Pheidole rudigenis

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Pheidole rudigenis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. rudigenis
Binomial name
Pheidole rudigenis
Emery, 1906

Pheidole rudigenis casent0178049 profile 1.jpg

Pheidole rudigenis casent0178049 dorsal 1.jpg

Specimen labels

Synonyms

The Itaúnas series was collected by R. Paiva inside a nest of a giant ponerine ant, ‘’Dinoponera’’ sp.; the relationship, if any, is unknown. (Wilson 2003)

Identification

See the description in the nomenclature section.

Keys including this Species

Distribution

In addition to the types, I have seen a series from Itaúnas, Espirito Santo, southeastern Brazil. The holotype of synonymous Pheidole bucolica is from Monte Alegre, Pará, in Amazonian Brazil, an anomalous record for the species. (Wilson 2003)

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Minor

Major

Nomenclature

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

  • rudigenis. Pheidole flavens subsp. rudigenis Emery, 1906c: 155 (s.) ARGENTINA. Raised to species and senior synonym of bucolica: Wilson, 2003: 498.
  • bucolica. Pheidole bucolica Santschi, 1929d: 289, figs. 19-21 (s.) BRAZIL. Junior synonym of rudigenis: Wilson, 2003: 498.

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

Description

DIAGNOSIS From Wilson (2003): Similar to Pheidole exigua, Pheidole glomericeps, Pheidole moffetti, Pheidole nana and Pheidole styrax, differing as follows.

Major: shallow antennal scrobes present; occipital lobes and humeri rugoreticulate; dorsal surfaces of head and pronotum otherwise carinulate; dorsal promesonotal profile elevated, strongly convex, mesonotal convexity subangulate; propodeal spines half the length of the propodeal dorsal face; postpetiolar node from above diamond-shaped.

Minor: space between eye and antennal fossa, as well as anterior third of promesonotal dorsum, rugoreticulate; entire head and mesosoma foveolate and opaque; propodeal spines half as long as propodeal basal face; occiput broad and convex.

The holotype of Pheidole bucolica, placed in provisional synonymy, differs from the rudigenis lectotype in its oval postpetiole, as depicted, and more strongly rugulose genae; given its distant origin, in Pará, it may be a distinct species.

MEASUREMENTS (mm) Lectotype major: HW 1.04, HL 1.02, SL 0.56, EL 0.14, PW 0.50. Paralectotype minor: HW 0.54, HL 0.60, SL 0.52, EL 0.08, PW 0.36.

COLOR Major: head, mesosoma, and waist light reddish brown; gaster and antennae medium brownish yellow; legs light brownish yellow.

Minor: head and mesosoma medium yellowish brown; waist, gaster, and appendages light yellowish brown.


Pheidole rudigenis Wilson 2003.jpg

Figure. Upper: lectotype, major (second, lower outline of postpetiole dorsum is of synonymous bucolica holotype). Lower: paralectotype, minor. Scale bars = 1 mm.

Type Material

ARGENTINA: San Pedro, Misiones. (Wilson 2003) - as reported in Wilson (2003)

Etymology

L rudigenis, rough cheek, referring to sculpturing of head. (Wilson 2003)

References

  • Emery, C. 1906c [1905]. Studi sulle formiche della fauna neotropica. XXVI. Bull. Soc. Entomol. Ital. 37: 107-194 (page 155, soldier described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 498, fig. major, minor described, Senior synonym of bucolica, Raised to species: new status)