Pheidole trachyderma

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

Pheidole trachyderma casent0904374 p 1 high.jpg

Pheidole trachyderma casent0904374 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of trachyderma.


See the description in the nomenclature section.

Keys including this Species


Only known from the type locality.

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb






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

  • trachyderma. Pheidole risi subsp. trachyderma Emery, 1906c: 148 (s.w.q.) ARGENTINA. [Misspelled as pachyderma by Santschi, 1912e: 529.] Raised to species: Wilson, 2003: 765.

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 traits to Pheidole aper, Pheidole bambusarum, Pheidole brevicona, Pheidole dyctiota, Pheidole laeviventris, Pheidole lutzi, Pheidole rugatula, Pheidole senilis, Pheidole sigillata and Pheidole traini, distinguished as follows.

Major: reddish yellow; all of dorsal surface of head (including frontal lobes) rugoreticulate, except for occiput, antennal fossae, frontal triangle, and clypeus; margins of pronotal dorsum rugulose and humeri rugoreticulate, but rest of promesonotal dorsum almost exclusively foveolate; in side view promesonotum descends to metanotal groove in a near-vertical face; postpetiole from above cone-shaped.

Minor: all of head, mesosoma, and petiole foveolate and opaque, carinulae confined to anterior dorsal surface of head, and rugoreticula wholly lacking; occiput broad, lacking nuchal collar.

MEASUREMENTS (mm) Lectotype major: HW 1.18, HL 1.18, SL 0.64, EL 0.14, PW 0.66. Paralectotype minor: HW 0.58, HL 0.62, SL 0.58, EL 0.10, PW 0.40.

COLOR Major: concolorous medium reddish yellow.

Minor: concolorous light reddish yellow.

Pheidole trachyderma Wilson 2003.jpg

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

Lectotype Specimen Labels

Type Material

ARGENTINA: San Pedro, Misiones. Museo Civico di Storia Naturale, Genoa - as reported in Wilson (2003)


Gr trachyderma, rough skin, alluding to rugoreticulate sculpturing. (Wilson 2003)


  • Emery, C. 1906c [1905]. Studi sulle formiche della fauna neotropica. XXVI. Bull. Soc. Entomol. Ital. 37: 107-194 (page 148, soldier, worker, queen described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 765, fig. major, minor described, Raised to species: new status)