Veromessor smithi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southwestern United States (Arizona, California, Colorado, Nevada, New Mexico, Oregon). Found in pinyon-juniper woodlands, Great Basin shrub steppe, Colorado Plateau shrublands, and Mohave desert ecoregions, at elevations 760-2,275 m ^[1][3].
• Colony Type: Likely monogyne (single queen colony). One excavated colony contained a single dealate queen plus 27 alate queens, suggesting the colony produces many alates but has only one functional queen ^[1].
• Size & Growth:
  • Queen: Total length not directly recorded, queens of Veromessor typically reach about 8-10 mm (inferred from genus-level data).
  • Worker: Head width ~1.3-1.6 mm ^[1], total body length estimated at 4-6 mm based on related Veromessor.
  • Colony: Up to several hundred workers, the largest recorded wild colony had 275 workers ^[1]. Genus Veromessor colonies are small, generally under 5,000 workers ^[3].
  • Growth: Moderate, colonies grow slowly due to small size and solitary foraging habits.
  • Development: Estimated 6-10 weeks based on related Veromessor species (no specific data for V. smithi). (Development time inferred from congeneric species, actual timeline may vary.)
• Antkeeping:
  • Temperature: Keep at 22-26°C during active season. Provide a temperature gradient so workers can self-regulate. These ants come from hot desert and grassland regions, so they can handle the warmer end of this range ^[3].
  • Humidity: Low. Keep the nest substrate dry, provide a small water tube with a cotton plug for drinking. Avoid condensation and high humidity, which can cause mold and colony decline ^[1].
  • Diapause: Yes. Requires a winter diapause of 2-3 months at 10-15°C (typically November-February). This rest period is important for colony health and next season’s reproduction ^[3].
  • Nesting: Dry nest setup. Y-tong (AAC) or plaster formicaria work well. Mimic natural nesting under stones or in open ground with small crater entrances ^[1].
• Behavior: Peaceful and not aggressive. Workers forage solitarily at dusk and night ^[1][2]. They are seed harvesters and will collect and store seeds. Escape risk is low for their size, but standard prevention (fluon or PTFE tape on container edges) is recommended. They have large eyes adapted for low-light conditions ^[4].
• Common Issues: colonies may fail if kept too humid, these are desert ants that prefer dry nesting substrate, nocturnal foraging means workers are most active at dawn and dusk, which can make daytime observation less rewarding, small colony size leads to slow population growth, expect steady but not explosive growth, wild-caught colonies may carry parasites (e.g., phorid flies) that can devastate a captive colony, seed-harvester ants primarily eat seeds, provide a variety of small seeds as their main food and offer occasional protein (small insects)

Housing and Nest Setup

Veromessor smithi does well in dry nest setups. A Y-tong (AAC) or plaster formicarium works well, these provide the arid conditions these desert ants prefer. Avoid overly humid setups that can cause fungal problems and colony decline. Their natural nests are under stones or in open ground with small crater entrances, so mimic this by offering a relatively compact nest chamber ^[1].

For the outworld (foraging area), use a standard container with smooth walls treated with fluon to prevent escapes. Since they are nocturnal foragers, place the nest where natural light cycles allow them to adjust their activity to dusk and dawn. A small water tube with a cotton plug should always be available, these ants get moisture from drinking water and from seeds rather than from high humidity ^[1][3].

Feeding and Diet

As seed-harvester ants, Veromessor smithi primarily collects and stores seeds. In captivity, offer a variety of small seeds, such as grass seeds, millet, and crushed bird seed. They crack open seeds to eat the starchy interior, similar to other Veromessor and Messor species ^[5][2].

For protein, offer small insects like fruit flies, small crickets, or mealworms. Because workers forage solitarily rather than recruit, place food items in the outworld and let workers discover them individually. They may also accept small amounts of honey or sugar water, but seeds should form the bulk of their diet ^[2][6].

Keep seeds available at all times, and offer protein once or twice per week. Remove uneaten seeds or prey after 2-3 days to prevent mold.

Temperature and Seasonal Care

Keep Veromessor smithi at 22-26°C during the active season. These ants are native to the hot, dry regions of the southwestern US, so they tolerate the warmer end of this range. Place a heat source on one side of the nest to create a temperature gradient, allowing workers to choose their preferred temperature ^[3].

During winter, they need a diapause (hibernation) period. Reduce temperature to 10-15°C for 2-3 months, typically from late November through February (Northern Hemisphere). This mimics the natural seasonal cycle and is important for colony health and future reproduction. During diapause, reduce food but maintain access to water ^[3].

Behavior and Observation

Veromessor smithi workers are solitary foragers, they search for food individually instead of recruiting nestmates. This is unusual among ants and fits their crepuscular-nocturnal lifestyle ^[1][2]. They have unusually large eye facets for their size, the largest of any Veromessor, which helps them see in dim light ^[4].

These ants are peaceful and rarely sting. They are quiet colony residents that focus on seed gathering. Because they forage at night, you’ll see most activity in the evening hours. They are not escape specialists, but standard prevention (fluon on container rims) is still wise ^[1][4].

Colony Development

Colonies stay relatively small. The largest documented wild colony had 275 workers, and the genus Veromessor is characterized by small colonies, typically under 5,000 workers ^[1][3]. Expect slow, steady growth rather than explosive population increases.

Mating flights happen in late June through July, based on alates found in nests from June 12 to July 27 ^[1]. If you keep a mature colony, you may see alates during these months. One nest also contained a brachypterous (short-winged) dealate queen, hinting at some flexibility in queen morphology ^[1].

Note: Long-term studies on protopectinase found that this species does not produce the enzyme that softens plant cell walls, so they rely on physical processing of seeds ^[7].

Frequently Asked Questions

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References