Veromessor smithi

Veromessor smithi

Veromessor smithi is a small seed-harvester ant native to the southwestern United States. Workers are yellowish-red to dull reddish or reddish-brown in color, measuring around 1.3-1.6mm in head width. They are monomorphic, meaning all workers are the same size. These ants are crepuscular and nocturnal foragers, meaning they search for food at dawn and dusk rather than during the day. Nests are found in open, exposed areas at elevations between 760-2,275 meters, typically featuring one or two small circular crater entrances about 10-15cm in diameter ^[1].

This species is closely related to V. lobognathus and occurs across multiple ecoregions including the Great Basin, Mohave Desert, and Western Grasslands. Colonies remain relatively small, with one excavated nest containing 275 workers along with one dealate queen,27 alate queens, and 97 males. They are sister species to V. lobognathus and likely have similar care requirements to other Veromessor seed-harvesters ^[2][1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southwestern United States including Nevada, Arizona, California, Colorado, New Mexico, and Oregon. Found in pinyon pine-juniper habitats, Great Basin shrub steppe, Colorado Plateau shrublands, and Mohave Desert ecoregions at elevations 760-2,275m ^[1][2].
• Colony Type: Likely monogyne (single queen colony). One excavated colony contained a single dealate queen with 27 alate queens and 97 males present, suggesting polygynous production of sexuals but single queen structure ^[1].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 6-8mm (estimated based on genus-level data)
  • Worker: 1.3-1.6mm head width ^[1]
  • Colony: Up to approximately 500 workers in mature colonies, one excavated colony had 275 workers ^[1][2]
  • Growth: Moderate, small colony size suggests moderate growth rate
  • Development: Estimated 6-10 weeks based on related Veromessor species (no specific data for V. smithi) (Development time inferred from genus-level data, actual timeline may vary)
• Antkeeping:
  • Temperature: Keep at 22-26°C. These ants are native to desert and grassland habitats with warm summer temperatures. Provide a temperature gradient allowing workers to self-regulate ^[2].
  • Humidity: Low to moderate humidity (30-50%). Native to arid desert and shrub steppe regions. Keep nest substrate relatively dry with a small water tube for drinking water ^[1].
  • Diapause: Yes, likely requires a winter rest period (diapause) of 2-3 months at 10-15°C, consistent with other Veromessor species from temperate regions ^[2].
  • Nesting: Use a dry nest setup. Y-tong (AAC) or plaster nests work well given their preference for arid conditions. Provide a small water source. Natural nests are under stones or in open ground with crater entrances ^[1].
• Behavior: These ants are peaceful and not aggressive. Workers forage solitarily at night and during twilight hours, characteristic of their crepuscular-nocturnal activity pattern ^[1][3]. They are seed harvesters and will collect and store seeds. Escape risk is low, they are not particularly good climbers and are medium-sized, but standard escape prevention (fluon on edges) is still recommended ^[4][5].
• Common Issues: colonies may fail if kept too humid, these are desert ants that prefer dry conditions, nocturnal foraging means they may be less active during daytime hours when keepers observe them most, small colony sizes mean slower population growth than faster-growing species like Formica or Camponotus, wild-caught colonies may contain parasites that can decimate the colony in captivity, seed-harvester ants may ignore liquid sugar sources, offer seeds as primary carbohydrate source

Housing and Nest Setup

Veromessor smithi does well in dry nest setups. A Y-tong (acrylic) nest 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. The natural nesting habitat is under stones or in open ground with small crater entrances, so mimic this by providing 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 in a location with natural light cycles so they can adjust their activity to dawn/dusk. A small water test tube with a cotton plug should always be available, these ants get their moisture primarily from drinking water and from seeds rather than from humidity ^[1][2].

Feeding and Diet

As seed-harvester ants, V. smithi primarily collects and stores seeds. In captivity, offer a variety of seeds including grass seeds, millet, and small bird seed mixes. They will crack open seeds to eat the starchy interior, similar to how other Veromessor and Messor species process seeds ^[5][3].

For protein, offer small insects like fruit flies, small crickets, or mealworms. Since they are solitary foragers rather than recruiters, place food items in the outworld and allow workers to discover them on their own. They may also accept small amounts of honey or sugar water, but seeds should form the bulk of their diet ^[3][4].

Feed seeds constantly available, with protein offerings 1-2 times per week. Remove any uneaten seeds or prey after 2-3 days to prevent mold.

Temperature and Seasonal Care

Keep V. smithi at temperatures between 22-26°C during the active season. These ants are native to desert and grassland regions of the southwestern US where summer temperatures can get quite high, so they can tolerate the warmer end of this range. Provide a temperature gradient by placing the heat source on one side of the nest so workers can self-regulate ^[2].

During winter, these ants require a diapause (hibernation) period. Reduce temperatures to 10-15°C for 2-3 months, typically from late November through February in the Northern Hemisphere. This mimics the natural seasonal cycle and helps trigger reproductive behavior the following spring. Reduce food offerings during diapause but maintain access to water ^[2].

Behavior and Observation

V. smithi workers are solitary foragers, meaning they search for food individually rather than recruiting nestmates. This is unusual among ants and reflects their crepuscular-nocturnal foraging strategy. Workers have large eyes adapted for low-light conditions, they have the largest facet diameter among Veromessor species, which helps them see during dawn and dusk forays ^[6].

These ants are not aggressive and rarely sting. They are peaceful colony residents that go about their business quietly. Because they forage at night, you may notice most activity in the evening hours. They are not escape artists like some tiny ants, but standard escape prevention with fluon on container edges is still recommended ^[1][6].

Colony Development

Colonies remain relatively small compared to many common ant species. The largest documented colony had around 275 workers, and the genus Veromessor is characterized by small colony sizes typically under 5000 workers ^[1][2]. This means you should expect slower population growth than species like Formica or Camponotus.

Mating flights occur in late June through July, when sexuals (alates) leave the nest. If you keep a mature colony, you may observe alate production during these months. One interesting note: researchers found a brachypterous (short-winged) dealate queen in one nest, suggesting some flexibility in queen morphology ^[1].

Frequently Asked Questions

References