Pheidole nigella

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Pheidole nigella
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. nigella
Binomial name
Pheidole nigella
Emery, 1894

Pheidole nigella casent0904379 p 1 high.jpg

Pheidole nigella casent0904379 d 1 high.jpg

Specimen Labels


Nothing is known about the biology of nigella.


See the description in the nomenclature section.

Keys including this Species


Known from Bolivia and Peru. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Bolivia (type locality), Peru.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb







The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • dimidiata. Pheidole dimidiata Emery, 1894c: 160 (s.w.) BOLIVIA. Junior synonym of nigella: Wilson, 2003: 728.
  • nigella. Pheidole fabricator var. nigella Emery, 1894c: 155 (s.w.) BOLIVIA. Raised to species and senior synonym of dimidiata: Wilson, 2003: 728.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


From Wilson (2003): DIAGNOSIS A member of the tristis group similar to Pheidole balzani, Pheidole fabricator and Pheidole tristis, and distinguished from these and other species in the group by the following traits.

Major: small and dark; occiput with very broad, moderately deep median occipital concavity in full-face view; humerus in dorsaloblique view a low, smooth convexity that runs almost indistinguishably into the mesothorax; mesothoracic convexity extremely reduced, barely visible; postpetiolar node oval; weak longitudinal carinulae cover sides of pro no tum.

Minor: humerus with low blunt denticle in dorsal-oblique view; pronotum and mesonotum indistinguishable in a single profile; mesonotal convexity absent.

MEASUREMENTS (mm) Major (nigella lectotype): HW 1.06, HL 1.10, SL 0.60, EL 0.14, PW 0.50. Minor: HW 0.54, HL 0.60, SL 0.54, EL 0.10, PW 0.38.

COLOR Major and minor: body concolorous medium brown, appendages brownish yellow.

Pheidole nigella Wilson 2003.jpg

Figure. Upper: major (syntype of synonymous P. dimidiata Emery). Lower: minor (syntype of synonymous P. dimidiata Emery). BOLIVIA: Salinas, Rio Beni, Bolivia; Luigi Balzan. Scale bars = 1 mm.

Lectotype Specimen Labels

Type Material

Salinas, Rio Beni, Bolivia, col. Luigi Balzan. Museo Civico di Storia Naturale, Genoa - as reported in Wilson (2003)


L nigella, little dark one. (Wilson 2003)


  • Emery, C. 1894d. Studi sulle formiche della fauna neotropica. VI-XVI. Bull. Soc. Entomol. Ital. 26: 137-241 (page 155, soldier, worker described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Cambridge, Mass.: Harvard University Press, [ix] + 794 pp.: 794pp (page 728, fig. major, minor describe, Raised to species: new status, Senior synonym of dimidiata)