stones or building small mounds of finely cut grass particles. This is one of the most common ant species in Mongolia, where it thrives on southern-facing slopes with sparse vegetation ^[1][2][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Mongolia and Central Siberia (Russia). Found in open steppes and mountain-steppes between 500-2300m elevation. Prefers southern slopes of hill tops with sparse grassy vegetation. Nests are typically small mounds of grass particles or under stones without epigaeic structures ^[1][3][2].
• Colony Type: Facultatively polygynous, colonies can have a single queen (monogyne) or multiple queens (polygyne). Both colony types have been documented in the wild. Ergatoid (wingless) replacement reproductives may occur if the primary queen dies ^[4].
  • Colony: Optionally polygyne
• Size & Growth:
  • Queen: ~1.3mm (CL 1270 μm) ^[1]
  • Worker: 1.2-1.4mm (CL 1200-1384 μm) ^[1]
  • Colony: Estimated several hundred workers based on similar Coptoformica species. Maximum size not documented ^[4].
  • Growth: Moderate, typical for Formica genus
  • Development: Estimated 6-8 weeks at optimal temperature based on genus patterns for Formica species (Development time inferred from related Coptoformica species. Temperature-dependent, cooler conditions slow development significantly.)
• Antkeeping:
  • Temperature: Keep at 20-24°C. As a cold-resistant species from Siberia and high-elevation Mongolia, they can tolerate cooler temperatures but prefer moderate warmth for active foraging and brood development. Room temperature (20-22°C) is suitable, with a slight gradient if possible.
  • Humidity: Low to moderate. This is a xerophilic (dry-loving) species from steppe habitats. Keep nest substrate moderately dry, similar to their natural steppe environment. Avoid overly damp conditions.
  • Diapause: Yes, as a cold-resistant species from Siberia and Mongolia, they require a winter dormancy period. Reduce temperature to 5-10°C for 3-4 months during winter, mimicking their natural cold season.
  • Nesting: Y-tong (AAC) nests work well given their small size. Can also use plaster or naturalistic setups with stones. They prefer tight chambers and narrow passages. Avoid overly humid setups, this species prefers drier nest conditions than many tropical ants.
• Behavior: Generally peaceful and not aggressive. Workers are small but active foragers. They are zoophagous (predatory on small invertebrates) and also tend aphids for honeydew. Foraging territories are partially defended. They may form polygynous colonies with multiple queens. Escape risk is moderate, their small size means they can slip through small gaps, but they are not strong climbers like some Formica species. They are not known for stinging and pose no danger to keepers.

Housing and Nest Setup

Formica pisarskii is a small ant that needs appropriately scaled housing. A Y-tong (AAC) nest with narrow chambers works well, as does a plaster nest or a naturalistic setup. Because they are from dry steppe habitats, keep the nest relatively dry, avoid the damp conditions you'd use for tropical species. The nest should have tight-fitting barriers as these tiny ants can squeeze through small gaps. A small outworld for foraging is sufficient given their colony size. Use a test tube setup for founding colonies, then transition to a small formicarium as the colony grows to several dozen workers. ^[1][3]

Feeding and Diet

In the wild, F. pisarskii is a zoophagous predator that hunts small invertebrates and also tends aphids for honeydew. In captivity, offer small protein sources like fruit flies, small crickets, and other tiny insects. Sugar water or honey can be offered occasionally, though they primarily rely on protein. Like other Formica species, they benefit from a varied diet. Feed small prey items 2-3 times per week for growing colonies, and remove any uneaten prey to prevent mold. ^[4]

Temperature and Seasonal Care

This species comes from cold regions of Mongolia and Siberia, so it handles cooler temperatures better than most ants. Keep the nest at 20-24°C for optimal activity and brood development. During winter, they require a diapause (hibernation) period of 3-4 months at 5-10°C. This mimics their natural cycle in the steppe and mountain regions where temperatures drop significantly in winter. Reduce feeding during hibernation and keep the colony mostly undisturbed. Do not attempt to keep them active year-round, the winter rest is essential for their health. ^[3]

Colony Structure and Growth

F. pisarskii is facultatively polygynous, meaning colonies can have either a single queen or multiple queens working together. Both types occur naturally in the wild. The colony grows moderately, expect several months to reach 50+ workers. Maximum colony size is not well documented but similar Coptoformica species typically reach several hundred workers. Growth is slower in cooler conditions and speeds up at optimal temperatures. Queens are very small (~1.3mm) compared to many Formica species. ^[4][1]

Behavior and Foraging

Workers are active foragers that hunt small prey and collect honeydew from aphids. They defend their foraging territories partially, which is typical for Formica species. They are not aggressive toward keepers and do not sting. Their small size makes them less intimidating than larger Formica species. Workers are primarily ground-dwelling and not strong climbers, so escape prevention should focus on sealing small gaps rather than using liquid barriers. They are most active during warmer months and reduce activity significantly in winter. ^[4]

Frequently Asked Questions

References