Strumigenys decipula

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Neotropical region, Brazil, Colombia, Ecuador, and Peru. Recorded from tropical forest floors at elevations from 300m to 2730m ^[2].
• Colony Type: Unconfirmed, based on Strumigenys patterns, probably single‑queen (monogyne), but this has not been studied.
• Size & Growth:
  • Queen: Size data unavailable, queens have not been described in published literature.
  • Worker: 2.1-2.2mm total length ^[1]
  • Colony: Unknown, likely small, as is typical for Strumigenys, but no published colony counts exist.
  • Growth: Unknown
  • Development: Unknown, no species‑specific data. Based on related small myrmicines, development may take several weeks at warm temperatures, but this is a rough guess. (All development data is speculative because the biology of this species has not been studied.)
• Antkeeping:
  • Temperature: Keep warm and stable, roughly 22-26°C. Avoid temperatures below 20°C or above 30°C. Based on Neotropical forest habitat, they prefer steady warmth ^[2].
  • Humidity: High humidity is essential. The nest substrate should be consistently moist but not waterlogged. Aim for 70-85% relative humidity, typical of forest‑floor leaf litter.
  • Diapause: Unlikely to require true hibernation because the species comes from tropical latitudes. However, they may slow down during cooler or drier periods, monitor and adjust care if needed.
  • Nesting: In nature they probably nest in rotting wood, leaf litter, or soil. A small test‑tube setup works for founding. For established colonies, use a small plaster or Y‑tong nest with chambers scaled to their tiny size. Because they are only 2mm, use very fine mesh (under 0.5mm) on all openings to prevent escape.
• Behavior: Strumigenys decipula is a specialized predator that uses its trap‑jaw mandibles to capture tiny prey like springtails. They are not aggressive toward humans but can sting, the sting is very small and not medically significant. Their minute size means they can squeeze through impossibly small gaps, so escape prevention is your top priority. Colonies are likely shy and may abandon brood if disturbed.
• Common Issues: very small size makes escape prevention challenging, use mesh with openings under 0.5mm., specialized diet of live micro‑arthropods (springtails, fruit flies), they will not accept sugar water or dead food., slow colony growth and small final size make any loss of workers or queens hard to recover from., sensitive to drying out, consistent high humidity is required, monitor nest moisture daily., wild‑caught colonies may carry internal mites or parasites that are difficult to treat.

Appearance and Identification

Workers of Strumigenys decipula are just 2.1-2.2mm long ^[1]. The most distinctive features are the very short, broad antennal scape that expands into a large convex lobe, and the tiny eyes, only three ommatidia (individual lens units) in the longest row ^[2]. There are no upright (standing) hairs on the dorsal mesosoma (the middle part of the body), instead, the body is covered with dense, short, spoon‑shaped (spatulate) hairs that lie flat ^[2][1]. The mandibles are elongate and sublinear, and when closed their inner margins meet at about the midlength ^[2]. This species is very close to Strumigenys subedentata but can be told apart by the lack of standing hairs on the dorsal alitrunk, the very broad scape, and the smaller eyes ^[1].

Distribution and Habitat

Strumigenys decipula is known from Brazil (type locality near Manaus), Colombia, Ecuador, and Peru ^[2][3][4]. The wide altitudinal range is notable: in Colombia it has been collected from 300m in lowland Amazon forest (Caquetá) and from 2730m in highland Andean forest (Boyacá) ^[2]. Presumably it lives in rotting wood, leaf litter, and moist soil on the forest floor, typical Strumigenys microhabitats.

Feeding and Diet

Like all Strumigenys, this species is a specialized predator. It uses its trap‑jaw mandibles to capture small arthropods, primarily springtails (Collembola) and other micro‑arthropods found in leaf litter and soil. In captivity you must provide live small prey, they do not accept sugar water, honey, or dead insects. Offer small live springtails as the main food. Fruit flies, tiny crickets, or soil mites may also be taken. Feed every 2-3 days and remove uneaten prey to prevent mold. ^[3]

Temperature and Care

Because the species comes from warm Neotropical forests, keep the temperature stable around 22-26°C. Avoid letting it drop below 20°C or climb above 30°C. If your room is cooler, use a heating cable placed on top of the nest (not underneath) to avoid drying out the substrate. High humidity is critical: aim for a consistently moist nest, the substrate should feel damp but not waterlogged. Monitor humidity daily, especially in dry climates. ^[2]

Nesting Requirements

In the wild they likely nest in rotting wood, leaf litter, or soil. For captive colonies, a small test‑tube setup works well during founding. For larger colonies, use a plaster or Y‑tong nest with chambers scaled to their tiny 2mm size, avoid large, open spaces. Keep the nest material damp. Escape prevention is critical: use mesh with openings no larger than 0.5mm. They can sting, but it is not painful or dangerous.

Colony Development

Nothing has been published about the colony development of this species. Based on overall patterns in Strumigenys, colonies are probably small and grow slowly. The founding method is unconfirmed, there is no evidence for claustral or semi‑claustral behavior. Development time from egg to worker is unknown. Treat this species as a blank slate: observe carefully and adjust care as you learn.

Frequently Asked Questions

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References