Solenopsis crivellarii

Solenopsis crivellarii

Solenopsis crivellarii is a tiny fire ant species endemic to Greece, specifically found on the island of Karpathos in the Dodecanese archipelago ^[1][2]. Workers are small, typically measuring 2-4mm, with the characteristic yellow to reddish coloration common in the genus Solenopsis. This species is part of the Solenopsidini tribe within Myrmicinae. The species was originally described by Menozzi in 1936 from specimens collected along the Milo stream near Diafani on Karpathos ^[1].

This ant shows an interesting ecological association, colonies are very often found nesting in close proximity to Camponotus ant nests ^[3]. This relationship appears to benefit S. crivellarii, though the exact nature of the association is not fully documented. The species prefers humid montane meadows and deciduous forest edges, nesting beneath rocks covered by grass or herbs ^[3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Karpathos Island in the Dodecanese region of Greece. Found in deciduous forests and humid montane meadows, typically nesting under rocks overgrown with grass or herbs ^[3][2].
• Colony Type: Monogyne, single queen colonies. Colonies are monogynous with one reproductive queen per nest ^[3].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Small gynes (queens), exact measurements unconfirmed, genus-level estimate 4-6mm ^[2]
  • Worker: 2-4mm
  • Colony: Likely small to moderate, typical for Mediterranean Solenopsis species, likely several hundred workers at maturity
  • Growth: Moderate, inferred from related Mediterranean Solenopsis species
  • Development: Estimated 5-8 weeks at optimal Mediterranean temperatures (24-28°C) (Development time is estimated based on typical Solenopsis patterns. Direct observations for this specific species are lacking.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, these are Mediterranean ants adapted to warm conditions. A slight temperature gradient allows workers to self-regulate. Avoid temperatures below 18°C for extended periods.
  • Humidity: Moderate to high, they naturally inhabit humid montane meadows. Keep nest substrate moist but not waterlogged, with some drier areas available. Think damp forest floor conditions ^[3].
  • Diapause: Yes, as a Mediterranean species, they likely require a mild winter rest period (diapause) around 10-15°C for 2-3 months, though specific requirements are unconfirmed.
  • Nesting: They nest under rocks in nature. In captivity, a naturalistic setup with flat stones over soil or a Y-tong/plaster nest with narrow chambers works well. They prefer tight, enclosed spaces similar to their natural rock crevice nests ^[3].
• Behavior: These are small, active ants with typical Solenopsis foraging behavior, they scavenge and may opportunistically hunt small prey. Workers are aggressive for their size and will defend the colony vigorously. They possess a functional stinger and can deliver a painful sting, handle with care. Escape prevention is important due to their small size, use fine mesh barriers. They are known to form close associations with Camponotus colonies in the wild ^[3].
• Common Issues: small size makes escape likely without fine mesh barriers, sting is painful, avoid handling without protection, humidity control is critical, too dry causes colony decline, winter diapause requirements may be poorly understood for this species, taxonomic uncertainty means wild-caught colonies may include similar species requiring identification verification

Temperature and Care

Solenopsis crivellarii originates from the Mediterranean region of Greece, so they prefer warm conditions. Keep the nest area at 24-28°C for optimal brood development. A heating cable on one side of the nest creates a temperature gradient that allows ants to self-regulate. Place the heating on top of the nest, not underneath, to prevent excessive drying.

During winter, reduce temperatures to around 10-15°C for 2-3 months to simulate their natural seasonal cycle. This diapause period is important for colony health and may trigger reproductive behavior in spring. Monitor colony activity, if workers become sluggish and cluster together, temperatures are appropriate for hibernation. Do not feed during diapause but ensure some moisture is available.

Avoid sudden temperature fluctuations and keep them away from cold drafts. Room temperature in most homes (20-24°C) is acceptable but may slow growth slightly. ^[3]

Nesting Preferences

In the wild, Solenopsis crivellarii nests beneath rocks overgrown with grass or herbs in humid montane meadows and deciduous forest edges ^[3]. They prefer tight, enclosed spaces that maintain humidity while providing protection. The species shows a notable tendency to nest near Camponotus colonies, though the exact nature of this relationship is unclear.

For captive care, a naturalistic setup works well, a layer of moist soil or plaster with flat stones on top mimics their natural nesting sites. Alternatively, a Y-tong (AAC) nest with narrow chambers provides the tight spaces they prefer. Whatever setup you choose, ensure the chambers are appropriately scaled to their tiny 2-4mm worker size.

Keep the nest humid but not waterlogged. The substrate should feel damp to the touch. Provide a water tube as a moisture source and mist occasionally if the nest begins drying out. Good ventilation is essential to prevent mold while maintaining humidity.

Feeding and Diet

Like other Solenopsis species, Solenopsis crivellarii is omnivorous with a preference for protein-rich foods. In captivity, offer small live prey such as fruit flies, pinhead crickets, and small mealworms. They will also accept sugar sources, a drop of honey water or sugar water can be offered occasionally.

Feed small amounts 2-3 times per week, removing any uneaten prey after 24 hours to prevent mold. Remove sugar water sources after a few hours as they can ferment. The colony size will determine appropriate portion sizes, start small and adjust based on how quickly food is consumed.

Their small size means prey should be appropriately sized, anything larger than themselves may be ignored or only partially consumed. Fresh killed prey is often more readily accepted than live prey that escapes easily.

Behavior and Temperament

Solenopsis crivellarii has typical fire ant temperament, workers are aggressive and will readily defend the colony. They possess a functional stinger and can deliver a painful sting, so handle with care. Unlike some larger ants that can be safely handled, these tiny ants should be considered potentially dangerous to handle without protection.

Workers are active foragers, searching for food both individually and through recruitment. They are adept at finding and exploiting small food sources. Their small size allows them to access areas larger ants cannot, but also makes them prone to escaping through tiny gaps.

The notable ecological association with Camponotus nests in the wild is interesting, colonies are very often found near Camponotus nests ^[3]. This may provide some competitive advantage or access to resources, though this relationship has not been extensively studied. In captivity, this association does not need to be replicated.

Escape prevention is critical due to their tiny size. Use fine mesh (at least 0.5mm) on all openings and consider applying fluon to the edges of the outworld.

Colony Founding and Growth

Like other Solenopsis species, founding is likely claustral, the queen seals herself in a small chamber and raises the first brood alone using stored fat reserves. She does not leave to forage during founding. The first workers (nanitics) are typically smaller than mature workers and emerge after several weeks.

Colony growth is moderate, once the first workers (nanitics) emerge, the colony will gradually expand. Expect 6-12 months to reach 50 workers, and 1-2 years to reach several hundred workers under optimal conditions. Growth rate depends heavily on temperature and feeding frequency.

The species is monogynous, colonies have a single queen ^[3]. Unlike some related species, there is no evidence of multiple queens or ergatoid replacement reproductives. If your colony has multiple queens, they should be separated to prevent fighting.

Note that taxonomic uncertainty exists for this species and related small-gyne Solenopsis species ^[2]. Wild-caught colonies may include similar species requiring expert identification verification.

Frequently Asked Questions

References