Eurhopalothrix lenkoi

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Atlantic Forest of São Paulo, Brazil (Caraguatatuba and Ubatuba region). Found at low elevation (40m) nesting inside bromeliaceous plants, both on fallen tree trunks in forest understory and directly on soil ^[1][2][3].
• Colony Type: Colony structure is unconfirmed. Only known from small series of specimens collected from two bromeliad nests. No data on queen number or colony size in the wild.
• Size & Growth:
  • Queen: 5.6mm total length ^[1], largest New World Eurhopalothrix
  • Worker: 3.7-4.2mm total length ^[1]
  • Colony: Unknown, only known from small collection samples
  • Growth: Unknown, likely slow based on genus patterns
  • Development: Unknown, no development data exists for this species. (No direct observations of colony development.)
• Antkeeping:
  • Temperature: Keep warm, around 24-27°C. This species comes from coastal Brazil where temperatures are consistently warm year-round. Inferred from geographic range.
  • Humidity: Very high humidity is essential. Their natural nesting in bromeliads indicates they need consistently moist conditions, keep nest substrate moist but not waterlogged, with good ventilation to prevent mold ^[1][3].
  • Diapause: No diapause expected. As a tropical species from coastal São Paulo, year-round activity is likely. Inferred from geographic range.
  • Nesting: This is a specialized bromeliad-nesting ant. In captivity, they do well in naturalistic setups with tight chambers that retain humidity. Y-tong (AAC) nests or plaster nests with small chambers work well. Provide moss or live plants to maintain humidity and mimic their bromeliad homes ^[1][2].
• Behavior: This is a cryptic, slow-moving leaf-litter ant that forages in the upper layers of forest floor debris. Workers are not aggressive and rely on camouflage and their specialized hairs for defense. They possess a functional stinger typical of Myrmicinae ants, though it is less medically significant. They are likely predatory on micro-arthropods like springtails, as is typical for the genus. Escape prevention should be standard, while not tiny, they are small enough to slip through small gaps.
• Common Issues: extreme rarity makes colonies nearly impossible to obtain, this species has rarely been collected since its description, bromeliad-specialist nesting means they have very specific humidity requirements that differ from typical ground-nesting ants, no captive breeding data exists, wild colonies are the only source, slow growth and small colony sizes mean colonies are fragile and slow to develop, lack of dietary information makes feeding challenging, they may refuse standard ant foods

Discovery and Rarity

Eurhopalothrix lenkoi was described by Kempf in 1967 from specimens collected by K. Lenko from bromeliad plants in the Caraguatatuba region of São Paulo state ^[1]. The species has been rarely encountered since, with only a handful of specimens known from the original collections. This makes it one of the most difficult Eurhopalothrix species to keep, as captive colonies essentially do not exist in the antkeeping hobby. The type series came from two locations: one nesting in a bromeliad on a fallen tree trunk in the woods, and another from a bromeliad growing directly on the soil on an island off Ubatuba ^[2]. This specialized bromeliad-nesting habit is unusual among ants and contributes to the challenge of keeping this species.

Housing and Nest Setup

Given their natural association with bromeliads, these ants need a setup that maintains very high humidity while providing proper ventilation. A naturalistic terrarium-style enclosure works best, use a small container with a moisture-retaining substrate and include live or artificial plants to help maintain humidity. The nest chamber itself should be small and tight-fitting, these are tiny ants that feel exposed in large open spaces. Y-tong (AAC) nests or plaster nests with narrow chambers work if humidity is maintained in the surrounding outworld. Avoid dry conditions entirely, this species will not survive in typical room-temperature, low-humidity setups.

Feeding and Diet

The diet of Eurhopalothrix lenkoi is not documented, but the genus is typically predatory on small soil micro-arthropods. Based on related species, they likely accept small live prey such as springtails, isopods, and other micro-arthropods. They may also feed on sugar sources occasionally, though this is unconfirmed for this specific species. Given their small size and specialized feeding biology, primary food should be live micro-prey. Feed small amounts of prey twice weekly and remove any uneaten items promptly to prevent mold.

Temperature and Seasonal Care

As a tropical species from coastal São Paulo, Brazil, Eurhopalothrix lenkoi needs warm conditions year-round. Keep the nest area at 24-27°C with a slight gradient allowing workers to move between warmer and cooler areas. A heating cable on one side of the nest can provide warmth. Since they come from a region with minimal temperature variation, no diapause or winter rest is needed. However, watch for seasonal slowdowns during cooler months and reduce feeding accordingly. Avoid temperatures below 20°C for extended periods.

Behavior and Temperament

Eurhopalothrix lenkoi is a cryptic, slow-moving ant that forages in leaf litter and upper soil layers. Workers are not aggressive and rely on their specialized hairs and camouflage for defense rather than active confrontation. They possess a functional stinger typical of Myrmicinae, though it is rarely used and medically insignificant. Colonies are likely small and slow-growing, with workers spending most of their time in the nest or foraging short distances. They are not escape artists, but their small size means standard barrier methods should still be used.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References