Messor muticus

Messor muticus

Messor muticus is a medium-sized harvester ant native to the steppe and forest-steppe regions of Eastern Europe and Western Asia. Workers measure 4-7mm with a brown to brownish-red head and mesosoma, while the gaster is dark brown. Major workers can be entirely dark brown. This species belongs to the Messor structor group and was only recently separated from M. structor through integrative taxonomy ^[1]. Queens are larger than workers and similarly sized to other structor-group species. The species has been recorded across a wide range including Greece, Bulgaria, Turkey, Armenia, Azerbaijan, Kazakhstan, Kyrgyzstan, Romania, Ukraine, and Russia ^[2][1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to steppe and forest-steppe regions of Eastern Europe and Western Asia. Found in areas with predominance of graminoids and complex-flowered plants. Also recorded nesting in urban parks in Iran ^[3].
• Colony Type: Polygynous colonies documented in laboratory settings, multiple egg-laying queens can coexist. Natural colonies contain 5,000-10,000 individuals depending on competition conditions ^[4].
  • Colony: Optionally polygyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Larger than workers, similarly sized to M. mcarthuri, M. ponticus and M. structor ^[1]. Signal: inferred from related species.
  • Worker: 4-7mm, medium sized, similarly sized as M. ibericus and M. structor, smaller than M. mcarthuri and M. ponticus ^[1].
  • Colony: Up to 5,000-10,000 workers in natural colonies ^[4].
  • Growth: Moderate, development takes approximately 8-10 weeks from egg to worker based on laboratory observations ^[4].
  • Development: 8-10 weeks at laboratory conditions (+21 to +25°C) ^[4]. (Temperature and stress have minimal effect on development speed but significantly affect queen behavior and egg-laying)
• Antkeeping:
  • Temperature: Keep at 21-25°C based on laboratory conditions. Reduced temperature (+21 to +25°C) helps reduce aggression between queens in polygynous colonies ^[4].
  • Humidity: Dry to moderate, these are steppe ants adapted to drier conditions. Provide some moisture but avoid overly damp nests.
  • Diapause: Yes, as a temperate species from steppe regions, they likely require a winter rest period. Specific duration unconfirmed.
  • Nesting: Y-tong (AAC) nests or plaster nests work well. Provide dry to moderately humid conditions. They are seed-harvesters so a foraging area with seeds is essential.
• Behavior: Harvester ant that collects and stores seeds. Queens can be kept together in polygynous colonies under proper conditions, sufficient nest volume and reduced temperature help reduce aggression ^[4]. Workers have a sting but cannot effectively use it against humans, injuries are inflicted only using mandibles ^[4]. Medium escape risk, use standard barrier methods.
• Common Issues: Queens may fight and kill each other if kept in too-small spaces or at higher temperatures, Overheating or too much humidity can cause colony decline, Seed storage is essential, they are harvester ants, Colony transfers can cause stress and queen deaths during integration

Housing and Nest Setup

Messor muticus does well in Y-tong (AAC) nests or plaster formicariums. These are steppe ants that prefer drier conditions, keep the nest moderately dry rather than damp. A foraging area is essential since they are harvester ants that collect seeds. You can provide a sand or soil mixture in the outworld where they can forage and store seeds. Test tubes work for founding colonies but you'll need to move them to a larger setup as the colony grows. Ensure escape prevention is adequate, while not tiny ants, they can still squeeze through small gaps. ^[4]

Feeding and Diet

As harvester ants, Messor muticus primarily collects and consumes seeds. In the wild, their diet includes seeds from graminoids, complex-flowered plants, and legumes such as Festuca valesiaca, Amaranthus retroflexus, Medicago sativa, Taraxacum officinale, and Plantago major ^[4]. In captivity, offer a variety of seeds including grass seeds, poppy seeds, and bird seed mixes. They also accept protein sources like small insects. Provide a constant supply of seeds in the foraging area, they will store them. Occasional protein offerings help support brood development.

Temperature and Seasonal Care

Keep colonies at 21-25°C based on laboratory conditions ^[4]. This temperature range supports normal development while helping reduce aggression between multiple queens. As a species from temperate steppe regions, they likely require a winter diapause period. During winter, reduce temperatures to around 10-15°C for several months to simulate natural seasonal cycles. This helps maintain colony health and may trigger reproductive behavior in spring. Avoid temperatures above 30°C as this can stress the colony.

Colony Structure and Multi-Queen Care

Messor muticus can form polygynous colonies with multiple egg-laying queens. Laboratory studies show that successful polygynous colonies require specific conditions: sufficient nest volume allowing multiple queens to mix their pheromones and produce identical markers for workers, and reduced temperature (+21 to +25°C) to slow metabolism and reduce aggression without stopping reproductive function ^[4]. Queens may fight and kill each other, especially in cramped conditions or at higher temperatures. If keeping multiple queens, provide ample space and maintain cooler temperatures. Only one colony in the laboratory study maintained dimaternity (two egg-laying queens) throughout the experiment.

Growth and Development

Development from egg to worker takes approximately 8-10 weeks at optimal temperatures ^[4]. The laboratory study observed larvae hatching in the second week, pupation around week 6,and first workers emerging around week 8. Temperature and stress have minimal effect on development speed but significantly affect queen behavior and egg-laying. Natural colonies can reach 5,000-10,000 individuals depending on competition conditions ^[4]. Growth is moderate, expect several months to a year before you have a substantial worker force.

Defense and Behavior

Messor muticus workers have a sting but cannot effectively use it, all injuries between ants are inflicted using mandibles ^[4]. They are not considered dangerous to humans. These are relatively peaceful harvester ants that focus on seed collection. Workers are active foragers who will search the foraging area for seeds and protein. They store seeds in the nest, similar to other Messor species. The colony may become more defensive if threatened, but they are not aggressive toward keepers.

Frequently Asked Questions

References