Crematogaster wilwerthi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Central Africa, documented in the Democratic Republic of Congo ^[1]. They live in forested habitats where they nest in dead wood, hollow branches, and under bark in trees.
• Colony Type: Colony structure is unconfirmed for this specific species. Based on typical Crematogaster patterns, likely single-queen colonies.
• Size & Growth:
  • Queen: ~8-10mm, inferred from Crematogaster genus
  • Worker: ~3-5mm, inferred from Crematogaster genus
  • Colony: Estimated up to 3000 workers based on related species
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at tropical temperatures based on genus data (Development time is typical for tropical Crematogaster species, faster in warm conditions, slower if cool)
• Antkeeping:
  • Temperature: Keep at 24-28°C (warm tropical conditions). A slight gradient allows workers to regulate their temperature.
  • Humidity: Moderate humidity around 60-75%. These arboreal ants prefer slightly drier conditions than ground-nesting species, ensure good ventilation to prevent mold.
  • Diapause: No true diapause, being tropical, they do not require hibernation. However, slight temperature reductions in winter months may be beneficial.
  • Nesting: Arboreal species prefer nests that mimic their natural hollow twig habitat. Y-tong (AAC) nests, acrylic nests with narrow chambers, or naturalistic setups with cork bark work well. They do best with tight, enclosed chambers rather than open spaces.
• Behavior: Generally peaceful but will defend their nest vigorously. They are active foragers and excellent climbers. Workers communicate through chemical signals and can emit a foul-smelling defensive secretion when threatened. As Myrmicinae, they use a smear defense mechanism, wiping venom onto enemies rather than stinging. Escape risk is moderate, they are good climbers but can be contained with standard barriers.
• Common Issues: colonies may fail if kept too cool, maintain warm temperatures consistently, arboreal nesting means they need tight chambers, too much open space causes stress, defensive secretions can stain surfaces and have a noticeable odor, wild-caught colonies may have parasites that need treatment, queens can be difficult to locate as they nest in hard-to-reach tree locations

Nest Preferences and Housing

Crematogaster wilwerthi is an arboreal species that naturally nests in hollow twigs, dead branches, and under bark in trees. In captivity, they do best in nests that mimic these conditions. Y-tong (AAC) nests work well because they provide the dark, enclosed chambers these ants prefer. Acrylic nests with narrow tunnels are also suitable. Avoid large, open formicarium spaces, these ants feel safer in tight, snug chambers. If using a naturalistic setup, provide cork bark or wooden structures that mimic their natural tree-nesting habitat. Ensure the nest has multiple chambers connected by small tunnels.

Temperature and Heating

Being a tropical African species, Crematogaster wilwerthi requires warm conditions to thrive. Keep the nest area at 24-28°C. Temperatures below 22°C can slow colony development significantly, and prolonged cold exposure can kill colonies. Use a heating cable or mat on one side of the nest to create a gentle temperature gradient, allowing workers to move between warmer and cooler areas. Place the heating element on top of the nest rather than underneath to avoid excessive drying. Room temperature may be sufficient if your home is consistently warm, but monitor with a thermometer.

Feeding and Diet

In the wild, Crematogaster species feed primarily on honeydew from aphids and scale insects, along with small insects and nectar. In captivity, offer a varied diet: sugar water or honey water should be available constantly. For protein, offer small insects like fruit flies, small crickets, and mealworms. They generally accept most small prey items. Feed protein sources 2-3 times per week, and replace sugar water every few days. Remove uneaten prey after 24 hours to prevent mold. These ants are not heavy feeders compared to some species, offer modest portions.

Behavior and Temperament

Crematogaster wilwerthi gets its nickname 'acrobat ant' from their distinctive defensive behavior, when threatened, workers raise their abdomen over their head, resembling an acrobat balancing. They can also emit a foul-smelling defensive secretion from their abdomen. This species is generally not aggressive toward humans but will vigorously defend their nest if disturbed. They are excellent climbers and can scale smooth surfaces, so use fluon or other barriers if needed. Workers are most active during evening and nighttime hours. They communicate using chemical trails to guide nestmates to food sources.

Colony Establishment

When establishing a colony from a wild-caught queen, you will likely need to locate a dealate (wingless) queen who has already founded her nest in a hollow twig or similar location. The founding queen will seal herself in a chamber and raise the first brood alone on her stored fat reserves. This claustral founding typically takes 4-8 weeks before the first workers (nanitics) emerge. Do not disturb the queen during this period. Once workers emerge, they will gradually expand the nest and begin foraging. Wild-caught colonies may carry parasites, quarantine and observe new colonies before introducing them to established setups.

Frequently Asked Questions

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References