Pheidole perpusilla

This species occurs in wet climate areas, from sea level to 1200m elevation. In mature forest areas it is a common species under epiphytes in the canopy, although its minute size makes it easy to overlook. It also occurs on trees in synanthropic habitats such as coffee farms and city parks. (Longino 2009)

Identification
See the description in the nomenclature section.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil, Colombia, Costa Rica, Guatemala, Guyana, Mexico, Panama, Trinidad and Tobago.

Nomenclature

 *  perpusilla. Pheidole flavens subsp. perpusilla Emery, 1894c: 157 (s.w.q.) BRAZIL. Combination in P. (Decapheidole): Forel, 1912f: 237. Raised to species: Emery, 1896g: 80. Senior synonym of decem, emersoni: Wilson, 2003: 553; of breviscapa: Longino, 2009: 61..
 * breviscapa. Pheidole flavens var. breviscapa Forel, 1899c: 77 (s.) GUATEMALA. Raised to species: Wilson, 2003: 383. Junior synonym of perpusilla: Longino, 2009: 61.
 * decem. Pheidole decem Forel, 1901e: 366 (s.) TRINIDAD. Combination in P. (Decapheidole): Forel, 1912f: 237. Junior synonym of perpusilla: Wilson, 2003: 553.
 * emersoni. Pheidole (Hendecapheidole) emersoni Wheeler, W.M. 1922d: 4, fig. 2 (w.q.m.) GUYANA. Junior synonym of perpusilla: Wilson, 2003: 553.

Description
From Wilson (2003): DIAGNOSIS A member of the perpusilla group (10-segmented antenna, very small body size), distinguished within the group by the following traits.

Major: dorsum of head except for frontal triangle and mid-clypeus completely covered by longitudinal carinulae; propodeal spines short and stout, less than a third as long as the basal propodeal face anterior to them; first gastral tergite and dorsum of postpetiolar node smooth and shiny; pronotum varies from foveolate (South America) to smooth (Panama).

Minor: all of head and mesosoma foveolate and opaque.

MEASUREMENTS (mm) Major (Mazaruni, Guyana): HW 0.60, HL 0.62, SL 0.26, EL 0.06, PW 0.32. Minor (syntype of synonymous emersoni): HW 0.34, HL 0.38, SL 0.28, EL 0.06, PW 0.26.

COLOR Major: most of body and appendages reddish yellow, gaster medium to dark brown.

Minor: body yellowish brown, appendages in contrasting yellow.



'''Figure. Upper: major, composite of specimens from Mazaruni, Guyana, and Barro Colorado Island, Panama (latter specimen compared with syntype in Emery collection by W. L. Brown). Lower: minor, Barro Colorado Island, Panama. Scale bars = 1 mm.'''

Type Material
Longino (2009):

Syntype major, minor worker, gyne: Brazil, Pará (Schulz).

Pheidole flavens var. breviscapa Holotype major worker: Guatemala, Retalhuleu (Stoll) (examined).

Pheidole decem Forel, 1901a: 366. Syntype major worker: Trinidad.

Pheidole (Hendecapheidole) emersoni. Syntype minor worker, gyne, male: Guyana, Kartabo (Emerson).

Etymology
L perpusilla, extremely small. (Wilson 2003)