Pheidole grex

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Pheidole grex
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. grex
Binomial name
Pheidole grex
Wilson, 2003

This species is only known from a few collections. Nothing is known about its biology.


See the description in the nomenclature section.

Keys including this Species


Known from Cundinamarca and Meta provinces in Colombia. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (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.

  • grex. Pheidole grex Wilson, 2003: 430, figs. (s.w.) COLOMBIA.

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


A medium-sized, slender, yellow species placed in the flavens group (but with habitus intermediate to the punctithorax group), whose major has completely foveolate dorsum of the head (exclusive of central clypeus and frontal triangle) and mesosoma; carinulae limited to the anterior two-thirds of the head capsule; profile of the posterior half of the head flat in side view; relatively long, slender, nearly erect propodeal spines; low but distinct mesonotal convexity; and low postpetiolar node in side view.

Minor: foveolation as in major; sparse, paired hairs on mesonotal dorsum; and short, erect propodeal spines that curve forward. Somewhat similar to humida, but different in many details, as figured.

MEASUREMENTS (mm) Holotype major: HW 0.94, HL 1.08, SL 0.60, EL 0.16, PW 0.52. Paratype minor: HW 0.54, HL 0.58, SL 0.52, EL 0.10, PW 0.16.

COLOR Major: concolorous dark yellow.

Minor: concolorous medium yellow.

Pheidole grex Wilson 2003.jpg

Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

COLOMBIA: Susumuco, Bogotá-Villavicencio, Cundinamarca, Km 88, 1100 m, col. William L. and Doris E. Brown. Museum of Comparative Zoology


Gr grex, herd or flock.