Temnothorax coleenae

Quick Summary

• Difficulty: Expert
• Origin & Habitat: South‑central New Mexico, USA, in creosote bush (Larrea tridentata) desert bajada habitat ^[1]. This is classic Chihuahuan Desert terrain, hot, dry, with sparse vegetation.
• Colony Type: Unknown. Only a single worker has ever been collected, so colony structure has not been documented. Based on typical Temnothorax patterns, likely single‑queen colonies ^[1].
• Size & Growth:
  • Queen: Undescribed, no queen specimens have been found ^[1].
  • Worker: Size data unavailable. The only known worker is very small (head length 0.66 mm), but total body length has not been reported ^[1].
  • Colony: Unknown, only a single specimen has ever been collected ^[1].
  • Growth: Unknown, no colony data exists.
  • Development: Unconfirmed, no data exists for this species. (No direct development data exists.)
• Antkeeping:
  • Temperature: Keep warm, around 22-26 °C. As a desert species it can tolerate higher temperatures, but avoid extremes. Provide a gentle gradient so workers can choose their preferred zone.
  • Humidity: Low to moderate. Desert species prefer drier conditions, keep the nest substrate mostly dry with a small moist area. Avoid waterlogging.
  • Diapause: Likely yes. Most temperate and desert Temnothorax require a winter rest period. Provide 3-4 months at 10-15 °C during winter.
  • Nesting: Y‑tong (AAC) nests work well for these tiny ants, narrow chambers suit their size. Keep ventilation high to prevent mould.
• Behavior: Very little is known about their behavior in captivity. Based on morphology (large eyes, pale color), they are likely nocturnal or crepuscular, active during cooler hours. Workers are tiny and can escape through very small gaps, so escape prevention is critical. Expect them to be shy and non‑aggressive, typical of Temnothorax. They likely forage individually rather than in trails. This species belongs to the Crematogastrini tribe, which uses a smear defense, workers wipe venom onto attackers rather than stinging (general taxonomic knowledge).
• Common Issues: only one specimen ever collected, colonies have never been found or kept in captivity, no established care guidelines exist because the species is effectively unknown in the hobby, tiny size means escapes are likely without fine mesh or a well‑sealed setup, desert origin: may not tolerate high humidity, allow the nest to dry out between waterings, winter dormancy requirements are inferred, not confirmed, wrong temperature could kill the colony

Discovery and Rarity

Temnothorax coleenae is one of the rarest ant species in North America. The entire scientific knowledge of this species comes from a single worker collected in a pitfall trap on July 6,1984,in Doña Ana County, New Mexico ^[1]. Despite extensive trapping efforts by numerous researchers over several years, covering all seasons and both day and night, no additional specimens have been found ^[1]. This makes keeping T. coleenae almost impossible, no captive colonies have ever been established, and wild colonies have never been located. The species was originally described as Leptothorax (Myrafant) coleenae and later moved to Temnothorax by Bolton in 2003. The name honors Colleen 'Coco' Adelia Whitford ^[1].

Identification and Morphology

This species is unmistakable among North American Temnothorax. The combination of pale yellow body with large, jet‑black eyes is striking and unique ^[1]. Workers have a 12‑segmented antenna, and the head is almost entirely covered in small punctures (tiny depressions), unlike similar species which have smooth, shiny areas. The petiole has a well‑developed ventral flange on the anterior peduncle, ending in a blunt tooth. Propodeal spines are short and flattened laterally. The eyes are unusually large, occupying about one‑third of the head length with approximately 115 facets, clear evidence of nocturnal adaptation ^[2].

Natural Habitat

Temnothorax coleenae lives in the Chihuahuan Desert, one of the most arid desert regions in North America. The type locality features creosote bush (Larrea tridentata) vegetation on a bajada, a gently sloping fan of sediment at the base of mountains ^[1]. This habitat is characterised by extreme temperatures, very low rainfall, and sparse vegetation. T. coleenae is one of seven Temnothorax species that inhabit this desert region, along with T. andersoni, T. bestelmeyeri, T. cokendolpheri, T. neomexicanus, T. liebi, and T. bristoli ^[1]. Its large eyes and pale coloration suggest this species avoids daytime heat by being active at night, a common strategy among desert ants.

Keeping This Species

Since no one has ever kept T. coleenae in captivity, care must be based on inference from related species and its desert habitat. Provide a warm, relatively dry environment, aim for temperatures in the low‑to‑mid 20s Celsius with some variation. A Y‑tong (AAC) nest with narrow chambers suits their tiny size. Escape prevention is critical, these ants can squeeze through gaps that seem impossible. Use fluon on container edges and ensure any gaps in tubing are sealed. Foraging likely occurs at night, so offer small prey like fruit flies or springtails. Sugar water or honey can be offered occasionally. During winter, provide a cool period around 10-15 °C for 3-4 months, this follows patterns seen in other temperate Temnothorax. The biggest challenge is simply obtaining a colony: this species has never been found in sufficient numbers for study. It is not available in the hobby trade, and collecting from the wild is extremely unlikely to succeed. ^[1]

Frequently Asked Questions

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References