Pheidole horribilis

AntWiki: The Ants --- Online
Jump to navigation Jump to search
Pheidole horribilis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. horribilis
Binomial name
Pheidole horribilis
Wilson, 2003

From Wilson (2003): At Cuzco Amazónico, Peru, minor workers were found foraging on the ground and on top of a log in rainforest; one was carrying a termite worker, col. Stefan Cover and John E. Tobin. Winged queens were present in a nest at Yasuni National Park, Ecuador, in April, col. S. O’Donnell.


See the description in the nomenclature section.

Keys including this Species


Known from the type colony as well as series collected at Yasuni National Park, Puerto Tiputini, Ecuador; and Cuzco Amazónico, near Puerto Maldonado, Madre de Dios, Peru. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Ecuador (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 Online Catalogue of the Ants of the World.

  • horribilis. Pheidole horribilis Wilson, 2003: 708, figs. (s.w.) ECUADOR.

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


DIAGNOSIS Similar to Pheidole minax, Pheidole terribilis, Pheidole ursus, and species around Pheidole macromischoides, differing as follows.

Major: propodeal spines stout, over half as long as basal propodeal face anterior to them; posterior half of dorsal head surface carinulate and anterior half, including frontal lobes, mostly rugoreticulate; entire promesonotum rugoreticulate; anterior half of central strip of first gastral tergite shagreened; pilosity dense, erect to suberect, and long, most hairs as long as Eye Length or longer.

Minor: propodeal spine as long as propodeal basal face; promesonotum and mesopleuron almost entirely rugoreticulate; occiput narrow, with nuchal crest, rugulose and not rugoreticulate; anterior half of central strip shagreened.

MEASUREMENTS (mm) Holotype major: HW 1.88, HL 1.90, SL 0.84, EL 0.20, PW 0.94. Paratype minor: HW 0.80, HL 0.80, SL 0.86, EL 0.14, PW 0.56.

COLOR Major: head and mesosoma rich medium reddish brown; waist, gaster, and appendages yellowish brown.

Minor: body reddish yellow except for gaster, which is plain medium brown.

Pheidole horribilis Wilson 2003.jpg

Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

ECUADOR: Jatun Sacha Biological Station, Misahuali, col. Peter Frumhoff. Museum of Comparative Zoology


L horribilis, dreadful, bristly, rough.


References based on Global Ant Biodiversity Informatics

  • Bezdeckova K., P. Bedecka, and I. Machar. 2015. A checklist of the ants (Hymenoptera: Formicidae) of Peru. Zootaxa 4020 (1): 101–133.
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Ryder Wilkie K. T., A L. Mertl, J. F. A. Traniello. 2010. Diversity of ground-dwelling ants (Hymenoptera: Formicidae) in primary and secondary forests in Amazonian Ecuador. Myrmecological News(12): 139-147