Tetramorium albenae

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Greece (Thessaly, Magnesia), found at 57 m elevation in a lowland olive grove near the Miotiko river, under a flat stone in a rocky olive grove with herb-rich grassland ^[1][2].
• Colony Type: Inquiline (workerless social parasite), requires a colony of Tetramorium kephalosi to survive. The parasite queen lives permanently attached to the host queen and lays eggs that host workers raise ^[1].
• Size & Growth:
  • Queen: Size data unavailable, no total length reported in the description ^[1].
  • Worker: Workerless (no workers produced by this species) ^[1].
  • Colony: Unknown, only known from the type specimen and a short captive observation ^[1].
  • Growth: Unknown
  • Development: Unknown, offspring in captivity were deformed and did not survive ^[1]. (Captive attempts resulted in deformed offspring that died shortly after hatching, the species likely has very specific requirements not yet understood.)
• Antkeeping:
  • Temperature: Unknown, no specific data available. Likely similar to the host species (Tetramorium kephalosi) preferences, around 20-25 °C based on the Mediterranean habitat.
  • Humidity: Unknown, natural habitat was a lowland olive grove with herb-rich undergrowth. Standard nest humidity is probably suitable, but no confirmed data.
  • Diapause: Unknown, no data on overwintering requirements. As a Mediterranean species, it likely experiences cooler winter periods, but whether a true diapause is needed is unstudied ^[1].
  • Nesting: Must be kept with a host colony of Tetramorium kephalosi. The natural nest was under a flat stone (~30 cm diameter) in an olive grove ^[1].
• Behavior: Extremely docile, this is a permanent social parasite that cannot survive without its host. The queen spends her entire life attached to the host queen, laying eggs that host workers tend ^[1]. No aggressive behavior toward the host has been observed ^[1]. The inquiline queen almost constantly taps the host queen with her antennae, likely to receive food or manipulate host behavior ^[1]. Since this species produces no workers, there is no foraging escape risk, but the tiny queen could potentially escape if not properly contained. As a member of Myrmicinae and tribe Crematogastrini, it possesses a modified flattened stinger used for smearing venom, though it never needs to defend itself.
• Common Issues: this species cannot be kept without a host colony, it is a permanent social parasite that cannot feed itself or survive independently ^[1]., even with a host colony, captive attempts have resulted in deformed offspring that died shortly after hatching ^[1]., the host species (Tetramorium kephalosi) may be difficult to obtain and maintain in captivity., extremely rare in the wild, only known from a single collection in Greece ^[1]., no established captive breeding protocols exist for this or any Tetramorium inquilinum group species ^[1].

Understanding Inquiline Ants

Tetramorium albenae is an inquiline social parasite, a rare type of ant that cannot found its own colony. Instead, the queen invades the nest of another ant species (Tetramorium kephalosi) and lives permanently inside, relying entirely on host workers to survive and raise her brood ^[1]. This species is workerless: it produces no workers of its own. The queen lays eggs, and host workers care for them as if they were their own ^[1]. This is fundamentally different from slave-making ants, which raid other colonies to capture workers. Inquilines integrate peacefully into the host colony and are tolerated by the host ^[1]. The Tetramorium inquilinum species group contains only five known species, all of which are workerless parasites ^[1].

Host Species Requirements

Keeping Tetramorium albenae first requires obtaining and maintaining a healthy colony of its host, Tetramorium kephalosi (a member of the Tetramorium semilaeve species-group) ^[1][2]. The host colony was found under a flat stone in an old, rocky olive grove, suggesting it prefers dry, stony habitats with cover ^[1]. In captivity, you would need to provide appropriate nesting sites, flat stones or similar structures, that the host species accepts. The host colony must be well-established before introducing the inquiline, and even then, success is uncertain. The 2023 research showed that even in optimal laboratory conditions, the inquiline's offspring failed to develop properly and died shortly after hatching ^[1]. This indicates the species has very specific requirements we do not yet understand.

Captive Observations

The only observation of this species came from the type specimen collected in April 2022 in Greece. When researchers turned the stone covering the nest, they found the host queen with the inquiline queen attached to her gaster, literally riding on top of the host queen ^[1]. In captivity, the inquiline queen laid eggs almost constantly, and host workers collected and tended them ^[1]. She almost continuously tapped on the host queen's thorax and legs with her antennae, likely to communicate or receive food ^[1]. No aggressive behavior from host workers toward the inquiline was ever observed, they accepted her as part of the colony ^[1]. However, the majority of inquiline pupae died soon after they started moving, and those that emerged were deformed (with rudimentary wings, shortened and deformed legs and antennae) and died shortly after hatching ^[1]. This suggests the species requires specific conditions that we cannot yet provide.

Why This Species Is Not Recommended for Keepers

Tetramorium albenae is not suitable for antkeeping for several reasons. First, it requires a host colony to survive, without Tetramorium kephalosi, the inquiline will die ^[1]. Second, even when kept with the host, captive attempts have failed: offspring were deformed and could not survive ^[1]. Third, the species is extremely rare, known only from a single wild collection in Greece ^[1]. Fourth, no established breeding protocols exist for this or any related species in the Tetramorium inquilinum group. For keepers interested in parasitic species, consider studying species that are better established in captivity, or focus on observing these fascinating behaviors in the wild. If you are specifically interested in inquiline ants, supporting research efforts is a better option than attempting to keep them.

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