Pheidole torosa

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

Nothing is known about the biology of torosa.


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.

  • torosa. Pheidole torosa Wilson, 2003: 603, 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 A member of the “pilifera complex” of the larger pilifera group, comprising Pheidole calens, Pheidole californica, Pheidole carrolli, Pheidole cavigenis, Pheidole clementensis, Pheidole creightoni, Pheidole hoplitica, Pheidole littoralis, Pheidole micula, Pheidole pilifera, Pheidole polymorpha, Pheidole rugulosa, Pheidole senex, Pheidole soritis, Pheidole tepicana and Pheidole torosa, which complex is distinguished by the following traits. Major: dorsal head surface extensively sculptured; occipital lobe transversely rugulose (or, in carrolli smooth, in littoralis foveate, and in micula and soritis carinulate); postpetiole from above diamond-shaped, trapezoidal, or spinose. Minor: eye medium-sized to large.

P. torosa is distinguished within the complex as follows.

Major: bicolorous; transverse rugulae cover posterior fifth of dorsal surface of head in full-face view, and longitudinal carinulae cover all of the remainder of the dorsal surface except the frontal triangle; humerus in dorsal-oblique view prominent and lobose; in side view, mesonotum drops almost vertically to metanotum; propodeal spines very long, stout, and vertical to propodeal basal face; seen from above, postpetiole very wide relative to petiole, and spinose.

Minor: all of head and mesosoma foveolate and opaque; pilosity along promesonotal dorsum consists of evenly spaced pairs of setae. This species is very close to and possibly synonymous with Pheidole senex.

MEASUREMENTS (mm) Holotype major: HW 1.56, HL 1.84, SL 0.76, EL 0.20, PW 0.68. Paratype minor: HW 0.58, HL 0.64, SL 0.62, EL 0.14, PW 0.32.

COLOR Major: bicolorous, with light reddish brown head and appendages contrasting with dark brown mesosoma and gaster.

Minor: concolorous light brown.

Pheidole torosa Wilson 2003.jpg

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

Type Material

MEXICO: El Sueco, Chihuahua. Museum of Comparative Zoology


L torosa, muscular, bulging, a reference to the major caste.