Cryptopone gilva

Cryptopone gilva - "Southern Pit-jawed Ant"

Cryptopone gilva is a small reddish-brown to yellowish ant (workers 2.8-4mm) native to the southeastern United States through Central America ^[1]. They belong to the Ponerinae subfamily and are known for their slow movement and tendency to feign death when disturbed ^[2]. These ants nest in rotting logs and under loose bark, typically in forests at elevations ranging from sea level to 2000 meters. Colonies are relatively small, usually containing a few dozen to several hundred workers, and can be polygynous with multiple queens ^[3][1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southeastern United States through Central America, found in forests, cloud forests, and disturbed urban areas from sea level to 2000m elevation ^[1][2]. Nests in rotten logs or under bark on the forest floor in areas with rocky loam soils ^[2].
• Colony Type: Polygynous, colonies can have multiple queens (often up to 10 dealate queens) and several hundred workers ^[3][2]. Lone founding queens are commonly encountered in the wild ^[1].
  • Colony: Polygyne
• Size & Growth:
  • Queen: Slightly over 4mm ^[2]
  • Worker: 2.8-4mm ^[2]
  • Colony: A few dozen to several hundred workers ^[3][2]
  • Growth: Slow, development takes approximately 11-12 weeks from egg to first worker
  • Development: 11-12 weeks (approximately 77-86 days) at 23°C ^[2] (Egg stage ~30 days, larval stage ~25 days, pupal stage ~32 days for workers (36 days for males) at 23°C)
• Antkeeping:
  • Temperature: Keep around 22-24°C based on documented development at 23°C ^[2]
  • Humidity: High humidity required, they naturally live in moist rotting wood. Keep nest substrate consistently damp but not waterlogged.
  • Diapause: Not clearly documented, given their range extending into temperate areas (southern US), a mild winter cool period (15-18°C for 2-3 months) may benefit colonies but is likely not strictly required.
  • Nesting: Naturalistic setup works best, rotting wood, bark sections, or a Y-tong/plaster nest with high humidity. They prefer tight spaces similar to their natural nesting in bark humus layers ^[1].
• Behavior: Slow-moving and docile. Workers feign death (thanatosis) when disturbed ^[2]. Predatory by nature but will accept protein foods like meat and insects in captivity, plus fruit and honey ^[2]. Workers occasionally forage briefly on the ground surface but are primarily nest-dwelling. Escape risk is moderate, use standard barrier methods.
• Common Issues: high humidity needs can lead to mold if ventilation is poor, slow growth may frustrate beginners expecting quick colony development, colonies are small even at maturity, don't expect large numbers, wild-caught colonies may have parasites, they feign death making it easy to overlook workers during nest checks

Nest Preferences

Cryptopone gilva naturally nests in rotting logs and under loose bark on the forest floor. They prefer wood that is still solid but with loose bark and a thin layer of decayed humus between the bark and wood ^[1]. In captivity, a naturalistic setup with pieces of rotting wood or bark works well. A Y-tong (acrylic) nest or plaster nest with high humidity also suits them. They do best in tight chambers that mimic the narrow tunnels they create in the humus layer under bark. Avoid dry conditions, these ants need consistent moisture ^[1].

Feeding and Diet

In the wild, workers are predatory and hunt small invertebrates ^[2]. However, they readily accept a variety of foods in captivity. Haskins (1931) documented that they accept meat, fruit, and honey in artificial nests ^[2]. Feed them small protein sources like fruit flies, small crickets, or mealworm pieces twice weekly. Sugar water or honey can be offered as a supplement. Fresh fruit (especially sweet fruits) is often accepted. Remove uneaten food after 24-48 hours to prevent mold.

Temperature and Care

Keep the nest at around 22-24°C. The documented development study was conducted at 23°C, so this is a reliable target ^[2]. A heating cable on one side of the nest can create a gentle gradient if your room temperature runs cool. These ants come from warm climates but can tolerate brief cool periods. Given their range into the temperate US Southeast, a mild winter rest at 15-18°C for 2-3 months may be beneficial but is not strictly required. Monitor colony activity, if workers become sluggish and cluster together, they may be too cool.

Behavior and Temperament

Cryptopone gilva is a docile, slow-moving species. When disturbed, workers feign death by remaining motionless, this is a natural defense mechanism called thanatosis ^[2]. They are not aggressive and rarely bite. Workers are primarily nest-dwelling but can occasionally forage briefly on the ground surface ^[3]. They are not escape artists but standard barrier methods like Fluon should still be used. Colonies remain relatively small even when mature, typically maxing out at a few hundred workers.

Growth and Development

Haskins (1931) documented detailed development at 23°C: eggs hatch after about 30 days, larvae develop for approximately 25 days, and pupae require about 32 days (workers) or 36 days (males). This totals roughly 77-86 days from egg to adult worker ^[2]. Newly hatched larvae are immediately moved to a separate chamber from the eggs, likely to prevent cannibalism. Workers cover mature larvae with soil before they spin cocoons. The cocoon stage lasts about 19 hours for spinning, then workers uncover and clean them. Callows (newly emerged workers) remain helpless for about a day before participating in nest duties and begin foraging after 21 days when they are still light in color ^[2].

Frequently Asked Questions

References