Nylanderia coveri

Nylanderia coveri

Nylanderia coveri is a tiny ant species recently described in 2019,native to the island of Grenada in the West Indies. Workers measure just 1.98-2.13mm, making them one of the smaller ant species kept in captivity ^[1]. They have a distinctive bright yellow body with sharply contrasting dark brown macrosetae (stiff hairs) across their body, which sets them apart from the similar and more widespread N. guatemalensis that never reaches this bright yellow coloration ^[1][2]. The entire body including the legs and coxae is uniformly yellow, whereas N. guatemalensis has lighter-colored middle legs even in yellow specimens ^[1]. This species was discovered in a nutmeg-banana plantation, nesting in a rotten stick partly buried in leaf litter in shaded areas ^[1][3].

This is one of the newest ant species to enter the hobby, having only been formally described in 2019. As a recently described species endemic to Grenada, captive breeding and care requirements are not yet well-documented. What makes this species interesting is its low elevation distribution, most native West Indian ant species are found at moderate to high elevations, but N. coveri is an exception found below 400 meters ^[2][4]. It belongs to the N. guatemalensis species complex and is closely related to N. steinheili ^[2][4].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Grenada in the West Indies. Found at low elevations below 400m in nutmeg-banana plantations, nesting in rotting wood partly buried in leaf litter in shaded areas ^[1][2][4].
• Colony Type: Colony structure is unconfirmed. Based on genus patterns, likely single-queen (monogyne) colonies, though some Nylanderia species can be multi-queen ^[3].
• Size & Growth:
  • Queen: Undescribed, queen morphology not yet documented in original species description ^[1]
  • Worker: 1.98-2.13 mm total length ^[1]
  • Colony: Unknown, likely similar to related species at several hundred workers maximum
  • Growth: Unknown, likely moderate based on small worker size and genus patterns
  • Development: Estimated 6-8 weeks at optimal temperature based on genus patterns for small tropical ants (Direct development data unavailable for this species. Estimates based on typical Nylanderia development patterns.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a lowland tropical species from Grenada, they prefer warm conditions. A gentle gradient allowing workers to self-regulate is ideal ^[2]
  • Humidity: Keep moderately humid (60-80%). Their natural habitat in leaf litter and rotting wood provides humid microclimates. Provide a moist nest substrate but avoid waterlogging ^[1]
  • Diapause: Likely no true diapause. As a tropical species from Grenada near the equator, they probably do not require a hibernation period. Maintain warm conditions year-round ^[2]
  • Nesting: Provide a naturalistic setup with moist substrate, leaf litter, and small cavities. They naturally nest in rotting wood and leaf litter in shaded areas. A Y-tong or plaster nest with small chambers works well. Avoid dry, exposed conditions ^[1]
• Behavior: Nylanderia are known as 'crazy ants' due to their erratic, rapid movement patterns. Workers are small and very active, foraging continuously. They are not aggressive and lack a functional stinger, though their small size means they can escape through tiny gaps. Escape prevention is critical, use fine mesh and tight-fitting barriers. They are omnivorous, feeding on honeydew, small insects, and will accept sugar water. Colony activity will increase with warmer temperatures ^[3].
• Common Issues: very small size means escapes are likely without fine mesh barriers, limited availability as a recently described species, may be difficult to source, no established captive breeding protocols yet, expect a learning curve, wild-caught colonies may carry parasites or diseases not yet understood, tropical species requires consistent warmth year-round

Housing and Nest Setup

Nylanderia coveri is a ground-dwelling species that naturally nests in rotting wood and leaf litter in shaded, humid areas. For captivity, provide a naturalistic setup with a moist substrate that can hold humidity, a mix of soil and organic material works well. You can include pieces of rotting wood or cork bark to simulate their natural nesting sites. Alternatively, a Y-tong (acrylic) nest with small chambers and a water reservoir works well for small species. Because they are tiny (under 2.5mm), ensure all connections and barriers are secure. Use fine mesh on any ventilation holes, these ants can squeeze through gaps that seem impossibly small. Provide an outworld area for foraging that allows you to offer food and watch their activity. ^[1][3]

Feeding and Diet

Like other Nylanderia species, N. coveri is omnivorous and will accept a variety of foods. In captivity, offer sugar water or honey as a constant energy source, these ants have a high metabolic rate due to their small size and constant activity. For protein, provide small live prey such as fruit flies, pinhead crickets, or other tiny insects. They will also scavenge on dead insects. Based on their natural habitat in banana plantations, they likely feed on honeydew from aphids and scale insects, so sugar sources are definitely accepted. Feed protein prey 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24 hours to prevent mold. ^[3]

Temperature and Humidity

As a tropical species from Grenada, Nylanderia coveri requires warm and humid conditions. Keep the nest area at 24-28°C, this is warmer than many temperate species need. You can use a heating cable on one side of the nest to create a gentle temperature gradient, allowing workers to move between warmer and cooler areas. Maintain humidity at 60-80% by keeping the substrate moist but not waterlogged. The leaf-litter habitat they naturally occupy stays consistently humid. Mist the nest occasionally or use a water reservoir connected to the nest to maintain moisture. Unlike temperate species, they do not require a winter dormancy period, maintain warm conditions year-round. ^[1][2][4]

Colony Development

Since this species was only described in 2019,there is limited data on captive colony development. Based on their small worker size (under 2.5mm) and tropical origin, expect relatively fast development compared to larger temperate species. The first workers (nanitics) will likely be smaller than mature workers. Estimate 6-8 weeks from egg to first worker at optimal temperature, though this is based on genus patterns rather than species-specific data. Colonies likely reach several hundred workers at maturity, similar to related Nylanderia species. Be patient, small ant species often have longer founding phases than larger species. The queen will lay eggs continuously once established, and colony growth should be steady once the first workers emerge. ^[1][2]

Behavior and Temperament

Nylanderia species are known for their 'crazy ant' behavior, rapid, erratic movement that can seem chaotic compared to more deliberate ant species. Workers are constantly active, foraging and exploring their environment. They are not aggressive toward keepers and cannot sting effectively due to their small size. However, their tiny size means they are excellent escape artists, always use multiple barriers and fine mesh. Colonies are likely to be skittish, retreating into the nest if disturbed. They probably use chemical trails to recruit nestmates to food sources, so you may see chains of workers following each other. Provide enrichment such as leaf litter and small hiding spots to encourage natural behaviors. ^[3]

Frequently Asked Questions

References