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Species: Pheidole piceonigra   Emery, 1922 

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Taxonomic History (provided by Barry Bolton, 2019)

Pheidole piceonigra Emery, 1922c PDF: 109. AntCat AntWiki

Taxonomic history

Replacement name for Pheidole picea Mayr, 1870b PDF: 988.
[Junior secondary homonym of Atta picea Buckley, 1867 PDF: 344.].
See also: Wilson, 2003A: 216.


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

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, pp. -1--1

Pheidole piceonigra EmeryHNS

Types Naturhist. Mus. Wien (unde rpicea Mayr).

Etymology L piceonigraHNS, pitch-black plus black.

Diagnosis Close to indistinctaHNS of Costa Rica, considered by Longino (1997) to belong with it in a single, very variable species. The types, however, are very different, with those of piceonigraHNS distinguished as follows.

Major: piceonigraHNS with much less abundant pilosity than indistinctaHNS; rugoreticulation between eye and antennal fossa; color much darker (see Color below), and head concolorous, not bicolorous as in indistinctaHNS; posterior side of head with bands of foveolae; humerus in dorsal-oblique view rounded; apex of postpetiole in side view more rounded.

Minor: occiput and posterior sides of head foveolate, not smooth as in indistinctaHNS; much less pilose than indistinctaHNS; color much lighter.

If continuous intergrades are demonstrated between the two forms, they may be joined; otherwise it is more prudent to distinguish them as species.

Measurements (mm) Lectotype major: HW 1.06, HL 1.04, SL 0.76, EL 0.20, PW 0.54. Paralectotype minor: HW 0.62, HL 0.70, SL 0.80, EL 0.14, PW 0.40. Color Major: body dark brown, gaster almost black.

Minor: head, mesosoma, and waist dark reddish brown; propodeum and gaster blackish brown; appendages medium brown.

Range I have seen series from Chiapas, Tamaulipas, and Veracruz in Mexico, at 1070-2200 m, and from Costa Rica. On the basis of the types, I am considering this species as different from indistinctaHNS, which also occurs in Costa Rica.

Biology Longino's notes (1997) on the distribution and natural history of " indistinctaHNS " may apply to that species, to piceonigraHNS, or to both. I found a large, undoubted piceonigraHNS colony nesting at the base of an ornamental shrub in a much disturbed San Jose city park. In Tamaulipas, the Cornell University Mexico Field Party of 1965 encountered it at 1070 m in tall cloud forest.

Figure Upper: lectotype, major. Lower: paralectotype, minor. MEXICO (no further data). Scale bars = 1 mm.

Specimen Habitat Summary

Type specimens: Lectotype Pheidole piceonigra: casent0601283; Paralectotype Pheidole piceonigra: casent0601284

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