Tetramorium infraspinosum

Quick Summary

• Difficulty: Unknown
• Origin & Habitat: Cau Da, Vietnam (Indomalaya region), tropical Southeast Asian habitat ^[1]
• Colony Type: Unknown, only a single worker has ever been documented
• Size & Growth:
  • Queen: Unknown, no queen has ever been documented
  • Worker: Approximately 2mm total length ^[2]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown (No development data exists for this species)
• Antkeeping:
  • Temperature: Unknown, likely tropical preferences based on Vietnam origin, but no specific data
  • Humidity: Unknown, likely prefers humid conditions typical of tropical Vietnam
  • Diapause: Unknown, likely no diapause given tropical origin, but unconfirmed
  • Nesting: Unknown, no nesting observations have been documented
• Behavior: Behavior is completely unstudied, no behavioral observations exist. Based on genus patterns (Tetramorium), they are likely ground-nesting and may form small colonies. As a member of the Myrmicinae tribe Crematogastrini, they likely use a smear defense mechanism, applying venom with a modified spatulate stinger rather than piercing. Escape risk cannot be assessed but their tiny 2mm size suggests standard precautions for small ants should be taken.
• Common Issues: this species is virtually unknown in captivity, no established care protocols exist., only one specimen has ever been documented, making even basic identification uncertain., no information on queen morphology or colony founding., no data on diet, temperature tolerance, or humidity preferences., extremely rare, likely not available through ant dealers.

Species Status and Availability

Tetramorium infraspinosum is one of the most poorly documented ant species in the world. Only a single worker specimen has ever been collected, described by Karavaiev in 1930 from Cau Da, Vietnam ^[1][2]. The holotype appears to be lost, and no additional specimens have been documented since ^[2]. This means the species is essentially unknown to science and has never been kept in captivity. You will not find this species available from any ant dealer or breeder, it exists only in taxonomic literature. If you are interested in keeping Tetramorium species, consider more commonly available species like Tetramorium bicarinatum or Tetramorium caldarium which have established care protocols.

Identification Challenges

The original description provides basic measurements: workers are approximately 2mm total length, with a head that is about 1.16 times longer than broad. The propodeal spines are triangular and acute, somewhat elevated. The body is yellow-rust colored with a paler gaster and appendages. The head and alitrunk are sharply and extensively reticulate-rugose, with longitudinal rugae on the head dorsum ^[2]. Without a queen or colony to compare against, positive identification remains extremely difficult. If you somehow obtain what you believe to be this species, expert verification would be essential.

Defense Mechanism

While no direct observations exist for Tetramorium infraspinosum, it belongs to the Myrmicinae subfamily, tribe Crematogastrini, which typically uses a smear defense mechanism. Instead of piercing with a stinger, the ant uses a modified flattened spatulate stinger to wipe or smear venom onto attackers. This is a general trait of the tribe and may apply to this species.

Related Species and Care Speculation

While no specific care information exists for T. infraspinosum, other Tetramorium species from similar tropical regions may provide rough guidance. The genus Tetramorium typically consists of small ground-nesting ants that nest in soil, under stones, or in rotting wood. They generally prefer humid conditions and do not require hibernation. However, these are broad generalizations and may not apply to this specific species. Any attempt to keep this species would be entirely experimental and would require careful documentation to contribute to our knowledge.

Frequently Asked Questions

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References