Pheidole crassicornis

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Pheidole crassicornis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. crassicornis
Binomial name
Pheidole crassicornis
Emery, 1895

Pheidole crassicornis casent0104291 profile 1.jpg

Pheidole crassicornis casent0104291 dorsal 1.jpg

Specimen Label

From Wilson (2003): "In northern Florida, Naves (1985) found the species sympatric with Pheidole diversipilosa, nesting in deep soil in forest clearings. The inconspicuous nest openings were never surrounded by craters of excavated soil of the kind common in other soil-dwelling species of Pheidole, and the vertical galleries ran at least 60 cm deep. Minors and occasionally majors foraged 4 meters or more from the nest entrances, and minors were observed retrieving live termites and small dead arthropods. In western Texas, Moody and Francke (1982) found colonies at 100–1700 m, nesting under stones and in open soil."


See the description in the nomenclature section.

Keys including this Species


North Carolina to northern Florida and west to western Texas. (Wilson 2003)

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb





The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • crassicornis. Pheidole crassicornis Emery, 1895c: 296 (s.) U.S.A. Forel, 1901e: 350 (w.m.). See also: Wilson, 2003: 152.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


From Wilson (2003): A member of the crassicornis group distinguished by the following combination of traits.

Major: thickened basal portion of scape strongly curved toward the insertion, as illustrated; pilosity very sparse, usually almost absent from the head and gaster; humerus subangulate in dorsal-oblique view; pronotal dorsum marginally carinulate.

Minor: all of dorsal surface of head except middle of clypeus and frontal triangle, as well as all of mesosoma and waist, foveolate and opaque.

See also Pheidole diversipilosa, Pheidole porcula, Pheidole tetra and Pheidole vallicola.

MEASUREMENTS (mm) Major (Belmont, North Carolina): HW 1.30, HL 1.30, SL 0.78, EL 0.20, PW 0.64. Minor (Belmont, North Carolina): HW 0.62, HL 0.74, SL 0.84, EL 0.10, PW 0.44.

COLOR Major: concolorous brownish yellow.

Minor: concolorous yellowish brown.

Pheidole crassicornis Wilson 2003.jpg

Figure. Upper: major. Lower: minor. Scale bars = 1 mm.

Type Material

NORTH CAROLINA: Belmont, Gaston Co., near Charlotte. (Labeled to species by Carlos Emery and likely part of his type series; the type locality is Charlotte.) Musee d'Histoire Naturelle Genève and presumably Museum of Comparative Zoology - as reported in Wilson (2003)


L crassicornis, thick horn, referring to the expanded basal part of the antennal scape. (Wilson 2003)


  • Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 257-360 (page 296, soldier described)
  • Forel, A. 1901j. Variétés myrmécologiques. Ann. Soc. Entomol. Belg. 45: 334-382 (page 350, worker, male described)
  • Moody, J. V., Francke, O. F. 1982. The ants (Hymenoptera, Formicidae) of western Texas, Part 1: Subfamily Myrmicinae. Grad. Stud. Tex. Tech Univ. 27: 1–80.
  • Naves, M. A. 1985. A monograph of the genus Pheidole in Florida, USA (Hymenoptera: Formicidae). Insecta Mundi 1: 53–90.
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. 152, fig. major, minor described)