Polyrhachis reclinata

Polyrhachis reclinata

Polyrhachis reclinata is a medium-large arboreal ant species native to the lowland rainforests of southern New Guinea and northern Australia (Cape York Peninsula). Workers measure 11-14mm and have a distinctive black body with reddish-brown propodeum and petiole, covered in dense golden or brassy pubescence. They belong to the sexspinosa species-group within the subgenus Myrmhopla and are identified by their long, curved propodeal spines and weakly developed occipital lobes. Unlike many ground-nesting ants, these ants are arboreal nesters, typically colonizing hollow bamboo internodes in monsoon rainforest ^[1][2].

What makes P. reclinata special is their silk-weaving behavior. Like other Myrmhopla species, they use larval silk to construct protective nest structures in tree hollows and bamboo. This arboreal lifestyle means they need completely different housing than typical soil-nesting ants, think vertical spaces with climbing opportunities rather than horizontal nest chambers ^[3][4].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Lowland rainforest along the Gulf of Papua (Fly River delta, lower Busu River, Port Moresby area, Daru Island) and northern Australia (Queensland, from Lockerbie Scrub south to Iron Range). They inhabit monsoon rainforest and nest primarily within hollow internodes of bamboo (Bambusa forbesii) ^[1][2].
• Colony Type: Colony structure is unconfirmed. Most Polyrhachis species establish single-queen colonies, but specific data for P. reclinata is lacking.
• Size & Growth:
  • Queen: 13.55-14.46mm ^[1][2]
  • Worker: 11.44-14.31mm ^[1][2]
  • Colony: Unknown, likely several hundred workers based on related species
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal tropical temperatures (based on typical Polyrhachis development patterns) (Tropical species, faster development than temperate ants. Direct measurements not available for this species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, they are tropical rainforest ants requiring warm, stable conditions. A gentle gradient allowing them to move between warmer and cooler areas is ideal ^[1].
  • Humidity: High humidity (70-85%) is essential. Their natural habitat is lowland rainforest with constant moisture. Keep nest substrate consistently damp but not waterlogged. Mist regularly and provide a water source ^[1].
  • Diapause: No, as a tropical species from lowland rainforest, they do not require hibernation. Keep temperatures stable year-round ^[1].
  • Nesting: Arboreal specialists, they nest in hollow bamboo, tree hollows, and similar vertical spaces. In captivity, provide a vertical formicarium or custom bamboo setup with narrow chambers (8-12mm) and multiple connecting chambers. They use silk to seal gaps and create partitions. Avoid horizontal soil nests, these ants will not thrive in typical dirt setups ^[3][4][5].
• Behavior: P. reclinata is generally calm and not aggressive toward keepers. Workers are active foragers, patrolling vegetation and tree bark in search of honeydew and small insects. They are excellent climbers and will readily traverse vertical surfaces. Escape prevention is important, while not tiny, they are agile climbers that can escape through small gaps. They are primarily nocturnal or crepuscular, becoming more active in dim light. Their silk-weaving behavior means they may construct barriers within their enclosure ^[3][4].
• Common Issues: arboreal nesting requirements mean standard soil formicariums are unsuitable, they need vertical spaces, high humidity needs can lead to mold problems if ventilation is poor, tropical temperature requirements mean they cannot tolerate cool rooms, silk-weaving behavior may cause them to block connections or seal themselves into chambers unexpectedly, wild-caught colonies may carry parasites or diseases from their native habitat

Housing and Nest Setup

P. reclinata requires arboreal-style housing that mimics their natural bamboo-nesting habitat. Standard horizontal formicariums with soil substrates will not work, these ants need vertical spaces. The best options include: custom acrylic vertical nests with narrow chambers (8-12mm wide), bamboo sections with internal partitions, or DIY setups using cardboard tubes that simulate hollow bamboo internodes. The nest should have multiple chambers connected by small passages, allowing the colony to distribute brood throughout. Because they use silk, provide materials they can work with, small pieces of tissue or cotton can be added for nesting material. The outworld should include climbing structures like twigs, cork bark, or artificial plants since they naturally forage on vegetation ^[3][4][5].

Feeding and Diet

Like most Polyrhachis species, P. reclinata is omnivorous. They feed on honeydew from sap-sucking insects (aphids, scale insects, mealybugs) in nature, along with small insects and nectar. In captivity, offer sugar water or honey as a constant energy source. For protein, provide small insects like fruit flies, small crickets, mealworms, or waxworms. Feed protein 2-3 times per week, adjusting based on colony size. Fresh fruit can also be offered occasionally. Remove uneaten protein after 24-48 hours to prevent mold. Because they are arboreal foragers, place food on elevated surfaces or platforms in the outworld rather than on the floor ^[6].

Temperature and Humidity Management

As tropical rainforest ants, P. reclinata needs warm and humid conditions year-round. Maintain temperatures between 24-28°C using a heating cable or mat on one side of the nest (never directly on the nest material as it can dry them out). Room temperature alone is often insufficient in cooler climates. Humidity should stay at 70-85%, use a water reservoir in the nest, mist regularly, and ensure the setup is not in a dry environment. However, balance humidity with adequate ventilation to prevent mold. A hygrometer helps monitor conditions. If the colony clusters near the heat source, temperatures are good, if they avoid it, increase slightly. Watch for condensation, light condensation is normal, excessive moisture is not ^[1][2].

Silk Weaving Behavior

One of the most fascinating aspects of P. reclinata is their silk-weaving ability. Like all Myrmhopla species, they use larval silk to construct and modify their nests. Workers manipulate larvae to produce silk, which is then used to create barriers, seal chamber entrances, and construct protective structures within bamboo hollows or tree cavities. In captivity, you may observe this behavior as they seal off sections of their nest or create silk partitions. This is normal and not a cause for concern, do not interfere with their silk constructions. You can support this behavior by providing small amounts of suitable material like cotton fibers or tissue paper pieces in the nest area ^[3][4][5].

Colony Founding and Growth

Queens are large (13.55-14.46mm) and likely claustral, sealing themselves in a chamber to raise the first brood alone using stored fat reserves. After the first workers (nanitics) emerge, the colony grows gradually. Expect 6-8 weeks from egg to first worker at optimal temperatures. Growth rate is moderate, faster than temperate species but not as rapid as some tropical specialists. Colonies likely reach several hundred workers over time based on related species patterns. Do not disturb the queen during founding, stress can cause her to abandon or eat the brood. Once workers are established, you can offer food but keep disturbances minimal ^[1][2].

Frequently Asked Questions

References