Pheidole obnixa

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Pheidole obnixa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. obnixa
Binomial name
Pheidole obnixa
Forel, 1912

Pheidole obnixa casent0908305 p 1 high.jpg

Pheidole obnixa casent0908305 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of obnixa .


See the description in the nomenclature section.

Keys including this Species


Buenos Aires, Córdoba, and Santa Fé, in Argentina. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality).

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.

  • obnixa. Pheidole arciruga r. obnixa Forel, 1912f: 236 (w.) ARGENTINA. Forel, 1913l: 231 (s.q.). Combination in P. (Elasmopheidole): Bruch, 1914: 219. Raised to species: Santschi, 1925e: 157. See also: Wilson, 2003: 138.

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


From Wilson (2003): Similar to Pheidole aberrans, Pheidole cavifrons and Pheidole longior, distinguished as follows.

Major: head comparatively short (Head Length/Head Width 1.2 mm, the same as aberrans, much shorter than cavifrons and longior); pronotal dorsum covered by widely spaced longitudinal carinulae, with those near the midline curving outward toward the rear; occiput covered by transverse carinulae; humerus, mesonotal convexity, and propodeal spines well developed; a low lobe present on profile of postpetiolar venter. Minor: pronotum covered by semicircular carinulae.

MEASUREMENTS (mm) Paralectotype major (Rosario de Santa Fé, Argentina): HW 1.20, HL 1.34, SL 0.50, EL 0.14, PW 0.60. Lectotype minor (Buenos Aires): HW 0.52, HL 0.54, SL 0.40, EL 0.08, PW 0.34.

COLOR Major: concolorous light brown.

Minor: mesosomal waist yellowish brown, head and gaster light brown.

Pheidole obnixa Wilson 2003.jpg

Figure. Upper: paralectotype, major (Rosario de Santa Fé, Argentina; only tentatively associated with lectotype minor). Lower: lectotype, minor (Buenos Aires, Argentina). Scale bars = 1 mm.

Lectotype Specimen Labels

Type Material

Buenos Aires, Argentina. Musee d'Histoire Naturelle Genève - as reported in Wilson (2003)


L obnixa, steadfast, resolute, allusion unknown. (Wilson 2003)


  • Bruch, C. 1914. Catálogo sistemático de los formícidos argentinos. Rev. Mus. La Plata 19: 211-234 (page 219, Combination in P. (Elasmopheidole))
  • Forel, A. 1912g. Formicides néotropiques. Part III. 3me sous-famille Myrmicinae (suite). Genres Cremastogaster et Pheidole. Mém. Soc. Entomol. Belg. 19: 211-237 (page 236, worker described)
  • Forel, A. 1913m. Fourmis d'Argentine, du Brésil, du Guatémala & de Cuba reçues de M. M. Bruch, Prof. v. Ihering, Mlle Baez, M. Peper et M. Rovereto. Bull. Soc. Vaudoise Sci. Nat. 49: 203-250 (page 231, soldier, queen described)
  • Santschi, F. 1925e. Fourmis des provinces argentines de Santa Fe, Catamarca, Santa Cruz, Córdoba et Los Andes. Comun. Mus. Nac. Hist. Nat. "Bernardino Rivadavia" 2: 149-168 (page 157, raised to species)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 138, fig. major, minor described)