Pheidole acutidens

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Pheidole acutidens
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species group: fallax
Species: P. acutidens
Binomial name
Pheidole acutidens
(Santschi, 1922)

Pheidole acutidens casent0913258 p 1 high.jpg

Pheidole acutidens casent0913258 d 1 high.jpg

Specimen Labels

Pheidole acutidens is a permanent workerless parasite of Pheidole nitidula . The discoverer of this remarkable species, Carlos Bruch (1931), has provided extensive notes on its anatomy, ecology, behavior, and life cycle. (Wilson 2003)

At a Glance • Workerless Inquiline  


See the description in the nomenclature section.

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: -27.484417° to -35.96375°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality), Brazil.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.




Images from AntWeb

Pheidole acutidens casent0913258 p 2 high.jpg
Syntype of Pheidole acutidensQueen (alate/dealate). Specimen code casent0913258. Photographer Z. Lieberman, uploaded by California Academy of Sciences. Owned by NHMB, Basel, Switzerland.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • acutidens. Bruchomyrma acutidens Santschi, 1922d: 249, figs. A-D (q.) ARGENTINA. Bruch, 1931: 31 (m.). Combination in Pheidole: Wilson, 1984: 327. See also: Wheeler, W.M. 1937c: 52; Wilson, 2003: 260.

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


From Wilson (2003): An extreme workerless social parasite of Pheidole nitidula, with adaptations that make it unique within the genus.

Queen: with 9- to 11-segmented antennae and minute, falcate toothless mandibles that taper to needle-sharp points.

Male: pupiform, with mandibles vestigial or absent.

MEASUREMENTS (mm) Syntype queen: HW 0.40, HL 0.42, SL 0.72, EL 0.12, PW 0.58.

COLOR Queen: yellowish brown.

Pheidole acutidens Wilson 2003.jpg

Figure. Queen. Scale bars = 1 mm.

Type Specimen Labels

Type Material

ARGENTINA: La Plata, Buenos Aires, col. Carlos Bruch. Type locality: Alta Gracia (La Granja). Sierra de Córdoba, Argentina. Naturhistorisches Museum, Basel - as reported in Wilson (2003)


L acutidens, sharp-pointed tooth apparently referring to the reduced, acute mandible. (Wilson 2003)


References based on Global Ant Biodiversity Informatics

  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).