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Costa Rica, Ecuador
Arboreal in mature wet forest; nests under epiphytes.
A set of BOLD specimens from Ecuador cluster with Costa Rican P. onyx.
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.
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.
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 Sura, 1 times found in CC 1500 m., 1 times found in CES 400, ...
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