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Species: Pheidole unicornis   Wilson, 2003 

Classification:
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Taxonomic History (provided by Barry Bolton, 2018)

Pheidole unicornis Wilson, 2003A: 772, figs. (s.w.) COLOMBIA. Neotropic. AntCat AntWiki HOL

Taxonomic history

Scupola, 2012 PDF: 206 (q.m.).

Distribution:

  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Colombia, Ecuador
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Neotropical

Distribution Notes:

Colombia, Ecuador.

Identification:

Differing from P. rhinoceros as follows:

Minor worker: sparse oblique striae on side of head behind eye, versus smooth and shining. Major worker: scrobal region of face with longitudinal striations versus with faint concentric arching striations.

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 unicornisHNS new species

TYPES Mus. Comp. Zool. Harvard.

Etymology L unicornisHNS, one-horned, referring to the raised clypeal carina.

diagnosis Similar to binasiferHNS, diabolusHNS, gravidaHNS, mirabilisHNS, moseniHNS, mosenopsisHNS, nasiferHNS, and rhinocerosHNS, and distinguished as follows.

Major: median carina of clypeus raised as a low, forward-projecting lobe; humerus in dorsal-oblique view a low lobe; mesonotal convexity suppressed; propodeal spines vertical on propodeal basal face, and in dorsal-oblique view curve slightly forward; dorsum of propodeum and anterior and lateral margins of pronotal dorsum carinulate; petiolar node in side view symmetrically rounded; postpetiole from above diamond-shaped.

Minor: occiput broad, lacking nuchal collar; posterior half of dorsal head surface smooth and shiny, and anterior half covered mostly by circular carinulae; propodeal spines vertical on propodeal dorsal face; postpetiolar node in side view suppressed; mesosomal pilosity consists of relatively short, erect bristles of nearly equal length.

measurements (mm) Holotype major: HW 1.42, HL 1.64, SL 0.72, EL 0.18, PW 0.84.

Paratype minor: HW 0.72, HL 0.78, SL 0.64, EL 0.12, PW 0.46.

color Major: head medium reddish brown, mandibles and body dark reddish brown; other appendages light reddish brown. Minor: body medium reddish brown, appendages dark yellow.

range Known from the type locality, as well as Pichinde, also near Cali, at 1600 m; and near Cochancay, on Guayaquil-Tambo Highway, Canar, Ecuador.

Biology Occurs in mountain forests.

figure Upper: holotype, major. Lower: paratype, minor. COLOMBIA: Television Tower Road, Salidito, near Cali, 2100 m (W. L. Brown and R. B. Root). Scale bars = 1 mm.

Specimen Habitat Summary

Elevations: collected from 2064 - 2100 meters, 2076 meters average

Type specimens: paratype Pheidole unicornis: jtlc000016566; Paratype Pheidole unicornis Wilson 2003: casent0645887, casent0645888



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