Simopone sicaria

Simopone sicaria

Simopone sicaria is a small predatory ant species native to Madagascar, belonging to the Dorylinae subfamily. Workers measure 1.60-2.10mm in head length and are uniformly black with blackish-brown to black appendages, though the clypeus typically shows a dull reddish coloration ^[1]. This species is a specialized predator that raids the nests of other ant species, demonstrating remarkable efficiency in its hunting behavior. The species was formally described in 2012 by Bolton and Fisher and is classified within the emeryi species group ^[1].

What makes S. sicaria particularly fascinating is its predatory specialization, this species is an obligate predator that conducts raids on other ant colonies. Researchers observed a raid on an arboreal nest of Terataner alluaudi that was completed in under 20 minutes, with workers moving rapidly through tree branches to reach the target nest ^[1]. This raiding behavior, typical of Dorylinae ants, makes them a unique and challenging species to keep, as they require a constant supply of live ant brood as prey.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Simopone sicaria is found exclusively in Madagascar, specifically in rainforest habitats. The type specimen was collected from a rotten stick on the ground in a rainforest at 875m elevation in the Anjanaharibe-Sud Reserve ^[1][2].
• Colony Type: Unknown, colony structure has not been documented for this species. As a Dorylinae member, they may form colonies with multiple queens, but this requires further study.
• Size & Growth:
  • Queen: Unknown, queen caste has not been described in scientific literature ^[1]
  • Worker: 1.60-2.10mm head length (HL), with workers showing significant size variation within the species ^[1]
  • Colony: Unknown, colony size has not been documented
  • Growth: Unknown, growth rate has not been studied
  • Development: Unknown, development timeline has not been documented (No direct measurements available. Dorylinae species typically develop from egg to worker in 4-8 weeks at tropical temperatures, but this is an estimate for related species only.)
• Antkeeping:
  • Temperature: Based on Madagascar rainforest habitat, aim for 24-28°C. Provide a temperature gradient allowing workers to self-regulate. This is an estimate based on habitat inference.
  • Humidity: Keep substrate moderately humid, rainforest species require damp conditions. Provide a water source and maintain moisture in the nesting area.
  • Diapause: Unknown, tropical species from Madagascar may not require formal diapause, but may show reduced activity during cooler periods
  • Nesting: In captivity, provide a naturalistic setup with multiple chambers. They naturally nest in rotten wood (dead twigs and sticks on the forest floor) ^[1]. A Y-tong or plaster nest with narrow passages works well for their small size.
• Behavior: Simopone sicaria is a highly specialized predator. Workers move rapidly during raids and are capable of locating and breaching the nests of other ant species within minutes ^[1]. They are not aggressive toward humans and do not possess a functional stinger (Dorylinae use chemical defenses instead). Their small size means escape prevention is important, use fine mesh barriers. These ants are strictly predatory and will not accept sugar sources or standard ant feeds.
• Common Issues: Specialized diet, they require live ant brood or small arthropod prey, which can be difficult to source consistently, Limited availability, this species is rarely available in the antkeeping hobby due to its restricted range, Temperature maintenance, being tropical, they require stable warm conditions year-round, Small size makes escape prevention critical despite their predatory nature, No established husbandry guidelines, this species has not been kept in captivity by hobbyists, so all care is experimental

Natural History and Predatory Behavior

Simopone sicaria is a specialized predator belonging to the Dorylinae subfamily, commonly known as army ants. Unlike many ants that forage individually or maintain permanent nests, this species conducts coordinated raids on other ant colonies. The observed raid on Terataner alluaudi demonstrates their efficiency, workers moved rapidly through lower tree branches until they reached the target nest in a twig about 50 yards away, breaching it in under 20 minutes ^[1]. During raids, they emerge carrying the victim's brood while typically discarding captured adult ants by dropping them to the ground ^[1]. This predatory specialization means they cannot survive on sugar sources or dead insects alone, they require access to live ant brood or similar prey.

Housing and Nesting

In their natural habitat, S. sicaria nests in rotten sticks and wood on the rainforest floor ^[1]. For captivity, replicate these conditions using a naturalistic setup with damp substrate and multiple chambers. A Y-tong (acrylic) nest with narrow passages or a plaster nest works well for their small worker size. Provide a water reservoir connected to the nest to maintain humidity without flooding. Include dead leaves, small twigs, or other decor that mimics the forest floor debris where they naturally nest. Outworld space should allow for hunting and prey storage areas.

Feeding Requirements

This species is an obligate predator and requires live ant brood or small live arthropods as their primary food source. They will not accept sugar water, honey, or dead protein sources. In captivity, you would need to provide regular access to brood from feeder ant colonies (such as minor species like Tetramorium or Brachymyrmex) or cultures of small live arthropods like springtails. Feeding frequency depends on colony size, a small colony may need prey every 2-3 days, while larger colonies can consume more. Remove uneaten prey promptly to prevent mold. This specialized diet makes S. sicaria a species for experienced keepers who can reliably source live prey. ^[1]

Temperature and Humidity

As a tropical rainforest species from Madagascar, Simopone sicaria requires warm and humid conditions. Maintain temperatures between 24-28°C with minimal fluctuation. Use a heating cable on one side of the nest to create a gentle gradient, allowing workers to self-regulate their temperature preference. Humidity should be kept moderate to high, the substrate should feel damp but not waterlogged. A water tube or reservoir connected to the nest helps maintain consistent moisture. Avoid both drying conditions and stagnant air, which promotes mold. These conditions mirror the stable, humid environment of the Madagascar rainforest understory where they naturally occur. ^[1]

Behavior and Colony Dynamics

The behavior of S. sicaria centers on their predatory raids. Workers are fast-moving and coordinated, capable of overwhelming ant colonies much larger than their own. They locate prey colonies through chemical trails and work together to breach nest defenses. Unlike some army ants that maintain permanent foraging trails, Simopone appears to conduct discrete raids rather than continuous nomadism. Workers are small (1.60-2.10mm) but aggressive toward prey ant species. They do not sting and pose no danger to keepers. Their colonies likely consist of fewer than several hundred workers based on related species patterns, though this is unconfirmed for this specific species. ^[1]

Frequently Asked Questions

References