Pheidole gertrudae

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Pheidole gertrudae
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species group: gertrudae
Species: P. gertrudae
Binomial name
Pheidole gertrudae
Forel, 1886

Pheidole gertrudae casent0178028 profile 1.jpg

Pheidole gertrudae casent0178028 dorsal 1.jpg

Specimen labels


Nothing is known about the biology of gertrudae.


See the description in the nomenclature section.

Keys including this Species


Widespread in Brazil, from Amazonas to Santa Catarina; also recorded from Tipuani, La Paz, Amazonian Bolivia (var. leonhardi types); Canindeyli Department, Paraguay; and Loreto, Misiones, northern Argentina (var. loretensis types). (Wilson 2003)

Latitudinal Distribution Pattern

Latitudinal Range: 25.68015° to -27.331°.

Tropical South

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.





Images from AntWeb

Pheidole gertrudae casent0178029 head 1.jpgPheidole gertrudae casent0178029 profile 1.jpgPheidole gertrudae casent0178029 dorsal 1.jpgPheidole gertrudae casent0178029 label 1.jpg
Worker. Specimen code casent0178029. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by ALWC, Alex L. Wild Collection.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • gertrudae. Pheidole gertrudae Forel, 1886b: xlii (w.) BRAZIL. Mayr, 1887: 592 (s.). Senior synonym of humilis: Kempf, 1960f: 463; of leonhardi, loretensis: Wilson, 2003: 537.
  • leonhardi. Pheidole gertrudae var. leonhardi Forel, 1901h: 62 (s.w.) BOLIVIA. Junior synonym of gertrudae: Wilson, 2003: 537.
  • humilis. Megalomyrmex (Wheelerimyrmex) humilis Borgmeier, 1930: 35, pl. 5, figs. 34, 36 (w.) BRAZIL. Junior synonym of gertrudae: Kempf, 1960f: 463.
  • loretensis. Pheidole (Pheidole) gertrudae var. loretensis Santschi, 1933e: 108 (w.) ARGENTINA. Junior synonym of gertrudae: Wilson, 2003: 537.

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 With the distinctive qualities of the gertrudae group: propodeal spines greatly reduced to absent in major, absent in minor; propodeal spiracle extremely large; entire body mostly smooth and shiny. Differs from other members of group (Pheidole capillata, Pheidole jeannei, q.v.) in the major in the following combination of traits: no rugoreticulum on head, humerus subangulate in dorsal-oblique view; no trace of a propodeal spine, with the basal and declivitous faces of the propodeum in side view meeting in a very wide oblique angle.

MEASUREMENTS (mm) Lectotype major: HW 1.30, HL 1.34, SL 0.76, EL 0.26, PW 0.62. Para lectotype type minor: HW 0.64, HL 0.66, SL 0.72, EL 0.14, PW 0.40.

COLOR Major: concolorous light reddish yellow.

Minor: concolorous light brownish yellow.

Pheidole gertrudae Wilson 2003.jpg

Figure. Upper: lectotype, major. Lower: paralectotype, minor. Scale bars = 1 mm.

Type Material

BRAZIL: Guanabara, Rio de Janeiro. Musee d'Histoire Naturelle Genève - as reported in Wilson (2003)


Named in honor of Gertrude Naegeli. (Wilson 2003)


References based on Global Ant Biodiversity Informatics

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  • Forel A. 1908. Ameisen aus Sao Paulo (Brasilien), Paraguay etc. gesammelt von Prof. Herm. v. Ihering, Dr. Lutz, Dr. Fiebrig, etc. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 58: 340-418.
  • Forel A. 1912. Formicides néotropiques. Part III. 3me sous-famille Myrmicinae (suite). Genres Cremastogaster et Pheidole. Mémoires de la Société Entomologique de Belgique. 19: 211-237.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
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  • Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
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  • Silvestre R., C. R. F. Brandão, and R. R. Silva da 2003. Grupos funcionales de hormigas: el caso de los gremios del cerrado. Pp. 113-148 in: Fernández, F. (ed.) 2003. Introducción a las hormigas de la región Neotropical. Bogotá: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, xxvi + 424 pp.
  • Silvestre R., M. F. Demetrio, and J. H. C. Delabie. 2012. Community Structure of Leaf-Litter Ants in a Neotropical Dry Forest: A Biogeographic Approach to Explain Betadiversity. Psyche doi:10.1155/2012/306925
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