Temnothorax spinosior

Temnothorax spinosior

Temnothorax spinosior is a tiny ant species native to East Asia, found across Japan, Korea, and northern China. Workers measure around 2mm and are dark brown to black in color, with notably long, sharp propodeal spines that curve slightly downward. This species belongs to the Palearctic clade of acorn ants and prefers dry open habitats like grasslands and bare ground areas, where it nests directly in soil ^[1]. One of the most fascinating aspects of this species is its queen size dimorphism, larger queens typically establish single-queen colonies while smaller queens are found in multi-queen colonies ^[2]. Research has shown these ants navigate primarily by light intensity rather than color, making them unique among studied ant species ^[3][4].

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Native to East Asia, Japan, Korean Peninsula, and northern China. Found in dry open areas such as grasslands and bare places, nesting in soil ^[1][2].
• 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 ^[2].
  • Colony: Optionally polygyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 4-6mm based on genus patterns and queen dimorphism documented in this species ^[2]
  • Worker: Around 2mm ^[2]
  • Colony: Likely up to several hundred workers based on typical Temnothorax colony sizes ^[5]
  • Growth: Moderate
  • Development: 6-10 weeks (Estimated based on typical Temnothorax development patterns. 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 grassland habitat. A gentle gradient allows workers to self-regulate.
  • Humidity: Moderate, prefer drier conditions compared to many ants. Keep nest substrate lightly moist but allow it to partially dry between waterings. Avoid overly damp conditions.
  • Diapause: Yes, likely requires winter dormancy period of 2-3 months at reduced temperatures (around 10-15°C), consistent with their temperate Asian distribution.
  • Nesting: Naturalistic setups with soil or plaster work well. They nest in soil in the wild, so a dirt setup or Y-tong with appropriate moisture retention is suitable. Small chambers scaled to their tiny size.
• Behavior: Generally calm and non-aggressive. Workers forage on the ground and are rarely found on vegetation. They do not establish permanent trails, each foraging journey uses new paths ^[3]. They navigate primarily using light direction and intensity rather than scent trails or color vision. Small size means escape prevention is important despite their docile nature.
• 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 phase can lead to overfeeding or disturbance by impatient keepers, 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 is a small ant that does well in naturalistic setups with soil or in Y-tong 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 in the setup are very small, these ants can escape through surprisingly tight spaces. A test tube setup can work for founding colonies, but transfer to a more spacious formicarium once the colony reaches 20-30 workers. They do not need tall nests, these are ground-dwelling ants that prefer horizontal chambers.

Feeding and Diet

Like most Temnothorax species, these ants are omnivorous and will accept a variety of foods. Offer sugar sources such as honey water or sugar water regularly, along with protein sources like small insects (fruit flies, small mealworms, 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. They do not establish permanent food trails, so each feeding is a new foraging opportunity ^[3].

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 to around 10-15°C to simulate natural seasonal cycles. This dormancy period is important for colony health and may trigger reproductive behavior in spring. Do not cool suddenly, gradually reduce temperatures over 1-2 weeks. Avoid temperatures below 5°C or above 30°C. ^[1][2]

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 ^[3][4]. They do not establish permanent foraging paths like some ant species. When returning home, they rely heavily on the brightest light source in their environment. This makes them fascinating to observe but also means they can become confused if lighting conditions change dramatically 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 ^[2]. 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. With multiple foundresses (pleometrosis), the colony may become polygynous, though some queens may be eliminated over time. The claustral founding queen will seal herself in a chamber and raise the first workers (nanitics) on her own body reserves.

Frequently Asked Questions

References