Pheidole arctos

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Pheidole arctos
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. arctos
Binomial name
Pheidole arctos
Wilson, 2003

Nothing is known about the biology of arctos.


See the description in the nomenclature section.

Keys including this Species


Only known from the type locality.

Distribution based on Regional Taxon Lists

Neotropical Region: Mexico (type locality).

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.

  • arctos. Pheidole arctos Wilson, 2003: 623, figs. (s.w.) MEXICO.

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


DIAGNOSIS Close to Pheidole gangamon, also of Mexico, and probably also to Pheidole epetrion and Pheidole thrasys, but distinguished from these and other members of the scrobifera group by the following combination of traits.

Major: rear one-fourth of dorsal head surface, rear one-half of the lateral head surfaces, and area between the eye and frontal lobes rugoreticulate; anterior half of the frontal lobes carinulate; entire central half of the dorsal head surface foveolate only; all of promesonotal and postpetiolar dorsa carinulate to rugoreticulate; anterior central strip of first gastral tergite longitudinally striate; humerus composing a very large lobe that projects high above the mesonotal convexity; posterior half of dorsal head profile weakly concave.

Minor: the two humeri conulate, the tip of each bearing very long hairs; head and prothorax entirely smooth and shiny.

MEASUREMENTS (mm) Holotype major: HW 1.28, HL 1.60, SL 0.62, EL 0.18, PW 0.82. Paratype minor: HW 0.62, HL 0.64, SL 0.60, EL 0.12, PW 0.42.

COLOR Major and minor: body dark brown, appendages medium brown, tarsi yellow.

Pheidole arctos Wilson 2003.jpg

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

Type Material

MEXICO: Gomez Fariás, Tamaulipas, 400–600 m, col. Cornell University Mexico Field Party, 1964. Museum of Comparative Zoology


Gr arctos, bear, alluding to the large size and rough, shaggy appearance of the major.