Solenopsis alvarengai

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Known only from the type locality in Mato Grosso, Brazil: Vila Vera (12°46'S,55°30'W) ^[2]. The habitat is inferred as tropical savanna (Cerrado) with warm temperatures year-round. The holotype queen was collected in October 1973,corresponding to late spring in the southern hemisphere ^[2].
• Colony Type: Unconfirmed. Colony structure has not been documented for this species. Many Solenopsis species are polygynous (multiple queens per colony), but specific data is lacking.
• Size & Growth:
  • Queen: Unknown, no measurements available. Estimated 4-7 mm based on typical Solenopsis genus patterns.
  • Worker: Unknown, no worker specimens described in available literature.
  • Colony: Unknown, no colony size data available for this species.
  • Growth: Unconfirmed. Development timeline has not been studied.
  • Development: Unconfirmed, estimated 4-8 weeks based on typical tropical Solenopsis species at optimal temperatures (25-30°C). (No direct development data exists for this species. Estimates are based on genus-level patterns for Solenopsis in tropical regions.)
• Antkeeping:
  • Temperature: Estimated 24-30°C based on native tropical habitat in central Brazil. Provide a temperature gradient to allow self-regulation.
  • Humidity: Likely moderate to high (50-70%), typical of tropical savanna regions. Provide a moisture gradient with damp substrate areas.
  • Diapause: Unlikely, tropical Brazil suggests year-round activity without true hibernation. Activity may slow during cooler months.
  • Nesting: Natural nesting behavior unconfirmed. Based on typical Solenopsis patterns, they likely nest in soil with shallow to moderate depth chambers. In captivity, use test tubes with dirt setups, Y-tong (AAC), plaster, or soil nests.
• Behavior: Undocumented in scientific literature. Based on genus-level patterns, Solenopsis alvarengai likely forages for small invertebrates and sugary substances, uses defensive stinging, and nests opportunistically in disturbed areas. Handle with caution due to stinging capability. Their small size means they can escape through tiny gaps, so ensure secure enclosures.
• Common Issues: limited data makes specific care recommendations uncertain, stinging capability requires careful handling and secure escape prevention, colony founding success rates are unknown and may need experimentation, wild-caught colonies may carry parasites or pathogens not yet documented, slow colony growth typical of lesser-studied species may test keeper patience

Species Background and Taxonomy

Solenopsis alvarengai was originally described as Solenopsis alvarengai before phylogenetic analysis in 2015 synonymized Carebarella under Solenopsis ^[1]. The type specimen (holotype gyne) was collected in October 1973 from Vila Vera, Mato Grosso, Brazil, by M. Alvarenga, after whom the species is named ^[2]. This species remains one of the least studied in Solenopsidini, with virtually no published research on its ecology, behavior, or captive care.

Natural Habitat and Distribution

Solenopsis alvarengai is known only from its type locality in Mato Grosso, Brazil ^[2]. This region has a tropical savanna climate (Cerrado) with warm temperatures year-round (typically 20-35°C), distinct wet and dry seasons, and moderate to high humidity. The coordinates 12°46'S 55°30'W place it in central-western Brazil. The October collection date suggests nuptial flights may occur in late spring, but this has not been directly documented.

Estimated Care Requirements

Because species-specific data is lacking, care recommendations are estimated from typical Solenopsis husbandry. Keep the nest at 24-30°C with a temperature gradient. Provide moderate humidity (50-70%) with a moisture gradient. They likely accept a varied diet including small insects, sugar water, and honey. Given their small size and stinging ability, use tight-fitting lids and appropriate barriers to prevent escapes. Test tube setups with cotton-plugged water reservoirs are good for founding colonies.

Behavior and Defense

Specific behavior has not been documented for S. alvarengai. The genus Solenopsis is known for defensive stinging, and workers of this species likely deliver painful stings when threatened. Foraging is probably opportunistic: scavenging and preying on small invertebrates. Colonies may defend their nest and food sources aggressively. Workers are small (estimated 2-4 mm based on genus patterns), so secure enclosure is critical to prevent escapes.

Frequently Asked Questions

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References