Nesomyrmex mcgregori

Quick Summary

• Difficulty: Unknown, likely Expert
• Origin & Habitat: Endemic to South Africa's Northern Cape province. Found in natural Renosterveld vegetation on tillite soils. Known only from the Glen Lyon farm area near Nieuwoudtville. ^[1][2]
• Colony Type: Unconfirmed, colony structure has not been documented in scientific literature
• Size & Growth:
  • Queen: Size data unavailable, queen size has not been described
  • Worker: Size data unavailable, head measurements exist but total body length not recorded ^[1]
  • Colony: Unknown, only four specimens ever collected
  • Growth: Unknown
  • Development: Unknown, no development data exists for this species (No published data on development for this species.)
• Antkeeping:
  • Temperature: Unknown, no thermal studies exist. Based on its South African origin (Northern Cape, temperate climate), likely tolerates 15-25°C. Start around room temperature (20-22°C) and observe colony activity.
  • Humidity: Unknown, no humidity data exists. Renosterveld is a semi-arid fynbos shrubland, suggesting moderate to low humidity needs. Allow the nest to dry partially between water additions.
  • Diapause: Unknown, no overwintering data exists. South Africa's Northern Cape experiences mild winters, but the species may have a reduced activity period. Monitor for seasonal slowdowns.
  • Nesting: Ground-nesting species. In captivity, a test tube setup with moist substrate or a Y-tong (AAC), plaster, or soil nest would be appropriate. Provide a shallow water reservoir and allow portions of the nest to dry out between rehydrations.
• Behavior: Behavior is unstudied in captivity. Based on genus patterns, they are likely generalist foragers with moderate activity levels. Escape prevention should be moderate, workers are small but not among the tiniest ants. This species belongs to the Myrmicinae subfamily, which uses a smear defense mechanism (wiping venom onto enemies rather than piercing).
• Common Issues: extremely rare in the wild, captive colonies are essentially unavailable, no established husbandry guidelines exist for this species, growth and development timelines are completely unknown, humidity and temperature requirements are unconfirmed, risk of colony failure due to unknown care requirements

Species Discovery and Rarity

Nesomyrmex mcgregori was formally described in 2008 by Nokuthula Mbanyana and Hamish Robertson based on just four worker specimens collected from Glen Lyon farm in South Africa's Northern Cape province. This species represents one of the rarest ants in the Myrmicinae subfamily, with virtually no specimens found despite extensive sampling efforts including pitfall traps, Winkler bag extraction, and sweeping. The species was named after Neil McGregor, who owned the Glen Lyon farm and was instrumental in promoting research and conservation in the Nieuwoudtville region. The type locality features Renosterveld vegetation growing on tillite soils, a unique habitat in South Africa's semi-arid southwestern region. ^[1]

Identification and Morphology

Workers of Nesomyrmex mcgregori are small ants with a broad head (cephalic index 83-84). They have distinctive sculpturing, the median portion of the head dorsum is smooth or reticulate, not covered by longitudinal rugulae like similar species. The propodeum bears acute spines that are short and broad. Eyes contain 14-15 ommatidia in the longest row. The body is uniformly light brown in color. This species can be distinguished from the similar N. antoinetteae by its broader head, smoother head dorsum, and sharper propodeal spines. The species belongs to the N. simoni species group, characterized by specific sculpturing patterns and morphological features. ^[1]

Natural Habitat

This species is known only from Renosterveld vegetation in South Africa's Northern Cape province. Renosterveld is a unique fynbos shrubland ecosystem characterized by hard, nutrient-rich soils derived from tillite (a type of sedimentary rock). The region experiences hot, dry summers and mild, slightly wet winters. The Nieuwoudtville area where this species was found is renowned for its exceptional plant diversity, particularly during the spring wildflower season. The tillite soils create specific drainage and moisture conditions that likely influence where these ants nest. The species appears to be a ground-nesting ant based on the 2017 taxonomic review. ^[1][2]

Keeping an Extremely Rare Species

Nesomyrmex mcgregori is NOT a species recommended for antkeeping. This is one of the rarest ant species in the world with essentially no captive husbandry information available. No colonies have ever been documented in captivity, and the four known specimens represent the entirety of scientific knowledge about this species. There is no information on founding behavior, development timelines, temperature preferences, humidity needs, or diet. Attempting to keep this species would be purely experimental with a very high risk of colony failure. For antkeepers interested in Nesomyrmex, more common and well-documented species in the genus would be far better choices. If you somehow obtain specimens, treat every observation as potentially new scientific contribution and document your findings carefully.

Related Species in the Genus

The genus Nesomyrmex contains numerous species across Africa's tropical and temperate regions. The N. simoni species group to which N. mcgregori belongs includes several other South African endemics. Other Nesomyrmex species are more commonly studied and kept, though the genus remains relatively obscure in the antkeeping hobby. Species in this genus are generally small Myrmicinae ants that nest in soil or rotting wood. If you are interested in keeping ants from this genus, researching more widespread Nesomyrmex species would provide better husbandry guidance than attempting to maintain this extremely rare species.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References