Aenictus longicephalus

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Lombok, Indonesia, known only from type locality near Semaya at 'Kopi house' ^[1][2]
• Colony Type: Unknown, only worker caste collected, no queens known ^[1][2]
• Size & Growth:
  • Queen: Unknown, no queens have ever been collected ^[1][2]
  • Worker: 2.00-2.35 mm ^[1]
  • Colony: Unknown, likely large based on typical army ant biology
  • Growth: Unknown
  • Development: Unknown (No development data available for this species)
• Antkeeping:
  • Temperature: Unknown, likely warm tropical conditions based on Lombok location
  • Humidity: Unknown
  • Diapause: Likely none, tropical species
  • Nesting: Unknown, army ants typically do not build permanent nests
• Behavior: Army ant behavior presumed, nomadic and predatory, tiny size creates extreme escape risk
• Common Issues: only 15 worker specimens exist in collections, obtaining them is essentially impossible., army ant biology requires massive colony size and constant movement impossible to provide in captivity., diet likely requires other ants or social insects that are difficult to supply., no queens have been collected making colony founding impossible., extremely small size means escapes are inevitable with standard setups.

Why This Species Cannot Be Kept

You cannot keep Aenictus longicephalus in captivity. Only 15 workers have ever been collected, all from a single location in Lombok in 1998 ^[1]. No queens exist in collections, and the species has never been observed alive in the wild beyond this single collection ^[1]. As army ants in the subfamily Dorylinae, they likely form large colonies with thousands of workers that roam constantly in search of prey ^[2]. This nomadic lifestyle requires enormous space and a continuous supply of appropriate prey, typically other ants or social insects, that cannot be provided in a standard formicarium. Additionally, these ants are likely protected under Indonesian wildlife laws, making collection illegal.

Identification Features

Workers of Aenictus longicephalus are tiny at just 2.00-2.35 mm in total length ^[1]. Their most obvious feature is the elongated head, which is distinctly longer than it is wide ^[1]. The antennae are relatively short, reaching only halfway along the head ^[1]. The head and mesosoma are reddish brown, while the waist segments, gaster, antennae, and legs are yellow to yellowish brown ^[1]. The body is mostly smooth and shiny, with only faint wrinkles on the sides of the mesosoma ^[1].

Distribution

This species is known only from Lombok, an island in Indonesia east of Wallace's Line ^[1][2]. The type specimens were collected near Semaya at a location called 'Kopi house' on October 26,1998 ^[1]. They have never been found anywhere else despite extensive ant surveys in the region ^[1].

Frequently Asked Questions

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References