Strumigenys covina

Strumigenys covina

Strumigenys covina is a tiny predatory ant species native to Madagascar, measuring just 3mm in total length ^[1]. Workers have a dull yellowish-brown coloration and belong to the Strumigenys scotti group, specifically the chroa-complex. You can identify them by the lamellate (thin, plate-like) upper scrobe margin and the slender filiform hairs on their pronotal humerus, petiole, postpetiole, and first gastral segment ^[1]. These ants inhabit rainforest environments where they live in rotting wood, leaf litter, and decaying stumps ^[1]. As predators, they specialize in hunting small prey like springtails using their specialized mandibles.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Madagascar, specifically the Malagasy region. They live in humid rainforest habitats at elevations ranging from 425m to 1240m, found in rotting logs, leaf litter, and decaying stumps ^[2][1].
• Colony Type: Likely monogyne (single queen colony) based on typical Strumigenys patterns. Colony size is unknown but likely small, related species typically have colonies under 100 workers.
• Size & Growth:
  • Queen: Unconfirmed, likely around 4-5mm based on genus patterns
  • Worker: 3.0mm total length (HL 0.74,HW 0.53,SL 0.44) ^[1]
  • Colony: Unknown, likely under 100 workers based on related species
  • Growth: Slow
  • Development: Unknown, estimated 8-12 weeks based on related Strumigenys species at warm temperatures (Development is likely slow, typical of dacetine ants. Temperature-dependent, warmer temperatures accelerate development.)
• Antkeeping:
  • Temperature: Keep around 22-26°C. They inhabit humid rainforest environments and prefer stable, warm conditions ^[2]. A gentle gradient with a heating cable on one side allows workers to regulate their temperature.
  • Humidity: High humidity is essential, think damp forest floor. Keep the nest substrate consistently moist but not waterlogged. These ants are terricolous (ground-dwelling) and prefer humid conditions ^[3]. Provide a water tube for drinking access.
  • Diapause: Likely minimal or no true diapause, being a tropical species from Madagascar, they probably do not require hibernation. However, a slight reduction in temperature during winter months may be beneficial.
  • Nesting: In captivity, they do well in naturalistic setups with moist substrate or in Y-tong/plaster nests that retain humidity. They naturally nest in rotting wood and leaf litter, so provide a substrate that stays damp.
• Behavior: These ants are peaceful and not aggressive. They are slow-moving predators that hunt small prey, primarily springtails and other micro-arthropods. Workers are tiny (3mm) and have good escape abilities, use fine mesh and excellent escape prevention. They are not territorial and typically flee rather than engage threats. Foraging occurs on vegetation and through the substrate.
• Common Issues: slow growth can frustrate beginners, colonies take a long time to establish, tiny size means escapes are likely without fine mesh barriers, high humidity requirements can lead to mold problems if ventilation is poor, predatory diet means they need live prey, they cannot survive on sugar alone, wild-caught colonies may have parasites that kill them in captivity

Housing and Nest Setup

Strumigenys covina does well in naturalistic setups that mimic their natural habitat of rotting wood and leaf litter. Use a moist substrate mixture that retains humidity, a blend of soil, sand, and decaying organic material works well. Alternatively, a Y-tong (AAC) nest or plaster nest with a water reservoir maintains the humidity levels they need. Because they are tiny, ensure all connections between the outworld and nest are tight-fitting. A small outworld works best since these ants are small and don't travel far from the nest. Add some small decorations like twigs or leaves to give them foraging opportunities ^[1].

Feeding and Diet

These ants are specialized predators that hunt small live prey. Their primary food should be springtails (collembola), this is their natural prey in the wild and they will readily accept them. Other small live prey like micro-arthropods, tiny beetles, and fruit fly larvae can also be offered. They are not attracted to sugar sources like honey or sugar water, being strict predators, they rely entirely on protein. Feed them small prey items 2-3 times per week, adjusting based on colony size and consumption. Remove any uneaten prey after 24 hours to prevent mold. A constant water source is essential, a small water tube or damp cotton ball works well ^[1].

Temperature and Humidity

Maintain temperatures between 22-26°C for optimal colony health and development. These rainforest ants prefer stable, warm conditions without major temperature fluctuations. A heating cable on one side of the nest creates a gentle gradient that lets workers choose their preferred temperature. Humidity is critical, keep the nest substrate consistently moist but not waterlogged. The substrate should feel damp to the touch. In naturalistic setups, mist the enclosure regularly and ensure the water tube is always filled. Poor humidity leads to desiccation and colony loss. However, balance humidity with adequate ventilation to prevent mold growth ^[3][2].

Colony Establishment and Growth

Strumigenys colonies grow slowly, which is typical for dacetine ants. A newly mated queen will seal herself in a small chamber and raise her first workers (nanitics) alone on her stored fat reserves. The first workers are typically smaller than mature workers and may take several months to appear. After the first workers emerge, the colony grows gradually, expect only a few workers per month initially. Patience is essential with this species. Do not disturb the queen during founding, stress can cause her to abandon or eat her brood. Once established, colonies may eventually reach dozens of workers, though exact maximum size is unknown for this species ^[1].

Behavior and Temperament

These ants are peaceful and not aggressive toward keepers. When threatened, they are more likely to flee than to defend. Workers move slowly and methodically as they search for prey. They do not have a functional stinger, being in the tribe Attini, they rely on their mandibles for defense and prey capture. Their small size (3mm) means they can easily slip through gaps in standard formicarium setups. Always use fine mesh and check for gaps when housing this species. They are primarily ground-dwelling but have been observed foraging on vegetation in the wild ^[1].

Frequently Asked Questions

References