Myrmicaria exigua

Quick Summary

• Difficulty: Unknown, likely Easy to Medium
• Origin & Habitat: West and Central Africa (Sierra Leone, Central African Republic, Gabon, DRC). Found in forested habitats at elevations from 110-640m, typically in leaf litter and ground-level foraging zones ^[2][3].
• Colony Type: Unconfirmed colony structure. Based on genus placement in Solenopsidini, likely forms moderate-sized colonies. No specific data on queen number (monogyne vs polygyne) is available for this species.
• Size & Growth:
  • Queen: likely 5-7mm, inferred from genus patterns
  • Worker: 3-4.5mm ^[1]
  • Colony: Unknown, likely several hundred workers based on typical Solenopsidini colony sizes
  • Growth: Unknown, likely moderate growth rate typical of small Myrmicinae
  • Development: Estimated 6-8 weeks based on related Solenopsidini species at warm temperatures (24-28°C) (No species-specific development data exists. Estimates based on genus-level patterns for small tropical ants.)
• Antkeeping:
  • Temperature: Keep at 24-28°C (warm room temperature to slightly elevated). No species-specific data exists, but forest-dwelling Afrotropical ants typically thrive in these conditions.
  • Humidity: Moderate to high humidity (60-80%). These ants inhabit forest floors in their native range, so keep the nest substrate consistently moist but not waterlogged.
  • Diapause: Unknown for this species. Most Afrotropical ants do not require true hibernation, but may slow down during cooler periods.
  • Nesting: Natural nesting occurs in soil and leaf litter in forested areas. In captivity, a test tube setup or small Ytong/plaster nest works well. Keep the nest humid with access to a water tube.
• Behavior: Active foragers that likely search for small prey and honeydew. No specific data on aggression or sting potency exists, but given their tiny size, they pose minimal threat to keepers. Their small size (under 5mm) means escape prevention should be a priority, use fine mesh and tight-fitting barriers.
• Common Issues: very small size makes escape likely without proper barriers, no published care guidelines means keepers must adapt from related species, humidity control is critical, too dry causes colony decline, limited availability in the antkeeping hobby

Natural History and Distribution

Myrmicaria exigua is a poorly documented ant species native to West and Central Africa. The species was originally described from Sierra Leone by André in 1890,and subsequent records exist from the Central African Republic, Gabon, and the Democratic Republic of Congo (particularly the Kisangani area) ^[3]. Specimens have been collected from elevations ranging from 110m to 640m in forested regions, typically through leaf litter sifting and Malaise trapping ^[2]. Several subspecies have been described, including M. exigua gracilis, M. exigua kisangani, M. exigua obscura, M. exigua pulla, M. exigua rufiventris, and M. exigua simplex, suggesting some regional variation in this species ^[4].

Identification and Morphology

Myrmicaria exigua is a very small ant species, with total length measuring only 3-4.5mm ^[1]. This places it among the smaller Myrmicaria species. A key identifying feature is the antenna: unlike most other African Myrmicaria which have a three-segmented antenna club, M. exigua has only the last funicular segment elongated, giving it a more gradual antenna shape ^[1]. Workers are likely reddish-brown to dark brown in color, though exact coloration is not well-documented in available literature. The genus Myrmicaria is characterized by a distinct postpetiole (the second segment of the petiole) and typically a smooth, glossy body surface.

Housing and Nesting

In captivity, Myrmicaria exigua can be housed in standard test tube setups for founding colonies, then transitioned to small plaster or Ytong nests as the colony grows. Given their tiny size (under 5mm), ensure that any connections between the outworld and nest are narrow enough to prevent escapes. These forest-dwelling ants prefer humid conditions, keep the nest substrate moist and provide a constant water source. A small outworld with a sugar feeder and protein food dish works well. Because they are active foragers, they will benefit from regular feeding schedules and may display hunting behaviors toward small prey.

Feeding and Diet

While no species-specific feeding data exists, Myrmicaria and other Solenopsidini ants are typically omnivorous, accepting sugar sources (honey water, sugar water) and protein (small insects, mealworms, fruit flies). In their native forest habitat, they likely forage for small arthropods and tend aphids for honeydew. Offer a mix of sugar water and small protein items. Given their tiny size, prey items should be appropriately sized, fruit flies, pinhead crickets, or small mealworm pieces work well.

Temperature and Seasonal Care

As an Afrotropical species from forest habitats, Myrmicaria exigua likely prefers warm, humid conditions. Keep the colony at 24-28°C, which is warm room temperature. Avoid temperatures below 20°C or above 32°C. No specific diapause requirements have been documented, these ants likely remain active year-round in captivity unless exposed to prolonged cool periods. Monitor colony activity: if workers become sluggish, consider slightly increasing temperature.

Frequently Asked Questions

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References