Temnothorax spinosior

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to East Asia – Japan, Korean Peninsula, and northern China. Found in dry open areas like grasslands and bare places, nesting in soil ^[1][3].
• Colony Type: Facultatively polygynous – colonies can have either a single queen (monogyne) or multiple queens (polygyne). Queen size correlates with colony structure: larger queens are typically found in single-queen colonies while smaller queens are found in multi-queen colonies ^[3].
• Size & Growth:
  • Queen: Estimated ~5-6mm based on genus patterns and documented queen size dimorphism ^[3]
  • Worker: Around 2mm ^[3]
  • Colony: Up to several hundred workers (typical for Temnothorax)
  • Growth: Moderate
  • Development: 6-10 weeks (estimated, based on typical Temnothorax development) (Temperature-dependent – warmer conditions within acceptable range may speed development.)
• Antkeeping:
  • Temperature: Keep at 22-26°C – they prefer warm, stable conditions typical of their dry grassland habitat. Provide a gentle gradient for self-regulation ^[1].
  • Humidity: Moderate to low – they prefer drier conditions. Keep nest substrate lightly moist but allow it to partially dry between waterings. Avoid waterlogging ^[1].
  • Diapause: Yes – likely requires winter dormancy of 2-3 months at reduced temperatures (around 10-15°C), consistent with their temperate East Asian distribution ^[1][3].
  • Nesting: Naturalistic setups with soil or plaster work well since they nest in soil in the wild. Y-tong (AAC) nests with small chambers also work. Avoid large open spaces – they prefer snug chambers scaled to their tiny size ^[1].
• Behavior: Generally calm and non-aggressive. Workers forage on the ground and rarely climb vegetation. They do not establish permanent foraging trails – each journey uses new paths ^[4]. They navigate using light direction and intensity rather than color or scent trails. Escape prevention is critical due to their 2mm size.
• Common Issues: escape prevention is critical due to their tiny 2mm size – they can squeeze through standard gaps easily, colonies may fail if kept too damp – they prefer drier conditions than many Myrmicinae, slow initial growth during founding can lead to overfeeding or disturbance – be patient, winter dormancy is likely required – colonies kept active year-round may decline, wild-caught colonies may carry parasites that can devastate captive colonies

Housing and Nest Setup

Temnothorax spinosior does well in naturalistic setups with soil or in Y-tong (AAC) nests. In the wild, they nest directly in soil in dry, open areas, so a dirt formicarium or a plaster nest with moderate moisture works well ^[1]. Because workers are only about 2mm, ensure any gaps are very small – these ants can escape through surprisingly tight spaces. A test tube setup works for founding, but transfer to a more spacious formicarium once the colony grows to several workers. They do not need tall nests – they are ground-dwelling and prefer horizontal chambers.

Feeding and Diet

Like most Temnothorax, these ants are omnivorous. Offer sugar sources like honey water or sugar water regularly, along with small protein sources such as fruit flies, small mealworms, or tiny crickets. They forage on the ground in the wild, so place food on the foraging area rather than deep in the nest. Feed small amounts that can be consumed within a day or two to avoid mold.

Temperature and Seasonal Care

Maintain temperatures between 22-26°C for optimal colony development. They come from temperate regions of East Asia and will benefit from a winter rest period. During winter (roughly November through February), reduce temperatures gradually to around 10-15°C over 1-2 weeks to simulate natural seasonal cycles. This dormancy period is important for colony health and may trigger reproductive behavior in spring. Avoid temperatures below 5°C or above 30°C ^[1][3].

Behavior and Observation

This species is known for its unique navigation behavior – research shows they navigate primarily by light intensity and direction rather than by color or scent trails ^[4][5]. They do not establish permanent foraging paths. When returning home, they rely heavily on the brightest light source. This makes them fascinating to observe but means they can become confused if lighting conditions change abruptly during foraging. Workers are docile and rarely aggressive toward keepers. They are ground-dwelling and seldom climb on vegetation in the wild.

Colony Structure and Queen Care

Temnothorax spinosior exhibits queen size dimorphism – larger queens are typically found in single-queen colonies while smaller queens are found in multi-queen colonies ^[3]. This means your colony may have one queen or several depending on the founding queen's size. If you have a large queen, expect a single-queen colony. If you have multiple queens, they may coexist, though careful observation is recommended as the founding process is not well documented for this species.

Frequently Asked Questions

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References