Messor nondentatus

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to the Alxa League desert in Inner Mongolia, China. They nest in open gravel stony beaches at around 1172m elevation ^[1]. This is an arid desert environment.
• Colony Type: Colony structure is unconfirmed for this species. Based on typical Messor genus patterns, may be polygynous (multiple queens), but this requires verification.
• Size & Growth:
  • Queen: Size data unavailable, no documented measurements for queens
  • Worker: 7-8mm total length (major workers 8.02mm, range 7.73-8.27mm) ^[1]
  • Colony: Up to several thousand workers, estimated from related Messor species
  • Growth: Moderate
  • Development: Estimated 6-10 weeks at optimal temperature based on related Messor species (Development time inferred from genus patterns, direct measurements not available for this species)
• Antkeeping:
  • Temperature: Keep warm, around 24-28°C during active season. Desert origin means they tolerate higher temperatures well, a gradient of 24-32°C is ideal.
  • Humidity: Low to moderate, desert species prefer dry conditions. Keep nest substrate relatively dry with a small water tube for drinking access. Avoid damp conditions.
  • Diapause: Yes, temperate origin requires winter hibernation. Reduce temperature to 10-15°C for 3-4 months during winter.
  • Nesting: Dry, well-drained nests work best. Y-tong (AAC) or plaster nests with dry chambers suit this species. They prefer compact spaces scaled to their size.
• Behavior: Generally calm and non-aggressive for a large Messor species. Workers are robust and capable seed carriers. They forage for seeds and grains, storing them in granaries like other harvester ants. Major workers are present for seed processing. Escape risk is moderate, use standard barriers but they're not particularly good climbers. They may bite if threatened but are not dangerous to humans.
• Common Issues: desert species, overwatering is the most common mistake that kills colonies, limited distribution means captive stock is rare, finding established colonies is difficult, slow founding stage, queens need patience during the first few months, hibernation failure is common, ensure proper cooling period in winter, seed storage can mold if humidity is too high, keep nesting area dry

Natural History and Distribution

Messor nondentatus is one of the more recently described Messor species, formally named in 2009 by He and Song. This species has an extremely limited distribution, it has only been found in a small area near Hanwula village in the Alxa League (Alashan) region of Inner Mongolia, China. The type locality sits at about 1172 meters elevation in a desert environment characterized by open gravel and stony ground ^[1]. This is not a widespread species like many other Messor ants, you're unlikely to find it in the pet trade because it's only known from this one small region in the wild. The ants are completely black in color, relatively large at 7-8mm for workers, and have the unusual feature of having no teeth on their mandibles (hence the species name 'nondentatus') ^[1].

Nest Preferences and Housing

In the wild, these ants nest in open gravel stony beaches, essentially desert pavement with scattered stones. They don't build large mound nests but instead create chambers in the spaces between stones and gravel ^[1]. For captive care, this translates to needing a dry, well-drained nesting environment. Y-tong (AAC) nests work very well for Messor species because they allow you to control humidity precisely and keep the nest chambers relatively dry. Plaster nests are another good option. Test tubes can work for founding colonies but you'll need to monitor humidity carefully, these desert species are prone to mold problems if things get too damp. The nest should have chambers scaled to their robust 7-8mm worker size, and they appreciate having a foraging area where they can sort and process seeds.

Feeding and Diet

As a harvester ant, Messor nondentatus collects and stores seeds as their primary food source. In the wild, researchers found only grass (Gramineae) seeds in their nests, suggesting they specialize on grass seeds ^[1]. In captivity, offer a variety of seeds, millet, sunflower seeds, dandelion seeds, and commercial ant seed mixes work well. They also need protein for colony growth, so offer small insects like fruit flies, small crickets, or mealworms periodically. Unlike some ants, Messor species are true seed-harvesters and don't rely heavily on sugar water, though they may accept it occasionally. The major workers help process hard seeds by crushing them with their powerful mandibles. Keep food offerings dry, seeds can mold quickly in humid conditions.

Temperature and Seasonal Care

Being from the Inner Mongolia desert, this species is adapted to warm conditions with cold winters. During the active summer season, keep the nest at 24-28°C, with some warmer areas up to 30-32°C if using a heat gradient. They can tolerate higher temperatures than many ants thanks to their desert origin. As winter approaches, you'll need to simulate the cold period they experience in the wild. Reduce temperatures to around 10-15°C for 3-4 months, this is essential for their health and triggers proper reproductive cycles. A refrigerator or cool basement works well for winter storage. Do not skip hibernation, temperate Messor species that don't get proper winter rest often fail to produce new reproductives in spring.

Colony Development and Growth

Messor ants are typically claustral founders, the queen seals herself in a chamber and raises the first workers entirely on stored body fat, without needing to forage. However, founding behavior has not been specifically documented for this species. The first workers (nanitics) are typically smaller than normal workers. Once the colony has 10-20 workers, growth becomes more steady. Seed-harvesting colonies tend to grow at a moderate pace compared to purely predatory ants, they invest heavily in the queen and brood but don't have the rapid growth of some tropical species. Expect a well-established colony to reach several hundred workers over 2-3 years. The presence of major workers for seed processing is a sign of a healthy, mature colony.

Behavior and Temperament

Messor nondentatus has a generally calm temperament compared to some more aggressive ant species. They're not particularly territorial or aggressive toward humans, their defense is more passive (hiding in the nest) than attack-oriented. Workers are robust and active foragers, spending significant time collecting and processing seeds. They carry seeds back to the nest in their mandibles, storing them in dedicated granary chambers. Major workers assist with crushing hard seeds. They are not good climbers and don't typically escape aggressively, but standard barrier methods are still recommended. If threatened, they may bite, but their mandibles are designed for seed-crushing rather than stinging, and they're not considered dangerous to humans. ^[1]

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