Philidris cordata

Philidris cordata

Philidris cordata is a medium-sized Dolichoderinae ant native to the Australasian and Indomalaya regions, including New Guinea, Indonesia, and Singapore. Workers are slender with a distinctive dark coloration and measure around 4-6mm. This species forms large colonies that create extensive trunk trails and semi-carton nest structures on tree trunks and at the base of trees. They are strongly associated with ant-plants like Myrmecodia beccarii, where they occupy domatium chambers. Unlike true ant-garden species, P. cordata is a secondary resident that opportunistically uses these plants. These ants are highly abundant and dominant in their range, capable of displacing other ant species including invasive ones in agricultural settings.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to New Guinea, Indonesia (Sulawesi, Aru Islands), and Singapore. Found in young secondary habitat, disturbed scrub in parks, abandoned plantation forests, and occasionally primary forest and mangroves. Nests in fallen twigs, behind bark of dead trees, and builds semi-carton nest extensions on tree trunks ^[1].
• Colony Type: Large colonies with extensive trunk trail systems. Multiple queens likely based on the semi-carton satellite nest structures and pervasive colony networks observed. Colony structure is not fully documented in scientific literature.
  • Colony: Polygyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 6-8mm based on genus typical sizes
  • Worker: Estimated 4-6mm based on genus typical sizes
  • Colony: Large colonies, dominant in cacao agroforestry with colonies spanning multiple trees ^[2]
  • Growth: Moderate, fast once established
  • Development: Estimated 6-8 weeks at tropical temperatures based on related Dolichoderinae (Development timeline is inferred from genus patterns, not directly studied for this species)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This is a tropical species from warm, humid regions of New Guinea and Indonesia. A heating cable on one side of the nest creates a suitable gradient ^[3] (related species thermal studies).
  • Humidity: Keep at 70-80% humidity. These ants naturally inhabit humid tropical forest environments and are associated with ant-plants that provide moist domatium chambers. Mist the outworld regularly and keep nest substrate damp but not waterlogged ^[1].
  • Diapause: No, this is a tropical species that does not require hibernation. Maintain year-round warm conditions ^[1].
  • Nesting: Provide a naturalistic setup with multiple chambers or a Y-tong/plaster nest. In nature they nest in fallen twigs, behind bark, and build semi-carton structures on trees. They prefer enclosed spaces with some vertical height for their trunk trail systems. Avoid dry, arid setups, they need moisture ^[1].
• Behavior: Nocturnal foragers, they are classified as a nocturnal ant species ^[3]. Workers create extensive trunk trails made of semi-carton material on tree trunks. They are highly territorial and aggressive toward other ant species, capable of displacing invasive ants. They tend honeydew-producing insects and are associated with ant-plants. Escape prevention is important, use standard barriers as workers are medium-sized ^[2].
• Common Issues: colonies can be aggressive toward other ant species, keep isolated from other ant colonies, nocturnal activity means you may not see much during daylight hours, this is normal, large colony size requires significant space as colonies expand, tropical humidity requirements can lead to mold if ventilation is poor, semi-carton nest building may damage naturalistic setups over time

Nest Preferences and Housing

Philidris cordata naturally nests in fallen twigs, behind bark of dead trees, and builds semi-carton nest extensions on tree trunks. In captivity, they do well in Y-tong (acrylic) nests or plaster nests with multiple chambers. The semi-carton material they create in the wild suggests they do best with some organic material or textured surfaces they can work with. A naturalistic setup with a formicarium connected to an outworld works well. They need vertical space to accommodate their trunk trail behavior. Keep the nest humid but ensure good ventilation to prevent mold. Test tubes can work for founding colonies but will need upgrading as the colony grows ^[1].

Feeding and Diet

Like most Dolichoderinae ants, P. cordata is omnivorous with a preference for sugar sources. They will readily accept sugar water, honey, or diluted syrup. They also forage for protein, offer small insects like fruit flies, mealworms, or crickets. In their natural habitat, they tend honeydew-producing insects and associate with ant-plants. Feed sugar water constantly and protein prey 2-3 times per week. Remove uneaten prey after 24 hours to prevent mold. They are nocturnal, so offering food in the evening hours may increase feeding activity ^[3][2].

Temperature and Seasonal Care

As a tropical species from New Guinea and Indonesia, P. cordata requires warm temperatures year-round. Keep the nest area at 24-28°C. A heating cable on one side of the nest creates a gentle gradient while avoiding overheating. They do not require hibernation or diapause, maintaining consistent tropical conditions is key. Avoid temperatures below 20°C for extended periods. Room temperature in most homes (22-26°C) is often suitable, but monitor colony activity to ensure they are comfortable. They are adapted to high humidity environments, so misting the outworld regularly helps maintain appropriate conditions ^[3][1].

Behavior and Colony Dynamics

This species is nocturnal, meaning they are most active at night. Workers create extensive trunk trails made of semi-carton material, this is a distinctive behavioral trait. They are highly aggressive toward other ant species and can displace invasive ants, making them ecologically dominant in their range. Colonies appear to have multiple queens based on the extensive satellite nest systems they build. They are associated with ant-plants like Myrmecodia beccarii, occupying the domatium chambers in a mutualistic relationship. Workers will tend aphid colonies for honeydew. The semi-carton nest building can cause wear on naturalistic setups over time ^[1][2][3].

Ant-Plant Association

Philidris cordata is commonly found in association with the ant-plant Myrmecodia beccarii. The ants occupy the domatium (chambered tubers) of this plant, which provides shelter. This is a mutualistic relationship, the plant gets protection from herbivores while the ants get housing and likely nutrients from plant secretions. While not a true ant-garden species that initiates gardens, P. cordata is a secondary resident that opportunistically uses ant-gardens. In captivity, you could potentially keep them with compatible ant-plants, though this is not necessary for successful husbandry ^[4][5].

Growth and Development

Colony growth is moderate to fast once established. Founding colonies start with a single claustral queen who seals herself in and raises the first workers (nanitics) on stored body fat. The first workers are typically smaller than normal workers. Based on related Dolichoderinae, expect 6-8 weeks from egg to first worker at optimal tropical temperatures. Mature colonies can become very large, with thousands of workers spanning multiple nest sites. They are known to be highly abundant and dominant in agricultural landscapes like cacao agroforestry in Sulawesi, indicating strong colony growth potential ^[2][6].

Frequently Asked Questions

References