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Species: Pheidole polymorpha   Wilson, 2003 

Classification:
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Taxonomic History (provided by Barry Bolton, 2019)

Pheidole polymorpha Wilson, 2003A: 592, figs. (s.w.) MEXICO. AntCat AntWiki HOL

Distribution:

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

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 polymorphaHNS new species

Types Mus. Comp. Zool. Harvard.

etymology Gr polymorphaHNS, many forms, referring to the coexistence of major and supermajor castes.

diagnosis a member of the " piliferaHNS complex" of the larger piliferaHNS group, comprising calensHNS, californicaHNS, carrolliHNS, cavifronsHNS, clementensisHNS, creightoniHNS, hopliticaHNS, littoralisHNS, miculaHNS, piliferaHNS, polymorphaHNS, rugulosaHNS, senexHNS, soritisHNS, tepicanaHNS, and torosaHNS, which complex is distinguished by the following traits. Major: dorsal head surface extensively sculptured; occipital lobes transversely rugulose (or, in carrolliHNS smooth, in littoralisHNS foveate, and in miculaHNS and soritisHNS carinulate); postpetiole from above diamond-shaped, trapezoidal, or spinose. Minor: eye medium-sized to large.

P. polymorphaHNS is distinguished within the complex by the following combination of traits. Worker caste trimorphic, with major, supermajor, and minor.

Major: humerus very pronounced and subtriangular in shape in dorsal-oblique view; propodeal spines stout and vertical to the basal propodeal face; postpetiole from above with sharp right-angular margins; pilosity, long and dense.

Minor: all of mesosoma and almost all of the dorsal head surface foveolate and opaque. Both major and minor: dorsal margin of petiole seen from behind strongly convex.

Measurements (mm) Holotype major: HW 1.34, HL 1.46, SL 0.62, EL 0.20, PW 0.60.

Paratype minor: HW 0.54, HL 0.60, SL 0.56, EL 0.14, PW 0.38.

color Major and minor: brownish yellow.

Range Known only from the type locality and from Chapulco, Puebla, Mexico.

Biology Collected in upland desert. Comment by Stefan Cover (personal communication): "A very interesting beast; it is like P. artemisiaHNS or P. cavigenisHNS on steroids."

Figure Upper: holotype, major; partial head in full-face view of paratype, supermajor. Lower: paratype, minor. MEXICO: Highway 57, km 127, Estado Mexico (Cornell University Field Party, 1965). Scale bars = 1 mm.

Specimen Habitat Summary

Found most commonly in these habitats: 2 times found in xerophyl scrub, 1 times found in agricultural zone.

Found most commonly in these microhabitats: 1 times soil.

Collected most commonly using these methods: 3 times pitfall.

Elevations: collected from 300 - 2050 meters, 1687 meters average

Type specimens:



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