Pheidole bajaensis

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

Pheidole bajaensis casent0172964 profile 1.jpg

Pheidole bajaensis casent0172964 dorsal 1.jpg

Specimen labels

Nothing is known about the biology of bajaensis.


See the description in the nomenclature section.

Keys including this Species


Known only from Baja California Sur; possibly a geographic variant of xerophila. (Wilson 2003)

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.

  • bajaensis. Pheidole bajaensis Wilson, 2003: 559, 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 and possibly conspecific with Pheidole yaqui, differing as follows.

Major: occiput rugulose from the midline partly out to the occipital corners; postpetiole laterally subangulate seen from above; margins of anterior half of pronotum not transversely carinulate.

Minor: humerus in dorsal-oblique view less angulate and occipital lobes in full-face view more so, and propodeal spines longer. Together, bajaensis and yaqui differ from gilvescens and xerophila in the major’s head shape, which in side view is rounded (not flattened) in the dorsal profile of its posterior half, and the failure of the head to taper toward the occiput; other traits exist in major and minor as shown. Philip Ward (personal communication) has pointed out that yaqui and bajaensis are joined by intermediates in the degree of occipital rugulation, forming what appears to be a southward cline on Baja. He recommends treating the two forms as one species. Ward may be right, but I have hesitated to unite the two forms in view of the presence of other defining traits described here in the Diagnosis.

MEASUREMENTS (mm) Holotype major: HW 1.22, HL 1.26, SL 0.64, EL 0.24, PW 0.52. Paratype minor: HW 0.54, HL 0.60, SL 0.52, EL 0.20, PW 0.32.

COLOR Major: body and appendages medium yellow except mandibles, which are dark yellow.

Minor: body and appendages medium yellow.

Pheidole bajaensis Wilson 2003.jpg

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

Holotype Specimen Labels

Type Material

BAJA CALIFORNIA SUR, MEXICO: 50 km south-southwest of San Ignacio, 26°52'N 113°08'W, col. Philip S. Ward. Museum of Comparative Zoology


L bajaensis, named after the Mexican state of origin.