Formica opaciventris

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Formica opaciventris
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Formicini
Genus: Formica
Species: F. opaciventris
Binomial name
Formica opaciventris
Emery, 1893

Formica opaciventris casent0104872 profile 1.jpg

Formica opaciventris casent0104872 dorsal 1.jpg

Specimen labels

This is an uncommon and ecologically conservative grassland species (Trager, pers. comm.) that lives in soil mounds or mounds with some thatching. In New Mexico it is found in Sagebrush scrub and meadows up to the edge of forests (Mackay and Mackay 2002).


Workers can be recognized as the posterior border is concave as seen in full-face view, and the propodeum is somewhat angulate as seen in profile. The pronotum has several spatulate hairs and the mesonotum has a few short, bristly hairs. The dorsum of the gaster has many scattered, short, bristly hairs and has sparse, silver, appressed pubescence. This species would be considered a member of the microgyna group if the posterior border was not concave. (Mackay and Mackay 2002)


Distribution based on Regional Taxon Lists

Nearctic Region: Canada, United States (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb





The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • opaciventris. Formica exsectoides var. opaciventris Emery, 1893i: 653 (w.m.) U.S.A. Gregg, 1952b: 14 (q.). Subspecies of exsectoides: Wheeler, W.M. 1913f: 484. Raised to species: Creighton, 1950a: 514.



  • Creighton, W. S. 1950a. The ants of North America. Bull. Mus. Comp. Zool. 104: 1-585 (page 514, raised to species)
  • Emery, C. 1893k. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 7: 633-682 (page 653, worker, male described)
  • Gregg, R. E. 1952b. The female of Formica opaciventris Emery (Formicidae). Psyche (Camb.) 59: 13-19. (page 14, queen described)
  • Wheeler, W. M. 1913i. A revision of the ants of the genus Formica (Linné) Mayr. Bull. Mus. Comp. Zool. 53: 379-565 (page 484, subspecies of exsectoides)

References based on Global Ant Biodiversity Informatics

  • Allred D. M. 1982. Ants of Utah. The Great Basin Naturalist 42: 415-511.
  • Cole A. C., Jr. 1954. Studies of New Mexico ants. XI. The genus Formica with a description of a new species (Hymenoptera: Formicidae). Journal of the Tennessee Academy of Science 29: 163-167.
  • Cover S. P., and R. A. Johnson. 20011. Checklist of Arizona Ants. Downloaded on January 7th at
  • Gregg, R.T. 1963. The Ants of Colorado.
  • Johnson R. Personnal Database. Accessed on February 5th 2014 at
  • Mackay W. P., and E. E. Mackay. 2002. The ants of New Mexico (Hymenoptera: Formicidae). Lewiston, New York: Edwin Mellen Press, 400 pp.
  • Mackay, W.P. and E. Mackay. XXXX. The Ants of New Mexico
  • Michigan State University, The Albert J. Cook Arthropod Research Collection. Accessed on January 7th 2014 at
  • Wheeler, G.C. and J. Wheeler. 1988. A checklist of the ants of Wyoming. Insecta Mundi 2(3&4):230-239