Blepharidatta fernandezi

Blepharidatta fernandezi

Blepharidatta fernandezi is a small Myrmicinae ant belonging to the tribe Attini (fungus-growing ants). Workers measure approximately 5.5mm in total length, making them relatively small among ants. They have a predominantly black body with sparse, irregular rugae (wrinkles) covering most surfaces. The most distinctive physical features include extremely long propodeal spines that are as long as the entire petiole, a strongly pedunculate (stalked) petiole, and eyes that are barely visible in frontal view, the only species in its genus with this trait. The head has a unique tumuliform (mound-like) subtriangular projection on the dorsal surface ^[1].

This species is known only from the Colombian and Brazilian Amazon regions, making it a true Neotropical rainforest ant. Unfortunately, nothing is known about its biology in the wild, no queen, male, or larval specimens have ever been documented. As a member of the Attini tribe, it likely cultivates fungus for food, but this remains unconfirmed. Given how little is known about this species, it represents an exciting opportunity for dedicated antkeepers willing to document their observations carefully.

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Colombian and Brazilian Amazon rainforest. Known from Amazonas and Vaupés in Colombia, and Rio Javari in Brazil ^[1][2][3]. This is a tropical rainforest environment with high humidity and stable warm temperatures year-round.
• Colony Type: Unknown, only worker specimens have been collected. Colony structure (single queen vs. multiple queens) has not been documented.
• Size & Growth:
  • Queen: Unknown, queen caste has not been described ^[1]
  • Worker: 5.5mm total length, head length 1.15-1.3mm, head width 1.15-1.25mm ^[1]
  • Colony: Unknown, only a few worker specimens have ever been collected ^[1]
  • Growth: Unknown
  • Development: Unknown, no brood development data exists for this species (Development timeline has not been studied. Related Attini species typically take 2-4 months from egg to worker at tropical temperatures.)
• Antkeeping:
  • Temperature: Likely needs warm conditions around 24-28°C based on its Amazonian distribution. Provide a temperature gradient allowing workers to self-regulate.
  • Humidity: Requires high humidity (70-85%) consistent with tropical rainforest habitat. Keep substrate consistently moist but not waterlogged.
  • Diapause: Unlikely, Amazonian species do not typically experience cold winters requiring dormancy.
  • Nesting: Unknown natural nesting preferences. As an Attini species, they likely nest in soil or decaying wood within the forest floor. A naturalistic setup with moist substrate or a Y-tong/plaster nest would be appropriate starting points.
• Behavior: Behavior is completely unstudied. As a member of the Attini tribe, they likely have typical Myrmicinae temperament, not particularly aggressive but will defend the colony. Their small size (5.5mm) and cryptic eye structure suggest they may be more secretive or ground-dwelling. Escape prevention should be excellent given their small size, standard barrier methods work for ants of this dimension.
• Common Issues: No biological data exists, everything about keeping this species successfully is speculative, Colony establishment may be extremely difficult since no queens have ever been documented for sale or collection, Growth and development timelines are completely unknown, Humidity and temperature requirements are inferred only from geographic range, Risk of acquiring wild-caught colonies that may have parasites or be stressed from collection

Why This Species Is So Challenging

Blepharidatta fernandezi represents one of the most poorly documented ant species in the hobby. Scientists have only ever collected a handful of worker specimens, no queens, no males, no larvae, and no observations of live colonies. This means there is zero scientific data on what this ant eats, how it builds nests, how fast it grows, or even how many queens a colony has ^[1].

For antkeepers, this presents a unique challenge: you will essentially be a pioneer. Every observation you make could be the first documented information about this species in captivity. This requires exceptional record-keeping, patience, and willingness to experiment carefully with care conditions. You should expect to lose colonies while learning what works, this is the nature of keeping data-deficient species.

Taxonomy and Identification

This species was formally described in 2015 by Brandão, Feitosa, and Diniz. It belongs to the tribe Attini within the subfamily Myrmicinae, the same tribe that includes the famous leaf-cutter ants (Atta and Acromyrmex). However, Blepharidatta is a much more modest member of this group, not cultivating large fungal gardens like its famous relatives.

Key identification features include: total length of almost 5.5mm, predominantly black coloration, extremely long propodeal spines (as long as the entire petiole), and eyes that are barely visible from the front. The head has a distinctive mound-like projection. These ants are larger than most typical small Myrmicines but smaller than leaf-cutter ants ^[1].

Housing Recommendations

Since we know nothing about this species' nesting preferences, you should start with a naturalistic setup that mimics Amazon rainforest floor conditions. Use a mix of soil and organic material as substrate, kept consistently moist. A test tube setup can work for founding colonies, but you may need to transition to a more naturalistic formicarium as the colony grows.

Given their small size and likely ground-dwelling nature, provide deep substrate (at least 5-10cm) for potential tunneling. Include small pieces of decaying wood or leaf litter to create microhabitats. Ensure excellent escape prevention, ants this small can slip through surprisingly small gaps. Use fluon on container rims and fine mesh for any ventilation openings.

Feeding and Diet

The diet for Blepharidatta fernandezi is completely unstudied. As members of the Attini tribe, they almost certainly cultivate fungus for food, as this is the defining characteristic of the tribe. However, they may not be active leaf-cutters like Atta species, many Attini are smaller and cultivate fungus on collected detritus rather than fresh leaves.

For captive care, start by offering: small amounts of crushed insects (fruit flies, pinhead crickets), small pieces of decaying leaves or other organic material, and perhaps a small piece of mushroom. Monitor closely for any fungal growth they might be cultivating. Sugar water or honey may be accepted but is not a primary food source for most Attini. Remove uneaten food within 48 hours to prevent mold.

Temperature and Humidity

Based on the species' geographic range in the Amazon basin, these ants almost certainly require warm, humid conditions. Aim for temperatures in the range of 24-28°C with a slight gradient so workers can choose their preferred microclimate. Avoid temperatures below 22°C or above 30°C.

Humidity should be high, think damp forest floor. The substrate should feel consistently moist but never waterlogged. Provide a water reservoir or mist regularly to maintain humidity. A hygrometer near the nest should read 70-85%. Good ventilation is important to prevent mold, but avoid excessive airflow that dries the setup.

Legal and Ethical Considerations

Blepharidatta fernandezi is native to Colombia and Brazil. If you are keeping this species outside these countries, verify all relevant import regulations and permits. Antkeeping hobbyists should only purchase from reputable breeders who can document legal collection and export.

If you are in the species' native range and collect from the wild, do so sustainably. These ants are known from very few localities, so wild collection could potentially impact local populations. Always leave some specimens in the wild and never collect the entire colony.

Frequently Asked Questions

References