Vombisidris thompsoni

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Known only from primary forest on Luzon Island, Philippines. Collected by nocturnal beating of low vegetation in a transect study at the UP Dynamic Plot, Barangay Villarobles, Palanan, Isabela Province ^[1][2].
• Colony Type: Unknown, only three workers have ever been collected, no queens or colony structure documented ^[1].
• Size & Growth:
  • Queen: Unknown, queen not described ^[1].
  • Worker: Size data unavailable, only head length measurements exist (0.65-0.70 mm head length), but total body length is not recorded. Based on the tiny head size, the full body is likely under 3 mm ^[1].
  • Colony: Unknown, no natural colony observed.
  • Growth: Unknown
  • Development: Unknown, no development data exists for this species. Rough estimate: 4-8 weeks at 24-26°C if similar to other tropical Myrmicinae, but this is pure speculation. (All timelines are guesses for this unstudied species.)
• Antkeeping:
  • Temperature: Start around 24-26°C based on tropical Philippine origin. Avoid temperatures below 20°C. Adjust if the colony shows signs of stress, this is an estimate ^[1].
  • Humidity: Keep the nest substrate consistently moist but not waterlogged, mimicking a damp forest floor. Provide a humidity gradient so ants can choose their preferred zone ^[1].
  • Diapause: Unknown, as a tropical species, it likely does not require a cold hibernation period, but activity may slow during cooler months. Do not apply artificial cold treatment without evidence ^[1].
  • Nesting: No natural nest data exists. Based on collection from low vegetation, they may nest in small cavities in rotting wood, leaf litter, or soil ^[1]. Start with a small test tube setup or a miniature formicarium with tight seals.
• Behavior: Almost unknown. The collection method (nocturnal beating of vegetation) suggests these ants are active on plants at night ^[1]. Their tiny size and yellow color are typical of leaf-litter dwellers. They likely use a smear defense (flattened stinger to wipe venom) as is typical for the Crematogastrini tribe, though this has not been documented for this species. Escape prevention is critical: at an estimated total length under 3 mm, they can squeeze through the tiniest gaps.
• Common Issues: no captive care history exists, you are starting from scratch with this species., escape prevention is critical due to extremely small size, use fluon barriers and fine mesh (0.3 mm or smaller)., no established feeding guidelines, start with micro-prey like springtails and observe acceptance., very slow colony growth expected, be patient and avoid overfeeding., wild-caught colonies may carry parasites or fail to adapt to captivity.

Why This Species Is Challenging

Vombisidris thompsoni is one of the hardest ants you could pick. It was only described in 2025 from three workers, no queens, no colony, no biology ^[1]. That means every part of its care is a guess. You'll be making up the care guide as you go. This species is not for beginners, you need experience with tough species and a lot of patience. The upside? You could be the first person to document their captive life, and that's exciting for the antkeeping community ^[1].

Housing and Escape Prevention

Because these ants are tiny (head length 0.65-0.70 mm, body likely under 3 mm), they can slip through any gap you can see and many you can't ^[1]. Use a test tube setup with a fluon-coated barrier on the exit. Seal all joints with plumber's tape or silicone. Avoid acrylic nests with large openings, a plaster or Y-tong setup with very fine channels works better. Never use mesh larger than 0.3 mm. Keep it simple: fewer parts mean fewer escape routes. Regularly check for condensation and mold.

Temperature and Humidity

Luzon is tropical, so keep your colony warm and stable. Start at 24-26°C, and never let it drop below 20°C ^[1]. Use a heating cable on one side of the nest to create a gradient. For humidity, keep the nest substrate damp but not wet, imagine a forest floor after rain. Misting the outworld once a day can help, but avoid flooding the nest. If you see ants clustering in the driest area, the nest may be too wet, if they all huddle near the water source, it's too dry. Watch their behavior and adjust.

Feeding - Starting Guidelines

Nobody knows what Vombisidris thompsoni eats. Given their tiny size and plant-foraging habits, try live springtails as a staple ^[1]. Also offer booklice, fruit fly larvae, and other small arthropods. Provide a tiny drop of honey-water (1:1 with water) once a week. Feed sparingly, uneaten food molds quickly in humid conditions. Remove leftovers within 24 hours. Be willing to experiment: if they ignore one prey type, try another. Document what works.

Growth and Development Expectations

Expect very slow growth. Without any species data, a reasonable guess based on similar tiny tropical Myrmicinae is an egg-to-worker time of 4-8 weeks at 24-26°C ^[1]. First nanitic workers will be even tinier than the mother queen (if you find one). Mature colony size is unknown but likely under 100 workers based on the small worker size. Do not overfeed hoping to speed things up, that causes mold and stress. Record everything you observe: you might be writing the first captive biology report for this species.

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