Pheidole obnixa

Nothing is known about the biology of obnixa .

Identification
See the description in the nomenclature section.

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

Distribution based on Regional Taxon Lists
Neotropical Region: Argentina.

Worker
Minor

Nomenclature

 *  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.

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.



'''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.'''

Type Material
Buenos Aires, Argentina. - as reported in Wilson (2003)

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

References based on Global Ant Biodiversity Informatics

 * Bruch C. 1914. Catálogo sistemático de los formícidos argentinos. Revista del Museo de La Plata 19: 211-234.
 * Cuezzo, F. 1998. Formicidae. Chapter 42 in Morrone J.J., and S. Coscaron (dirs) Biodiversidad de artropodos argentinos: una perspectiva biotaxonomica Ediciones Sur, La Plata. Pages 452-462.
 * Forel A. 1913. Fourmis d'Argentine, du Brésil, du Guatémala & de Cuba reçues de M. M. Bruch, Prof. v. Ihering, Mlle Baez, M. Peper et M. Rovereto. Bulletin de la Société Vaudoise des Sciences Naturelles. 49: 203-250.
 * Gallardo A. 1932. El subgénero Elasmopheidole en la República Argentina (Himenopteros Formicidos). Revista Chilena de Historia Natural 36: 178-182.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Vittar, F. 2008. Hormigas (Hymenoptera: Formicidae) de la Mesopotamia Argentina. INSUGEO Miscelania 17(2):447-466
 * Vittar, F., and F. Cuezzo. "Hormigas (Hymenoptera: Formicidae) de la provincia de Santa Fe, Argentina." Revista de la Sociedad Entomológica Argentina (versión On-line ISSN 1851-7471) 67, no. 1-2 (2008).