A nest was found by Longino (1997). beneath the bark of a rotten stump in mature wet forest.
See the description in the nomenclature section.
Keys including this Species
Atlantic slope to 600 m (Longino 1997).
Distribution based on Regional Taxon Lists
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.
- ajax. Pheidole ajax Forel, 1899c: 71 (s.w.) COSTA RICA. See also: Wilson, 2003: 263.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
From Wilson (2003): A large brown member of the fallax group immediately recognizable in the major by the extremely long propodeal spines; by the completely carinulate center of the head and frontal lobes, which is flanked by a rugoreticulum on either side in full-face view; and by the striate first gastral tergite.
Minor: extremely long propodeal spines and mostly smooth and shiny head and body.
MEASUREMENTS (mm) Major (Rio Toro Amarillo, Costa Rica): HW 1.28, HL 1.36, SL 1.16, EL 0.22, PW 0.66.
Minor (Rio Toro Amarillo, Costa Rica): HW 0.56, HL 0.82, SL 1.12, EL 0.14, PW 0.40.
COLOR Major: body dark brown, appendages medium brown.
Minor: body and most appendages medium to light brown, except for yellowish brown tarsi.
Figure. Upper: major. Lower: minor. COSTA RICA: Rio Toro Amarillo, near Guapiles, col. William L. Brown. Minor compared with syntype in Museum d’Histoire Naturelle, Genève, by W. O. Brown. Scale bars = 1 mm.
San José, Costa Rica. Musee d'Histoire Naturelle Genève - as reported in Wilson (2003)
Gr Ajax, legendary Greek hero of the Trojan war. (Wilson 2003)
- Forel, A. 1899e. Formicidae. [part]. Biol. Cent.-Am. Hym. 3: 57-80 (page 71, soldier, worker described)
- Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 263, fig. major, minor described)