Nesomyrmex spininodis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Neotropical region, found across Argentina, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Paraguay, Suriname, Trinidad and Tobago, and Venezuela. They inhabit tropical dry forests, Atlantic forest fragments, and cerrado savanna. These ants are exclusively arboreal, nesting in plant structures like bromeliad infructescences and tree galls ^[1][2][3].
• Colony Type: Colony structure is unconfirmed in scientific literature. Based on genus patterns, likely monogyne (single queen) colonies, but no specific data exists.
• Size & Growth:
  • Queen: Size data unavailable, inferred from Nesomyrmex genus to be around 5-6mm
  • Worker: Worker size is small, exact body length not available in context. Inferred from genus to be around 3-4mm
  • Colony: Up to 7 workers based on one documented colony in a stem-gall ^[2]
  • Growth: Moderate, inferred from typical Myrmicinae development
  • Development: Estimated 6-10 weeks at tropical temperatures (Development time is not directly studied, tropical climate suggests faster development)
• Antkeeping:
  • Temperature: Keep warm, around 24-28°C, based on tropical habitat
  • Humidity: Keep nest substrate consistently moist but not waterlogged, based on arboreal habitat
  • Diapause: Unknown, tropical species may not require formal diapause
  • Nesting: Exclusively arboreal, provide climbing structures and vertical space. Use Y-tong nests or naturalistic setups with cork bark and twigs ^[2][1]
• Behavior: Exclusively arboreal and arboreal foragers, they forage on vegetation rather than on the ground. Workers are small and can escape through standard barrier setups if not careful. Temperament is not aggressive, they are shy, cryptic ants that avoid confrontation. Foraging strategy involves searching for honeydew and small arthropods on leaves and stems ^[3][1].
• Common Issues: escape prevention is critical, tiny workers can squeeze through small gaps, arboreal nature means they need climbing structures and vertical space in captivity, slow colony growth can frustrate beginners, tropical humidity requirements can lead to mold if ventilation is poor, wild-caught colonies may have parasites that affect survival

Housing and Nest Setup

Nesomyrmex spininodis is an exclusively arboreal species, meaning they live and forage in trees and shrubs rather than on the ground. In the wild, they nest in unusual locations like bromeliad flower stalks (infructescences) and senescent stem-galls on trees ^[2][1]. For captive care, you'll need to replicate this arboreal lifestyle. A naturalistic setup with cork bark, small twigs, and artificial plant stems works well. You can use a Y-tong nest, but provide plenty of climbing structures and vertical space within the outworld. These ants do best with a formicarium that allows them to travel vertically between chambers. Because they are so small, ensure your escape prevention is excellent, they can squeeze through gaps as small as 1mm.

Feeding and Diet

Based on their arboreal lifestyle, these ants likely forage for honeydew from aphids and scale insects on vegetation, plus small arthropods. In captivity, offer sugar water or honey water as a constant energy source. For protein, provide small live prey like fruit flies, pinhead crickets, or other tiny insects. Because they are so small, prey items should be appropriately sized, anything larger than 2mm may be too big for them to tackle. Feed protein 2-3 times per week, and keep sugar water available at all times.

Temperature and Humidity

As a Neotropical species from tropical and subtropical regions, Nesomyrmex spininodis needs warm, humid conditions. Keep the nest area at 24-28°C. You can use a heating cable on one side of the nest to create a temperature gradient, place it on top of the nest, not underneath, to avoid evaporating moisture too quickly. Humidity should be moderate, keep the nest substrate consistently moist but not waterlogged. Their natural habitats include humid forests, so the nest substrate should remain consistently moist. However, avoid creating stagnant, overly wet conditions that promote mold. Good ventilation is essential, use small ventilation holes that don't allow escapes.

Colony Dynamics and Growth

Colony size appears to be small in this species. One documented wild colony in a stem-gall contained only 7 individuals ^[2]. This suggests mature colonies are compact, making them suitable for smaller setups. The exclusively arboreal nature of this genus means they don't form large ground-nesting colonies. Queens have not been directly measured, but based on related Nesomyrmex species, expect queens around 5-6mm. Development time is not documented, but tropical Myrmicinae typically develop from egg to worker in 6-10 weeks at warm temperatures. Colonies grow slowly compared to ground-nesting species, so patience is required.

Behavior and Temperament

Nesomyrmex spininodis is a shy, non-aggressive species. As an arboreal ant, they spend their time foraging on vegetation rather than patrolling the ground. Workers are small and quick, actively searching for honeydew and small prey on leaves and stems. They are not defensive and rarely sting, their main defense is fleeing. Because of their small size and arboreal nature, they are excellent escape artists. Always use fine mesh barriers and tight-fitting lids. These ants are best observed in a naturalistic setup where you can watch them climbing and foraging on provided structures. ^[3][1]

Frequently Asked Questions

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References