Current View: All Antweb
Change View
Cite this page

Citing AntWeb


To cite this page, please use the following:

· For print:      Citation: AntWeb. Version 8.86.1. California Academy of Science, online at Accessed .

· For web:

Species: Pheidole embolopyx   Brown, 1968 

Download Data

Current Valid Name:

Taxonomic History (provided by Barry Bolton, 2023)

Pheidole embolopyx Brown, 1968b PDF: 332, figs. 1-7 (s.w.q.) BRAZIL (Amazonas). Neotropic. Primary type information: Primary type material: holotype major worker. Primary type locality: Brazil: Amazonas, Igarapé Marianil (ca 24 km. NE Manaus), nr km. 5 on Rio Branco Road, 26.viii.1962, M-77 (W.L. Brown). Primary type depository: MCZC. Secondary type information: Secondary type material: paratype major workers, paratype minor workers (numbers not stated), 1 paratype queen. Secondary type locality: Amazonas, vic. Igarapé Marianil, nr km. 50 Amazonas Ruta 1, 24.viii.1962, M-60 (W.L. Brown). Secondary type depositories: CUIC, MCZC, MZSP. AntCat AntWiki HOL

Taxonomic history

Status as species: Kempf, 1972b PDF: 190; Bolton, 1995b: 321; Wilson, 2003a: 189 (redescription); Bezděčková et al., 2015 PDF: 119.
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Brazil, Ecuador, French Guiana, Peru
  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

Pheidole embolopyx BrownHNS

Pheidole embolopyx BrownHNS 1968b: 332.

Types Mus. Comp. Zool. Harvard.

Etymology Gr embolopyxHNS, stopper box, referring to the truncate abdomen of the queen.

Diagnosis A unique species of PheidoleHNS, distinguished in the queen by the posteriorly flattened gastral tergites, hence truncated shape of the gaster overall, and the flattened rear surface covered by peculiar short, hooked hairs.

Major: head bicolored with broad dark yellow to light reddish brown arcs over most of the dorsal surface and on the genae and the rest medium brown, as depicted; tip of antennal scape touching head margin two-thirds from level of eye to level of occiput; most of dorsal surface of head foveolate; anterior half of pronotal dorsum transversely carinulate; anterior half of central strip of first gastral tergite shagreened; propodeal spines thick, triangular; postpetiole from above oval.

Minor: head narrowed, with nuchal collar; propodeal spines reduced; margins of pronotal dorsum foveolate; anterior fourth of central strip of first gastral tergite shagreened.

Measurements (mm) Paratype major: HW 0.94, HL 1.00, SL 0.74, EL 0.14, PW 0.44. Paratype minor: HW 0.44, HL 0.56, SL 0.72, EL 0.12, PW 0.32.

color Major: head bicolored, as described in Diagnosis above; body light to dark yellow; appendages light brown to brownish yellow. Minor: concolorous light brown, appendages dark yellow.

Figure Upper: paratype, major. Lower: paratype, minor. BRAZIL: lg. Marianil, Rio Branco Rd., 24 km northeast of Manaus. A figure of a paratype queen is also shown (from Brown 1968b). Scale bars = 1 mm.

Range In addition to two localities around Manaus, embolopyxHNS has been recorded from Diamantino, Mato Grosso; from near Puerto Maldonado, Madre de Dios, Peru; and Yasuni National Park in Ecuador.

Biology P. embolopyxHNS inhabits rainforest, nesting in pieces of rotting wood buried in litter. Mature colonies contain up to several hundred workers and a single nest queen. Winged queens have been found in March near Manaus. The queens do not use their truncated abdomens to block galleries and nest entrances, as expected (Wilson and Holldobler 1985). Instead, it is likely that they assume a turtle-like crouching position when threatened, bringing into play the truncated abdomen, flanges on the pronotum, and gelatinous secretions on the front of the head. Wilson and Holldobler also report the origin of an odor-trail pheromone in the poison gland and an alarm pheromone in the pygidial gland.

Specimen Habitat Summary

Found most commonly in these habitats: 2 times found in TerraFirme.

Found most commonly in these microhabitats: 2 times LeafLitter.

Collected most commonly using these methods: 2 times Winkler48h.

Elevations: collected from 336 - 529 meters, 400 meters average

Collect Date Range: collected between 2009-01-01 00:00:00.0 and 2015-03-04 00:00:00.0

Type specimens:

See something amiss? Send us an email.
Log In to see maps.