Forelius brasiliensis

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to the Neotropical region – Argentina, Bolivia, Brazil, Paraguay, Uruguay. Recorded in seasonally dry tropical forests (Caatinga biome), Cerrado savanna, Pantanal wetlands, and disturbed settings like vineyards and mining areas ^{[4][5][6][3][7]}.
• Colony Type: Not documented in scientific literature – colony structure is unknown.
• Size & Growth:
  • Queen: Size data unavailable.
  • Worker: Size data unavailable (described as tiny, but no measurements published).
  • Colony: Unknown.
  • Growth: Unknown.
  • Development: Unknown. (No published data on development times.)
• Antkeeping:
  • Temperature: Inferred from thermophilic behavior: keep warm, around 24–30°C. Provide a temperature gradient with a warmer side (~28°C). The species forages in direct sunlight ^[2], so cooler conditions may reduce activity.
  • Humidity: Moderate humidity. Allow substrate to partially dry between waterings – the species tolerates drier conditions typical of its native open habitats.
  • Diapause: Unknown. The species occurs in subtropical areas, but no specific diapause data exists. Likely does not require prolonged cold, maintain room temperature year-round and reduce feeding if activity drops.
  • Nesting: Natural nesting sites are not described. In captivity, standard test tubes work for founding. Established colonies can be housed in Y-tong, plaster, or soil nests with moderate moisture and good drainage.
• Behavior: Highly active and thermophilic – forages during the hottest parts of the day, often with the abdomen raised ^[2]. Workers are fast-moving and alert. They are not aggressive but will defend the nest. Their tiny size (exact measurements unavailable) makes them escape artists, fine mesh and tight seals are essential. Omnivorous with a documented protein preference ^[2].
• Common Issues: escape prevention is critical – their tiny size allows them to squeeze through standard gaps., colonies may decline if kept too cool – maintain warm temperatures consistently., protein preference means regular insect feeding is needed, not just sugar sources., fast movement makes them difficult to contain during transfers – work in a closed area.

Temperature and Heating

This species is strongly thermophilic. In the wild, it actively forages under direct sunlight and its abundance is positively correlated with temperature ^[2]. Keep the nest at 24–30°C, with a localized warm area reaching up to 30°C. Use a heating cable or mat on one side of the nest, but avoid overheating or drying out the nest. If workers cluster near the heat source, they need warmth. Sluggish behavior may indicate the temperature is too low. Room temperature (20–22°C) can be tolerated temporarily, but long-term cooling will reduce activity and may harm the colony.

Feeding and Diet

Forelius brasiliensis is omnivorous with a noted preference for protein ^[2][3]. Offer small insects (fruit flies, pinhead crickets, small mealworms) two to three times per week. They also accept sugar water, honey, or diluted syrup as an energy source. Remove uneaten prey after 24–48 hours to prevent mold. Their tiny size means prey should be appropriately small or pre-killed. Providing variety in food sources supports colony health.

Housing and Nest Setup

Founding colonies do well in standard test tube setups with a water reservoir and dark covering. Once the colony grows beyond 20–30 workers, you can move them to a Y-tong, plaster, or soil nest. Keep chambers appropriately sized – too large can stress a small colony. Because their size is unknown but undoubtedly tiny (inferred from the genus Forelius), use fine metal or plastic mesh on all ventilation points. Seal all connections between nest and outworld with cotton or aquarium sealant. Check regularly for gaps.

Behavior and Temperament

Workers are fast-moving and highly active, especially in warm conditions ^[2]. When disturbed, they raise their abdomen – a characteristic defensive posture of many dolichoderines. They are not known to be aggressive toward keepers but will defend the nest if provoked. Foraging occurs primarily during daylight, and they quickly recruit nestmates to food sources. Their small size and speed make them challenging to transfer: work in a contained area and have escape barriers ready.

Seasonal and Diapause Considerations

There is no published data on diapause for this species. Since it originates from subtropical South America, it likely does not require prolonged cold hibernation. In winter, you can reduce feeding frequency and allow the temperature to drop to room level (20–22°C) without harm. Do not refrigerate. If the colony slows down, continue offering water and small amounts of food. Maintain some warmth year-round to prevent stress.

Frequently Asked Questions

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References