Pheidole rosae

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Pheidole rosae
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. rosae
Binomial name
Pheidole rosae
Forel, 1901

MCZ-ENT00020699 Pheidole silvestri hal.jpg

MCZ-ENT00020699 Pheidole silvestri had.jpg

Type Specimen Label


An inhabitant of subtropical forests. Winged queens and males were present in a nest near Tapia, Tucumán, on 25 January, col. W. L. Brown. (Wilson, 2003)


See the description in the nomenclature section.

Keys including this Species


From Wilson (2003): Recorded from Santa Catarina (type locality) and, as the synonymous “silvestrii,” from Tucumán (type locality), Buenos Aires, and Córdoba, Argentina (Kempf 1972b; W. L. Brown).

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Kempf (1974) reported that Oxyepoecus bruchi were collected with P. rosae in Argentina. An observation nest created from a collection of rosae that contained both species found no hostility between these ants.


Nest entrance of P. rosae. Photo by Alex Wild.


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

  • rosae. Pheidole rosae Forel, 1901h: 63 (s.) BRAZIL. Senior synonym of silvestrii: Wilson, 2003: 742.
  • silvestrii. Pheidole silvestrii Emery, 1906c: 146 (s.w.q.) ARGENTINA. Junior synonym of rosae: Wilson, 2003: 742.

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


From Wilson (2003): DIAGNOSIS Similar in various characters to Pheidole guayasana, Pheidole pidax, Pheidole rosula and Pheidole securigera, distinguished as follows.

Major: reddish yellow; frontal lobes extended forward as conspicuous lobes, as seen in side view; wide, shallow antennal scrobe present; promesonotum descends abruptly and obliquely to metanotum; postpetiolar node spinose; portions of anterior pronotal dorsum and propodeal dorsum carinulate, and rest of mesosoma smooth and shiny.

Minor: several carinulae extend from frontal lobes to occiput, center of occiput carinulate, and rest of posterior dorsal head surface smooth; propodeal spines reduced to denticles.

MEASUREMENTS (mm) Syntype major of synonymous silvestrii: HW 1.40, HL 1.52, SL 0.60, EL 0.16, PW 0.72. Syntype minor of synonymous silvestrii: HW 0.62, HL 0.64, SL 0.58, EL 0.12, PW 0.42.

COLOR Major: concolorous reddish yellow.

Minor: concolorous plain medium yellow.

Pheidole rosae Wilson 2003.jpg

Figure. Upper: syntype, major of synonymous Pheidole silvestrii Emery (Santa Catarina, Brazil). Lower: syntype, minor of synonymous P. silvestrii Emery (Quebrada Cainzo, Tucumán, Argentina). Scale bars = 1 mm.

Type Material

Brazil: Santa Catarina. Naturhistorisches Museum Wien, Vienna - as reported in Wilson (2003)


Eponymous. (Wilson 2003)


  • Forel, A. 1886b. Espèces nouvelles de fourmis américaines. Ann. Soc. Entomol. Belg. 30:xxxviii-xlix. (page xkii, primary junior homonym of gertrudae)
  • Forel, A. 1901m. Formiciden des Naturhistorischen Museums zu Hamburg. Neue Calyptomyrmex-, Dacryon-, Podomyrma- und Echinopla-Arten. Mitt. Naturhist. Mus. Hambg. 18: 43-82 (page 63, soldier described)
  • Kempf, W. W. 1972. Catálogo abreviado das formigas da região Neotropical. Stud. Entomol. 15: 3–344.
  • Mayr, G. 1887. Südamerikanische Formiciden. Verh. K-K. Zool.-Bot. Ges. Wien 37: 511-632 (page 592, Replacement name for gertrudae)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 742, fig. major, minor described, Senior synonym of silvestrii)