Pheidole micridris

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Tropical terra firme forest in Peru and Ecuador, with type locality 15 km northeast of Puerto Maldonado in Madre de Dios, Peru ^[1][2].
• Colony Type: Unconfirmed. Only the major worker has been described, the minor caste and colony structure are unknown.
• Size & Growth:
  • Queen: Size data unavailable ^[1]
  • Worker: Size data unavailable ^[1]
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown (No development data exists for this species.)
• Antkeeping:
  • Temperature: Unconfirmed. Based on tropical origin, aim for warm conditions around 24-28°C. Monitor colony activity ^[1].
  • Humidity: Unconfirmed. Terra firme forest habitat suggests high humidity. Keep nest substrate consistently moist but not waterlogged ^[1].
  • Diapause: Unknown. As a tropical species, it likely does not require hibernation.
  • Nesting: Natural nesting occurs in red rotten logs on the forest floor. In captivity, use a small setup with moist substrate and rotting wood. Escape prevention is critical due to tiny size ^[1].
• Behavior: Behavior is completely unstudied. No information on diet, aggression, or foraging is available. Escape risk is extremely high due to minute size.
• Common Issues: no captive keeping data exists, this species may not survive in captivity at all, tiny size makes escape prevention extremely difficult, unknown diet requirements, may refuse standard ant foods, humidity and temperature needs are speculative, only major caste known, colony founding and minor workers are a complete mystery

Species Discovery and Status

Pheidole micridris was described by E.O. Wilson in 2003 from a single major worker collected in Peru. This species is known only from the type specimen, and almost nothing has been documented about its biology since its description. The type specimen was collected from a red rotten log on the floor of terra firme forest in Madre de Dios, Peru ^[1].

Identification and Morphology

The major worker of Pheidole micridris is distinctive due to its extremely small size. Key features include a circular head shape when viewed from the front, eyes positioned far forward on the head, a raised promesonotum that drops steeply to the metanotum, and a cone-shaped postpetiole. The head and mesosoma are covered in fine foveae, and the color is dark yellow with a slightly darker brownish-yellow gaster. The minor worker has not been described and would likely be even smaller ^[1].

Habitat and Distribution

This species is known only from the Amazon basin in Peru and Ecuador. The type locality is in Madre de Dios, Peru, where it was collected from a red rotten log on the forest floor of terra firme rainforest ^[1][2].

Captive Care Considerations

Keeping Pheidole micridris in captivity would be extremely challenging due to the lack of biological data. No one has successfully maintained this species, so any attempt would involve original research. Use a small naturalistic setup with moist forest floor substrate, maintain warm temperatures, and offer varied foods to test acceptance. Escape prevention must be excellent due to their tiny size ^[1].

Frequently Asked Questions

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References