Tetramorium pylacum

Tetramorium pylacum

Tetramorium pylacum is a small, dark brown to black ant measuring 3.3-3.7mm in worker length. This species belongs to the Tetramorium genus in the Myrmicinae subfamily and is part of the flabellum-complex group, characterized by relatively broad heads and shorter antennal scapes compared to related species. The species was formally described by Bolton in 1980 based on specimens collected from the Tai Forest in Ivory Coast. Found across West African countries including Cameroon, Central African Republic, Ghana, and Ivory Coast, T. pylacum is a rainforest species that lives primarily in leaf litter environments ^[1]. Workers have distinctive longitudinal rugae on the head and fine costulation at the base of the first gastral tergite, which helps separate them from their closest relative T. saginatum.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: West African rainforest species found in Ivory Coast, Cameroon, Central African Republic, and Ghana. Inhabits leaf litter layers in tropical rainforest environments and has also been recorded as a ground-forager ^[1][2].
• Colony Type: Single-queen colonies (monogyne) based on typical Tetramorium genus patterns. Colony structure has not been directly studied for this specific species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Unconfirmed, queen measurements not documented in available literature
  • Worker: 3.3-3.7mm
  • Colony: Unknown, no colony size data available for this species
  • Growth: Moderate, inferred from typical Tetramorium development patterns
  • Development: 6-10 weeks, estimated based on typical Tetramorium genus development at warm temperatures (Development time is estimated as this species has not been directly studied. Related Tetramorium species typically develop from egg to worker in 6-10 weeks under optimal conditions.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, this West African rainforest species prefers warm, stable temperatures. A heating cable on one side of the nest can create a gentle gradient. Avoid temperatures below 22°C as this species originates from tropical regions.
  • Humidity: High humidity required, rainforest leaf litter species need consistently moist substrate. Keep the nest substrate damp but not waterlogged, with some drier areas available for the ants to regulate their own moisture exposure.
  • Diapause: No, as a tropical rainforest species from West Africa, T. pylacum does not require hibernation. They remain active year-round in captivity.
  • Nesting: In nature, this species nests in leaf litter and soil. In captivity, a naturalistic setup with moist substrate or a Y-tong/plaster nest works well. The small worker size (3.3-3.7mm) means chambers and passages should be appropriately scaled.
• Behavior: Workers are active foragers that search for food on the ground surface. Based on research data showing them as generalist predators ^[3], they likely hunt small insects and arthropods. They may also tend aphids for honeydew. Workers are moderately aggressive when defending the nest but are not particularly large or dangerous. Their small size means escape prevention is important, they can squeeze through small gaps.
• Common Issues: escape prevention is critical due to their small 3-4mm size, use fine mesh and tight-fitting lids, high humidity requirements can lead to mold if ventilation is inadequate, balance moisture with airflow, tropical species may struggle if temperatures drop below 22°C, monitor closely in cooler climates, limited species-specific information means keepers must monitor colony behavior to adjust care

Housing and Nest Setup

For this small rainforest species, a naturalistic setup with moist substrate works well. You can use a mix of soil and organic material to replicate the leaf litter environment they naturally inhabit. Alternatively, a Y-tong (AAC) or plaster nest provides good humidity control and allows you to observe the colony easily. The nest chambers should be appropriately scaled to the tiny 3-3.7mm workers, narrow passages and small chambers help them feel secure. The outworld should include a water source and feeding area. Because of their small size, ensure all connections between nest areas are tight and consider using fluon on rim edges to prevent escapes. ^[1]

Feeding and Diet

Based on research classifying T. pylacum as a generalist predator ^[3], your colony will need a protein-rich diet. Offer small live prey such as fruit flies, pinhead crickets, or mealworms. They will also likely accept honey water or sugar water as an energy source, which is common in the Tetramorium genus. Feed protein prey 2-3 times per week, and keep a constant sugar source available. Remove uneaten prey after 24-48 hours to prevent mold issues. Young colonies may take smaller prey items, start with fruit flies or tiny insects before offering larger prey.

Temperature and Humidity

As a West African rainforest species, T. pylacum needs warm and humid conditions. Maintain temperatures between 24-28°C in the nest area. A heating cable placed on top of the nest (never underneath where it can dry out the substrate) can help maintain warmth, especially in cooler rooms. Humidity should be high, keep the substrate consistently moist but not saturated. The substrate should feel damp to the touch. Mist the nest occasionally but allow it to dry slightly between misting to prevent stagnant conditions. Good ventilation is essential to prevent mold while maintaining humidity. ^[1]

Colony Development

The founding process for this species has not been directly documented, but based on typical Tetramorium behavior, the queen will likely seal herself in a small chamber and raise her first workers (nanitics) alone on stored fat reserves. This is called claustral founding. Expect the first workers to emerge 6-10 weeks after founding under optimal warm conditions, though this is an estimate based on related species. Nanitics will be smaller than normal workers. Growth rate is moderate, the colony will expand gradually as more workers hatch. A healthy established colony may eventually reach several hundred workers, though exact maximum size is unknown for this species.

Behavior and Temperament

Workers are active foragers that search the outworld for food. They are not particularly aggressive toward humans but will defend their nest vigorously if threatened. The small worker size (3.3-3.7mm) means they can escape through tiny gaps, excellent escape prevention is essential. Workers likely use chemical trails to recruit nestmates to food sources, a common behavior in Tetramorium species. The colony will establish defined foraging patterns once they settle into your setup. They are primarily ground-dwellers and do not climb well, so focus escape prevention on the lower portions of the setup. ^[1]

Frequently Asked Questions

References