Pheidole bergi

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Pheidole bergi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. bergi
Binomial name
Pheidole bergi
Mayr, 1887

Pheidole bergi casent0178008 profile 1.jpg

Pheidole bergi casent0178008 dorsal 1.jpg

Specimen labels

Synonyms

Bruch (1916) describes bergi as an abundant, widespread species in Argentina. It builds conspicuous soil nests, each with a single entrance hole 2–3 cm in diameter, often surrounded by a crater or partially by a semicircle of excavated soil as much as 25 cm in diameter. A single gallery descends to a succession of 5 to 10 roughly ellipsoidal chambers, each spaced about equally apart, and reaching a depth of 40–60 cm. The colonies are aggressive, with a high proportion of majors, and exclusively insectivorous. They readily attack other colonies of their own and other ant species. (Wilson 2003)

Photo Gallery

  • Pheidole bergi colony in agricultural area, Comodoro Rivadavia, Chubut Province, Argentina. October 2010. Photo by Robert Fuentalba Ojeda.

Identification

See the description in the nomenclature section.

Keys including this Species

Distribution

Uruguay, and widespread through Argentina, from Jujuy and Santa Fé in the north to Rio Negro in the south. (Wilson 2003)

Distribution based on Regional Taxon Lists

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

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.

  • bergi. Pheidole bergi Mayr, 1887: 593 (s.), 605 (w.) ARGENTINA. Senior synonym of goetschi, pulliventris, subparallela: Wilson, 2003: 269.
  • subparallela. Pheidole bergi subsp. subparallela Emery, 1906c: 145 (s.w.) URUGUAY. Junior synonym of bergi: Wilson, 2003: 269.
  • pulliventris. Pheidole bergi st. pulliventris Santschi, 1929d: 288 (s.) BRAZIL. Junior synonym of bergi: Wilson, 2003: 269.
  • goetschi. Pheidole goetschi Santschi, 1939e: 314, figs. 1, 2 (s.w.) ARGENTINA. Subspecies of bergi: Kusnezov, 1952b: 67 (in key). Junior synonym of bergi: Wilson, 2003: 269.

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): A medium-sized reddish brown (major) or brownish yellow (minor) member of the fallax group distinguished as follows.

Major: head subquadrate; propodeal spine moderately long and suberect; postpetiolar node from above roughly trapezoidal; mesonotal convexity prominent and symmetrical in shape in both side and dorsal-oblique views; rugoreticulum extends as a broad band from the eye to the circular carinulae of the antennal fossa; frontal lobes completely covered by longitudinal carinulae; carinulae mesad to the eye reach halfway between the eye and the occipital border.

Minor: occiput narrow, with nuchal collar; humerus smoothly rounded in dorsal-oblique view. Similar to Pheidole aenescens, Pheidole alienata, Pheidole chrysops, Pheidole cordiceps, Pheidole dentata, Pheidole dione, Pheidole eidmanni, Pheidole midas and Pheidole nitidula, differing in many details as described and illustrated.

MEASUREMENTS (mm) Syntype major: HW 1.94 (Cafayate, Argentina, major has HW 1.54), HL 2.08, SL 1.12, EL 0.32, PW 0.96. Minor (Cafayate): HW 0.56, HL 0.80, SL 1.10, EL 0.16, PW 0.38.

COLOR Major: body mostly light reddish brown; terminal gastral segments medium reddish brown.

Minor: concolorous brownish yellow.


Pheidole bergi Wilson 2003.jpg

Figure. Upper: major (compared with syntype major, and the left profile of the head belongs to the syntype). Lower: minor. ARGENTINA: Cafayate, Salta. Scale bars = 1 mm.

Type Material

Buenos Aires, Argentina. Naturhistorisches Museum Wien, Vienna and Museum of Comparative Zoology - as reported in Wilson (2003)

Etymology

Eponymous. (Wilson 2003)

References

  • Bruch, C. 1916. Contribución al estudio de las hormigas de la provincia de San Luis. Rev. Mus. La Plata 23: 291–357.
  • Mayr, G. 1887. Südamerikanische Formiciden. Verh. K-K. Zool.-Bot. Ges. Wien 37: 511-632 (page 593, 605, soldier described, worker described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 269, Senior synonym of subparallela, pulliventris goetschi, fig. major, minor described)