Current View: All Antweb
Change View
Cite this page

Citing AntWeb


To cite this page, please use the following:

· For print: . Accessed

· For web:

Species: Pheidole onyx   Wilson, 2003 

Download Data

Taxonomic History (provided by Barry Bolton, 2019)

Pheidole onyx Wilson, 2003A: 479, figs. (s.w.) COSTA RICA. Neotropic. AntCat AntWiki HOL


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Costa Rica
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Costa Rica, Ecuador


Natural History:

Arboreal in mature wet forest; nests under epiphytes.


A set of BOLD specimens from Ecuador cluster with Costa Rican P. onyx.

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press

Pheidole onyxHNS new species

Types LNBio.

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

Diagnosis A medium-sized, yellow member of the flavensHNS 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 flavens-group species, placing onyxHNS intermediate to the punctatissimaHNS group.

Similar to citrinaHNS, but the major of onyxHNS 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 grexHNS and humidaHNS.

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.

Range Atlantic lowlands of Costa Rica (Longino 1997).

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

Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: La Selva Biological Station, near Puerto Viejo, Heredia (J. T. Longino). Scale bars = 1 mm.

Specimen Habitat Summary

Found most commonly in these habitats: 1 times found in Virola koschnyi, 4 times found in SSO 350m, 2 times found in SURA 850M, 1 times found in wet forest, 4 times found in montane wet forest, 3 times found in wet forest canopy, 2 times found in CCL 400M, 1 times found in Pentaclethra, 1 times found in Sura, 1 times found in CC 1500 m., ...

Found most commonly in these microhabitats: 1 times nest under epiphytes, 1 times Walked up the Surá from the bridge just past the arboretum to LOC. Collected und, 1 times forest near lab clearing, treefall gap, fallen trees leafless, branches dead, bu, 2 times epiphytic material, Pentaclethra macroloba, 1 times One of the ALAS fogging samples, from Carapa guianensis crown., 1 times Muestra tomada entre M/15 y M/17, 1 times Muestra tomada cerca de M/14 en el transecto., 1 times Muestra tomada alrrededor de M/20, 1 times epiphytic material, Virola koschnyi, 1 times copa de árbol, 1 times Camino toma de Agua, ...

Collected most commonly using these methods: 14 times Fogging, 8 times Berlese, 1 times flight intercept trap.

Elevations: collected from 50 - 300 meters, 72 meters average

Type specimens: holotype major Pheidole onyx: inbiocri001218173; paratype Pheidole onyx: inbiocri001218158, inbiocri001225681, inbiocri001226144, inbiocri001238266, inbiocri001267802, inbiocri001268036, inbiocri001270047, inbiocri001270048

See something amiss? Send us an email.