Novomessor cockerelli

Distinguished from the similar Novomessor albisetosus by head shape. The two prominent propodeal spines are diagnostic for the genus. Large size, long legs, and elongated head separate it from most co-occurring desert ants.

Large brown ant with blackish gaster, long legs, and elongated head. Two distinctive spines present on the propodeum. Cannot sting but possesses powerful mandibles and is highly aggressive.

Upland plains and desert areas with ocotillo (Fouquieria splendens), cactus, creosote bush, mesquite, sagebrush, and thorn scrub. Found at elevations of 518–1,877 m (1,699–6,158 ft). Nests are constructed in open ground or beside rocks, often surrounded by a midden of tiny pebbles and plant remains.

Southwestern United States (Texas, New Mexico, Arizona, Nevada, California) and northern Mexico (Sonora, Chihuahua, Durango, Coahuila, Nuevo León).

Workers forage daily in early morning and evening when ground temperature is 20–40°C (68–104°F). During winter, foraging may occur throughout the day. Nuptial flights observed in July at dusk in the Chihuahuan Desert.

Omnivorous: seeds, plant material, and dead insects. Nearly half of diet consists of insect corpses; workers scavenge carcasses for flies and other dead insects.

Colonies contain a single queen. Nuptial flights occur in July at dusk. Newly mated females remove their wings and must found new colonies independently; they are prevented from entering established nests by workers. Workers isolated from the queen can lay viable eggs that develop into males, but queen-produced larvae inhibit worker egg-laying, serving as a mechanism to regulate reproduction in physically separated subnests.

Forms large underground colonies, sometimes with multiple entrances. Workers recruit nestmates to large food items using pheromones: initial glandular secretion attracts workers within ~2 meters, with trail pheromones laid if additional assistance needed. Trails are short-lived. Engages in interspecific competition: workers plug entrance holes of neighboring Pogonomyrmex barbatus colonies with grit and small stones, delaying their emergence; nests closer and older/larger nests are targeted more frequently. Uses path integration and visual panorama cues for navigation, with dynamic weighting—initially following path integrator vector, then switching to panorama-based navigation after several meters. In visually sparse habitats, path integration receives heavier weighting.

Seed disperser and scavenger in desert ecosystems. Competitor with other seed-eating ants, particularly Pogonomyrmex barbatus. Predator/scavenger on dead insects.

• Novomessor albisetosusSimilar overall appearance; distinguished by head shape
• Pogonomyrmex barbatusCo-occurring seed-eating competitor; N. cockerelli plugs its nest entrances to delay foraging

• desert ant
• seed harvester
• scavenger
• competitive behavior
• navigation
• path integration
• pheromone recruitment
• polydomous
• monogynous

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bembicid Holdings | Entomology Research Museum
• UC Davis Researcher Targeting Zebra Chip: It's Not a Chip You Want | Bug Squad
• Encyrtid Holdings | Entomology Research Museum
• Publications | Entomology Research Museum
• Psyllid Movements Revealed Via Gut Content Analysis
• Wasps Used to Combat Citrus Greening Disease are Unlikely to Threaten Non-target Insects
• Larval regulation of worker reproduction in the polydomous ant Novomessor cockerelli
• Regulation of worker reproduction in the polydomous ant speciesNovomessor cockerelli
• Colony Founding, Queen Control andWorker Reproduction in the AntAphaenogaster (=Novomessor) Cockerelli(Hymenoptera: Formicidae)
• Traveling through light clutter: Path integration and panorama guided navigation in the Sonoran Desert ant, Novomessor cockerelli