Pheidole obtusopilosa

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Pheidole obtusopilosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. obtusopilosa
Binomial name
Pheidole obtusopilosa
Mayr, 1887

Pheidole obtusopilosa casent0919785 p 1 high.jpg

Pheidole obtusopilosa casent0919785 d 1 high.jpg

Specimen Labels

A collection of obtusopilosa was made by William L. Brown at the Boraceia Biological Station, near Salesópolis, São Paulo, in wet mountain forest at 850 m. (Wilson 2003)


See the description in the nomenclature section.

Keys including this Species


Recorded from Uruguay; and, in Argentina, the northern and central provinces of Buenos Aires, Córdoba, Jujuy, La Pampa, and Tucumán (Kempf 1972b). I have confirmed a series from São Paulo. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil, Uruguay (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Kempf (1974) reported that Oxyepoecus bruchi were collected with P. obtusopilosa in Alta Gracia and La Granja, Córdoba, Argentina.



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

  • obtusopilosa. Pheidole obtusopilosa Mayr, 1887: 586 (s.), 602 (w.) URUGUAY. Santschi, 1917f: 278 (m.); Santschi, 1926d: 7 (q.). See also: Wilson, 2003: 477.

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


From Wilson (2003): DIAGNOSIS Similar to Pheidole heterothrix, distinguished from it and other Pheidole species by the following combination of traits.

Major: entire dorsal surface of head rugoreticulate except for frontal lobes, frontal triangle, clypeus, and anterior genae; humeri rugoreticulate; anterior margin of pronotal dorsum carinulate; all of mesosoma and waist foveolate; postpetiole from above elliptical.

Minor: almost all of body except gaster foveolate and opaque; humeri subangulate; propodeal spines moderately long and slender; occipital margin concave; nuchal collar absent.

MEASUREMENTS (mm) Lectotype major: HW 1.16, HL 1.18, SL 0.54, EL 0.14, PW 0.60. Paralectotype minor: HW 0.56, HL 0.58, SL 0.50, EL 0.10, PW 0.36.

COLOR Major: body light reddish brown except for gaster, which is plain medium brown.

Pheidole obtusopilosa Wilson 2003.jpg

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

Type Material

URUGUAY Naturhistorisches Museum Wien, Vienna - as reported in Wilson (2003)


L obtusopilosa, blunt-haired, allusion uncertain. (Wilson 2003)


  • Mayr, G. 1887. Südamerikanische Formiciden. Verh. K-K. Zool.-Bot. Ges. Wien 37: 511-632 (page 586, 602, soldier described, worker described)
  • Santschi, F. 1917f. Description de quelques nouvelles fourmis de la République Argentine. An. Soc. Cient. Argent. 84: 277-283 (page 278, male described)
  • Santschi, F. 1926d. Deux nouvelles fourmis parasites de l'Argentine. Folia Myrmecol. Termit. 1: 6-8 (page 7, queen described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 477, fig. major, minor described)