Temnothorax tuscaloosae

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southeastern United States, recorded from Alabama, Mississippi, North Carolina, Tennessee, South Carolina, Georgia, and Virginia. Inhabits mesic hardwood forests, especially at the bases of large trees in leaf litter. Nests in acorns, hickory nuts, small sticks, and soil cavities ^[2][5][4][1].
• Colony Type: Extremely polygynous, colonies average 10.4 ± 7.7 queens (range 1-38), with 77.3% polygynous (5+ queens),21.3% oligogynous (2-4 queens), and only 1.3% monogynous. All queens are mated and actively laying eggs, workers can also lay unfertilized eggs ^[2][3]. Colonies show unicolonial tendencies, fusing readily with unrelated conspecifics ^[2].
• Size & Growth:
  • Queen: ~2.7 mm ^[1].
  • Worker: ~1.9 mm ^[1].
  • Colony: Average 54.5 workers per colony, up to around 100 ^[2].
  • Growth: Moderate, typical for Temnothorax.
  • Development: Estimated 6-10 weeks, based on related Temnothorax species. (No direct developmental data exists, the estimate comes from other members of the genus. Multiple egg‑laying queens may speed up production once the colony is established.)
• Antkeeping:
  • Temperature: Room temperature (20-24°C) during the active season. As a subtropical species, they tolerate warmth but should avoid extreme heat (above 30°C). Northern populations (Virginia) experience winter freezing, so a cool rest period is needed ^[2].
  • Humidity: Moderate to moist. The natural habitat is leaf litter on the forest floor, so keep the nest substrate lightly moist but not waterlogged, and provide a drier area. Misting the outworld occasionally helps.
  • Diapause: Yes, Virginia populations face episodic winter freezing ^[2]. Provide a winter rest period of 2-3 months at 5-10°C (e.g., in a refrigerator). Skipping diapause may stress the colony.
  • Nesting: Use small, tight chambers scaled to their tiny 1.9 mm workers. Y‑tong (AAC) nests with narrow passages, small test tubes, or naturalistic setups with actual acorns or hickory nuts work well. They also nest in soil cavities and under rocks ^[2][4][1].
• Behavior: Workers are small, dark, and forage on the ground. Colonies are non‑aggressive and show high social tolerance, nest fusion experiments revealed no aggression between individuals from different colonies, even from distances up to 200 m ^[2]. Workers can lay unfertilized eggs ^[2]. Their defense mechanism is smearing venom (common to the tribe Crematogastrini) rather than stinging, though to humans it is imperceptible. Excellent escape prevention is critical because of their minute size, they can squeeze through gaps of less than 1 mm.
• Common Issues: escape prevention is critical, workers are only 1.9 mm and can slip through standard barriers., multiple egg‑laying queens are normal, don't try to reduce queen numbers., small colony size (under 100 workers) is typical and not a sign of poor health., winter hibernation is required, colonies kept warm year‑round may decline., wild‑caught colonies may suffer from competition with invasive fire ants (Solenopsis invicta) in parts of the native range ^[2].

Understanding the Extreme Polygyny

Temnothorax tuscaloosae holds the record for the highest queen numbers known in the genus Temnothorax. Studies found colonies averaging 10.4 queens, with some nests containing up to 38 egg‑laying queens ^[2]. This is remarkable because most Temnothorax species have only 1-2 queens per colony. The species is functionally polygynous, meaning all queens in a colony are mated and actively laying eggs. Dissections of 240 queens from 19 colonies showed that 235 had developed eggs and corpora lutea, even in nests with over 20 queens ^[2]. Workers can also produce unfertilized eggs, 4 of 12 dissected workers had ovarioles, and one contained a mature egg ^[2]. For antkeepers, this means your colony will naturally have multiple queens, that is normal and not a problem to fix.

Colony Fusion Behavior

This species shows unicolonial tendencies, colonies are extremely tolerant of each other. In experiments, researchers placed workers from different colonies together, and 92.9% fused within 5 days regardless of distance (tested up to 200 meters) ^[2]. No aggressive behavior was observed between individuals from different colonies. This suggests the species may not maintain strict colony boundaries like most ants do. For keepers, this means introducing workers from different Temnothorax tuscaloosae colonies will likely result in peaceful integration rather than fighting. However, if you want to maintain separate colonies, keep them well separated, they may fuse on their own.

Nesting and Housing

In the wild, Temnothorax tuscaloosae nests in tiny cavities, primarily acorns and hickory nuts in leaf litter, but also small sticks, soil cavities, and under rocks ^[2][4][1]. They prefer mesic (moderately moist) hardwood forests, often at the base of large trees ^[5]. Nest density can reach up to 12 nests per square meter in favorable spots ^[2]. For captive care, use small, tight chambers scaled to their tiny 1.9 mm workers. Y‑tong (AAC) nests with narrow passages, small test tubes, or a naturalistic setup with actual acorns or hickory nuts work well. Keep the nesting area humid but not wet, forest‑floor ants need moisture but not saturation. The outworld can be simple since workers are small foragers that travel modest distances.

Temperature and Seasonal Care

As a subtropical species from the southeastern United States, Temnothorax tuscaloosae prefers warm conditions but has adapted to temperate climates in its northern range (Virginia). The Virginia population experiences winter conditions with yearly episodic freezing temperatures, so this species does require a winter dormancy period ^[2]. During the active season, keep colonies at room temperature (roughly 20-24°C). In fall, reduce temperatures to around 5-10°C for 2-3 months to simulate winter. This hibernation period is important for colony health and may trigger reproductive behavior in spring. Do not keep them warm year‑round, as that can stress the colony.

Feeding and Diet

Specific dietary studies for Temnothorax tuscaloosae are lacking, but based on related Temnothorax species, they likely feed on small insects, honeydew, and nectar from the forest floor. In captivity, offer small protein sources such as fruit flies, pinhead crickets, or small mealworms. Provide sugar water or honey as a carbohydrate source. Feed small amounts 2-3 times per week and remove uneaten prey to prevent mold. Because of their tiny size, all food items should be very small.

Growth and Development

Colonies are relatively small compared to many common ant species, averaging about 55 workers ^[2]. This is normal for the species, they are not slow‑growing, they simply stay small. Larger colonies tend to have more queens (statistically correlated), suggesting queen number drives colony growth potential ^[2]. Development from egg to worker likely takes 6-10 weeks based on typical Temnothorax patterns, though this has not been specifically studied for this species. The presence of multiple egg‑laying queens means colonies can produce workers steadily once established.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References