Pheidole viriosa

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

This species is only known from the type specimens, which were sifted from litter on the floor of rainforest.


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: Ecuador (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • viriosa. Pheidole viriosa Wilson, 2003: 534, figs. (s.w.) ECUADOR.

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


DIAGNOSIS Similar in various traits to Pheidole angulifera, Pheidole dimidiata, Pheidole erratilis, Pheidole gilva, Pheidole schmalzi and Pheidole tambopatae, differing as follows.

Major: head bicolored as illustrated; median ocellus present; humerus in dorsal-oblique view bearing a right-angular extension; occipital cleft very broad and moderately deep; propodeal spines directed strongly backward; postpetiole very narrow and oval from above; rear quarter of dorsal head surface smooth and shiny.

Minor: occiput somewhat narrowed, its margin weakly convex, and lacking nuchal collar; propodeal spines directed strongly backward; head almost completely smooth and shiny, with only a few faint carinulae at the antennal fossae; pilosity long, some hairs longer than Eye Length.

MEASUREMENTS (mm) Holotype major: HW 0.74, HL 0.80, SL 0.42, EL 0.10, PW 0.36. Paratype minor: HW 0.42, HL 0.46, SL 0.40, EL 0.12, PW 0.30.

COLOR Major: head bicolored, with vertex and frontal triangle medium brown and rest of head brownish yellow; tarsi brownish yellow; rest of body and appendages light brown.

Minor: head and gaster dark brown, tarsi brownish yellow, rest of body and appendages medium brown.

Pheidole viriosa Wilson 2003.jpg

Figure. Upper: holotype, major, with hind femur included. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

ECUADOR: Jatun Sacha, 7 km east-southeast of Puerto Misahualli, Napo, 1°04'S 37°37'W, col. Philip S. Ward. Museum of Comparative Zoology


L viriosa, robust, strong.


References based on Global Ant Biodiversity Informatics

  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.