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 .

Identification

See the description in the nomenclature section.

Keys including this Species

Distribution

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

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Minor

Nomenclature

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.

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)

Etymology

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

References

  • 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)