Platythyrea strenua

Platythyrea strenua

Platythyrea strenua is a medium-sized ponerine ant native to the island of Hispaniola (Haiti and Dominican Republic). Workers measure 8-8.5mm and have a robust, stocky build with a distinctive black body. The mandibles, clypeus, antennae, leg joints, and tip of the abdomen show reddish tinges, giving them a subtle two-tone appearance. The body is covered in fine punctures and a yellowish-gray pubescence that gives a slightly dusty look ^[1].

This species is notable for being a high-elevation ant found only in pine forests at 1,200-1,500m altitude. Unlike many tropical ants, they nest in cool, damp microhabitats under limestone slabs and in rotting wood, often near termite colonies. Their limited distribution makes them one of the rarer Caribbean ant species ^[2][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Hispaniola, found only in Haiti (type locality at Diquini) and the Dominican Republic (Sierra de Baoruco). They live in high-elevation pine forests (Pinus occidentalis) at 1,200-1,500m altitude, nesting under limestone slabs and in rotting wood near termite colonies ^[2][3].
• Colony Type: Colony structure is unconfirmed. Based on typical Platythyrea patterns, likely single-queen colonies. The type collection came from a small colony, suggesting modest colony sizes ^[2][3].
• Size & Growth:
  • Queen: Unknown, not directly described in available literature. Estimated 10-12mm based on genus patterns for robust ponerines.
  • Worker: 8-8.5mm ^[1]
  • Colony: Likely small to moderate, field collections noted 'small colonies' ^[2]. Estimated under 500 workers based on related species.
  • Growth: Moderate, inferred from typical Ponerinae development patterns.
  • Development: Estimated 6-10 weeks at optimal temperature based on genus-level data for Ponerinae. (Development time is estimated from related ponerine ants. Specific data for this species is unavailable.)
• Antkeeping:
  • Temperature: Keep cooler than typical tropical ants due to high-elevation origin. Aim for 18-22°C, with a gentle gradient allowing workers to self-regulate. Avoid overheating, they naturally occur in cool mountain forests ^[2][3].
  • Humidity: Moderate to high humidity (60-80%). Their natural habitat under limestone slabs and in rotting wood is damp but not waterlogged. Keep nest substrate consistently moist but provide some drier areas for foraging space.
  • Diapause: Likely yes, given their high-elevation origin and the seasonal nature of the Dominican Republic highlands, expect a mild winter slowdown period. Reduce temperature to 15-18°C for 2-3 months during winter months.
  • Nesting: Prefers damp, dark nesting sites. In captivity, a naturalistic setup with moist substrate (soil/peat mix) works well, or a Y-tong/plaster nest with moisture chambers. They accept tight chambers scaled to their robust size. Keep nesting area dark and undisturbed.
• Behavior: Platythyrea strenua is a predatory ponerine ant with moderate activity levels. Workers forage on the ground surface and are likely to accept small live prey. They are not aggressive toward keepers but have a functional stinger, expect defensive stinging if provoked. Escape risk is moderate due to their size, standard barrier methods work well. They are not known escape artists. Colonies are likely peaceful and not territorial toward conspecifics.
• Common Issues: high-elevation origins mean they are sensitive to overheating, keep them cool, small colony sizes in the wild suggest colonies may be slow to establish and vulnerable during founding, damp nesting conditions can lead to mold if ventilation is poor, their rarity means wild-caught colonies may have limited genetic diversity, they may be difficult to find as they are not common in the antkeeping trade

Natural History and Distribution

Platythyrea strenua is one of the rarest ant species in the Caribbean, known only from the island of Hispaniola. The original type collection was made in Diquini, Haiti in 1912-1913 from a rotten log situated near a termite colony. After this initial discovery, the species was not recorded again until 1975 when two separate colonies were found in the Sierra de Baoruco mountains of the Dominican Republic at elevations between 1,200-1,500 meters ^[2][3].

These high-elevation pine forest habitats are notably cooler than lowland tropical areas. The colonies were found nesting under limestone slabs in areas where Pinus occidentalis (Hispaniolan pine) dominates, with Gnaphalium and related plants in the understory. This suggests P. strenua is a cool-adapted species that prefers damp, shaded microhabitats typical of mountain forests ^[2][3].

Housing and Nest Setup

For keeping Platythyrea strenua successfully, replicate their natural cool, damp habitat. A naturalistic setup with a soil/peat substrate mixture works well, keep it consistently moist but not waterlogged. A Y-tong (acrylic) nest with moisture chambers is also suitable, as it allows you to maintain humidity while still being able to observe the colony.

Given their high-elevation origins, avoid overheating. Room temperature (18-22°C) is ideal, they will struggle if kept above 25°C. Place the nest in a cool, dark location away from direct sunlight and heat sources. Provide a temperature gradient so workers can choose their preferred zone. Because they are ground-nesting ants, keep the nesting area dark and minimize disturbances during the founding stage ^[2][3].

Feeding and Diet

As a member of the Ponerinae subfamily, Platythyrea strenua is likely a predatory ant that hunts small invertebrates. In captivity, offer small live prey such as fruit flies, pinhead crickets, mealworms, and other appropriately-sized insects. Feed protein prey 2-3 times per week, removing any uneaten prey after 24 hours.

Sugar sources may be accepted, you can offer a drop of honey or sugar water occasionally, though ponerines are typically less interested in sweets than formicines. Always provide fresh water. Since colonies in the wild were found near termite colonies, they may have a particular affinity for termite prey, this could be an interesting food to experiment with if available ^[1].

Temperature and Seasonal Care

Temperature management is the most critical factor for keeping this species healthy. Their native habitat at 1,200-1,500m elevation means they are adapted to cooler conditions than most tropical ants. Keep the nest area between 18-22°C year-round. During winter months in the Northern Hemisphere (roughly November through February), expect natural slowing of activity and reduce temperatures slightly to 15-18°C.

This winter rest period likely mimics their natural cycle in the Dominican highlands, where cooler temperatures prevail during the dry season. Do not attempt to maintain active growth year-round, allow the colony to rest. Overheating is the primary killer of this species in captivity, so monitor temperatures carefully and provide ventilation to prevent heat buildup ^[2][3].

Colony Establishment and Growth

P. strenua colonies appear to be small in the wild, field collectors noted 'small colonies' rather than the large supercolonies seen in some ant species. This means you should expect slower growth than species like Camponotus or Formica. A founding queen will likely take 6-10 weeks to produce her first workers (nanitics), and the colony may remain under 100 workers for the first year.

Be patient during the founding stage. Provide the queen with a dark, humid test tube setup and do not disturb her. Once workers emerge, growth should be steady but modest. The key to success is providing stable, cool conditions and consistent (but not excessive) feeding. Small colony size also means each individual is valuable, avoid excessive disturbances that could stress the colony ^[2][3].

Frequently Asked Questions

References