Pheidole ambigua

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

Nothing is known about the biology of ambigua.


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: Brazil (type locality).

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.

  • ambigua. Pheidole ambigua Wilson, 2003: 652, figs. (s.w.) BRAZIL.

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


DIAGNOSIS A medium-sized member of the tristis group, similar to Pheidole amata, Pheidole celaena, Pheidole fera, Pheidole germaini, Pheidole peruviana, Pheidole rutilana, Pheidole schwarzmaieri, Pheidole vomer, and possibly the same as Pheidole bruchi of Argentina, on the basis of resemblance of the minor (major syntypes of bruchi could not be located in the Forel collection at the time of study). The paratype minor of ambigua differs from a syntype minor of bruchi in its more abundant pilosity, lighter color, and foveolate promesonotal dorsum. Otherwise, ambigua is distinguished within the tristis group by the following combination of traits.

Major: anterior two-thirds of dorsum of head carinulate, remainder smooth and shiny; carinulae on rest of body limited to anterior strip of pro notal dorsum; humerus in dorsal-oblique view moderately prominent and lobose; postpetiole from above diamond-shaped.

Minor: pilosity sparse; propodeal spines reduced to dentic1es; promesonotal profile in dorsal-oblique view smoothly convex; occiput narrowed, with a nuchal collar.

MEASUREMENTS (mm) Holotype major: HW 1.54, HL 1.74, SL 0.78, EL 0.18, PW 0.72. Paratype minor: HW 0.56, HL 0.62, SL 0.74, EL 0.40, PW 0.36.

COLOR Major: light reddish yellow. Minor: body light yellowish brown, appendages yellow.

Pheidole ambigua Wilson 2003.jpg

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

Type Material

BRAZIL: Caraguatatuba Reserva Florestal, Sao Paulo, col. William L. and Doris E. Brown. Museum of Comparative Zoology


L ambigua, uncertain, doubtful.