Pheidole psilogaster , Wilson, E. O., 2003

Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press, pp. -1--1: 341

publication ID


persistent identifier

treatment provided by


scientific name

Pheidole psilogaster

new species

Pheidole psilogaster  HNS  new species

Types Mus. Comp. Zool. Harvard.

Etymology Gr psilogaster, bare stomach (gaster of ant).

diagnosis A member of the fallax  HNS  group, very similar to potosiana  HNS  and less so to the other species listed in the heading above. Major: first gastral tergite covered with short recumbent hairs of even length, and anterior half also by a dense layer of short subrecumbent hairs all of approximately the same length; gastral sternites covered by dense subrecumbent hairs all of which are the same medium length; head and body concolorous light reddish brown; mesopleuron with broken short rugulae; rugoreticulum on head stretches on each side from eye to antennal fossa; carinulae extend posteriorly to eye only a little more than 2X Eye Length, except for those adjacent to midline, which travel from vertex to occiput; humerus in dorsal-oblique view subangulate. Minor: occiput narrowed with nuchal collar; humerus in dorsal-oblique view denticulate; propodeal spines thin and vertical to basal propodeal space; mesopleuron carinulate.

Measurements (mm) Holotype major: HW 0.94, HL 1.00, SL 0.82, EL 0.16, PW 0.52. Paratype minor: HW 0.58, HL 0.70, SL 0.90, EL 0.12, PW 0.38. color Major: concolorous light reddish brown.

Minor: body concolorous plain medium brown; appendages light to yellowish brown except for tarsi, which are yellow.

Range Known from the type locality, as well as from the Kukra River, Nicaragua (Ivette Perfecto).

biology The type colony was collected from sifted litter, leaf mold, and rotting wood in a rainforest.

Figure Upper: holotype, major. Lower: paratype, minor (tentatively associated). MEXICO: Los Tuxtlas,

10 km north-northwest of Sontecomapan, Veracruz, 18°35TN" 95°05W, 500 m (Philip S. Ward). Scale bars = 1 mm.