Tetramorium aspina

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Subalpine spruce forest in Giresun-Dereli-Çamlı Village, Turkey (40.4767°N,38.5108°E), at 1953 m elevation. The type nest was under a flat stone on a steep (50-55°), east‑facing rocky slope ^[1].
• Colony Type: Likely single‑queen colonies (monogyne), only one queen was found. This species is a social parasite of Tetramorium caucasicum ^[1].
• Size & Growth:
  • Queen: ~4-5 mm, inferred from Tetramorium genus patterns, size data unavailable ^[1]
  • Worker: ~2-3 mm, inferred from Tetramorium genus patterns, size data unavailable ^[1]
  • Colony: Unknown, only one wild colony documented ^[1]
  • Growth: Unknown
  • Development: Unknown, no captive data exists. Related Tetramorium species take about 6-10 weeks at 22-25 °C. (Development timeline has not been studied.)
• Antkeeping:
  • Temperature: Unconfirmed, the subalpine habitat suggests cooler conditions. Based on high‑elevation Tetramorium species, aim for roughly 18-22 °C and observe the colony ^[1].
  • Humidity: Unconfirmed, keep nest substrate moderately moist but not waterlogged, as is typical for Tetramorium species.
  • Diapause: Unknown, likely requires winter rest given the subalpine origin, but no specific data exists ^[1].
  • Nesting: In the wild the queen was found 30-35 cm deep under a stone. A deep naturalistic setup (e.g., soil or plaster nest with deep chambers) would be needed to mimic subterranean conditions ^[1].
• Behavior: Workers are subterranean foragers, their yellow color and tiny eyes point to life underground. As a social parasite, they depend on host workers and are non‑aggressive toward their host. Escape risk is low because of their size and underground habits, but fine mesh is still recommended ^[1].
• Common Issues: This species has never been kept in captivity, no care protocols exist., As a social parasite, keeping T. aspina also requires a healthy colony of its host species Tetramorium caucasicum., The host species itself has limited availability and care documentation., Extremely small worker size (under 3 mm) makes feeding challenging, would need micro‑prey like springtails., Only one wild colony has ever been documented, so captive stock does not exist.

Species Identification and Key Traits

Tetramorium aspina can be identified by its yellowish color and strongly reduced or absent propodeal spines. Workers are smaller than those of related species in the Tetramorium caespitum complex. Their tiny eyes (about 23 facets per side) and pale body are adaptations to subterranean life ^[1].

The name 'aspina' means 'without spines', referring to the missing propodeal spines, a unique trait among European and Mediterranean Tetramorium. This reduction is typical of social parasites, which rely on host workers for defense and foraging ^[1].

Natural History and Distribution

This species is known from a single collection in northeastern Turkey, making it one of the rarest ants in Europe. The type locality is a subalpine, sparse spruce forest at 1953 m elevation with large sun‑exposed rocky patches. The nest was found under a flat stone on a steep (50-55°), east‑facing slope ^[1].

The colony was discovered living with what was originally thought to be Tetramorium immigrans but is now confirmed as Tetramorium caucasicum by morphometric analysis ^[1]. Both species were present in roughly equal numbers throughout the nest chambers. A single T. aspina queen was lodged in a chamber 30-35 cm underground ^[1].

Social Parasitism

Tetramorium aspina is a permanent social parasite, it lives entirely inside the host nest and depends on host workers to raise its brood. This is different from temporary parasitism, where the queen kills the host queen and uses host workers only for a short time ^[2].

The type colony contained a queen, workers, and brood of T. aspina alongside the host. The presence of T. aspina pupae in the brood chambers suggests host workers actively cared for the parasite's young. This relationship is called inquilinism, the parasite uses host resources without offering anything in return ^[1][2].

Keeping a Parasitic Species

Keeping Tetramorium aspina in captivity would be extremely challenging and is not recommended for most antkeepers. Unlike typical ants that can be set up in a formicarium and fed basic diets, this species requires a living host colony (Tetramorium caucasicum) that must thrive alongside the parasite, both must do well together ^[1].

No documented protocol exists for keeping T. aspina, and the species has never been captive‑bred. Social parasites like this have evolved to depend entirely on host workers for brood care, foraging, and nest maintenance. Separating them from the host usually leads to colony death. Additionally, the host species itself has limited availability and care information in the hobby ^[1].

For these reasons, T. aspina is best appreciated through scientific literature. If you're interested in parasitic ants, consider starting with more established species such as Myrmica rubra (which can be kept without a host) or researching well‑documented slave‑making Formica species.

Frequently Asked Questions

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References