Pheidole onyx

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

Pheidole onyx inbiocri002281490 p 1 high.jpg

Specimen Label

Nests under epiphytes in the canopy of natural wet forest (Longino 1997).


See the description in the nomenclature section.

Keys including this Species


Atlantic lowlands of Costa Rica (Longino 1997).

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (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.

  • onyx. Pheidole onyx Wilson, 2003: 479, figs. (s.w.) COSTA RICA.

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


DIAGNOSIS A medium-sized, yellow member of the flavens group whose major is distinguished by slightly backward curving propodeal spines, especially in dorsal-oblique view; all of the dorsal surface of the head up to the occipital border, and not including the mid-clypeus and frontal triangle, covered by longitudinal carinulae; and pronotal humerus subangulate.

Major and minor: scapes exceptionally long for a flavens-group species, placing onyx intermediate to the punctatissima group. Similar to citrina, but the major of onyx has a less curved propodeal spine, far more carinulation on the dorsal head surface, and shorter scapes, among other differences. See also the less similar grex and humida.

MEASUREMENTS (mm) Holotype major: HW 0.80, HL 0.74, SL 0.58, EL 0.10, PW 0.38. Paratype minor: HW 0.46, HL 0.52, SL 0.54, EL 0.06, PW 0.30.

COLOR Major and minor: concolorous medium yellow.

Pheidole onyx Wilson 2003.jpg

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

Type Material

COSTA RICA: La Selva Biological Station, near Puerto Viejo, Heredia, col. J. T. Longino. Instituto Nacional de Biodiversidad


Gr onyx, a yellowish gem stone, alluding to the color of the workers.


  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Cambridge, Mass.: Harvard University Press, [ix] + 794 pp.: 794pp (page 479, fig. major, minor described)