Pheidole triconstricta

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Pheidole triconstricta
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species group: diligens
Species: P. triconstricta
Binomial name
Pheidole triconstricta
Forel, 1886

Pheidole triconstricta casent0281737 p 1 high.jpg

Pheidole triconstricta casent0281737 d 1 high.jpg

Specimen Labels


From Wilson (2003): Males were present in a nest in San Miguel de Tucumán, Argentina, 18 January – 3 February, col. W. L. Brown.


See the description in the nomenclature section.

Keys including this Species


Besides the types and other specimens from Argentina, I have seen specimens form São Paulo, Brazil, Bolivia (Faquira), and Argentina (San Miguel de Tucumán); Kempf lists triconstricta in addition from Uruguay and Minas Gerais and Paraná in Brazil. (Wilson 2003)

Latitudinal Distribution Pattern

Latitudinal Range: -9.466667° to -34.6°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality), Bolivia, Brazil, Paraguay, Uruguay.

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 triconstricta casent0281738 h 1 high.jpgPheidole triconstricta casent0281738 p 1 high.jpgPheidole triconstricta casent0281738 d 1 high.jpgPheidole triconstricta casent0281738 l 1 high.jpg
Worker. Specimen code casent0281738. Photographer Estella Ortega, uploaded by California Academy of Sciences. Owned by NHMUK, London, UK.
Pheidole triconstricta casent0908125 h 1 high.jpgPheidole triconstricta casent0908125 p 1 high.jpgPheidole triconstricta casent0908125 d 1 high.jpgPheidole triconstricta casent0908125 l 1 high.jpg
Paralectotype of Pheidole triconstrictaWorker. Specimen code casent0908125. Photographer Z. Lieberman, uploaded by California Academy of Sciences. Owned by MHNG, Geneva, Switzerland.
Pheidole triconstricta casent0908127 h 1 high.jpgPheidole triconstricta casent0908127 p 1 high.jpgPheidole triconstricta casent0908127 d 1 high.jpgPheidole triconstricta casent0908127 l 1 high.jpg
Syntype of Pheidole triconstricta rosariensisWorker. Specimen code casent0908127. Photographer Z. Lieberman, uploaded by California Academy of Sciences. Owned by MHNG, Geneva, Switzerland.


Images from AntWeb

Pheidole triconstricta casent0904323 h 1 high.jpgPheidole triconstricta casent0904323 p 1 high.jpgPheidole triconstricta casent0904323 d 1 high.jpgPheidole triconstricta casent0904323 l 1 high.jpg
Syntype of Pheidole triconstricta ambulansWorker (major/soldier). Specimen code casent0904323. Photographer Z. Lieberman, uploaded by California Academy of Sciences. Owned by MSNG, Genoa, Italy.
Pheidole triconstricta casent0908108 h 1 high.jpgPheidole triconstricta casent0908108 p 1 high.jpgPheidole triconstricta casent0908108 d 1 high.jpgPheidole triconstricta casent0908108 l 1 high.jpg
Syntype of Pheidole radoszkowskii saviozaeWorker (major/soldier). Specimen code casent0908108. Photographer Will Ericson, uploaded by California Academy of Sciences. Owned by MHNG, Geneva, Switzerland.
Pheidole triconstricta casent0908109 h 1 high.jpgPheidole triconstricta casent0908109 p 1 high.jpgPheidole triconstricta casent0908109 d 1 high.jpgPheidole triconstricta casent0908109 l 1 high.jpg
Syntype of Pheidole radoszkowskii discursansWorker (major/soldier). Specimen code casent0908109. Photographer Will Ericson, uploaded by California Academy of Sciences. Owned by MHNG, Geneva, Switzerland.
Pheidole triconstricta casent0908124 h 1 high.jpgPheidole triconstricta casent0908124 p 1 high.jpgPheidole triconstricta casent0908124 d 1 high.jpgPheidole triconstricta casent0908124 l 1 high.jpg
Lectotype of Pheidole triconstrictaWorker (major/soldier). Specimen code casent0908124. Photographer Z. Lieberman, uploaded by California Academy of Sciences. Owned by MHNG, Geneva, Switzerland.


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

  • triconstricta. Pheidole triconstricta Forel, 1886b: xlv (s.) ARGENTINA. Emery, 1906c: 152 (q.). Senior synonym of ambulans, discursans, hebe, rosariensis, saviozae: Wilson, 2003: 241.
  • ambulans. Pheidole triconstricta var. ambulans Emery, 1906c: 153 (s.w.) ARGENTINA. Forel, 1913l: 230 (m.); Santschi, 1919f: 40 (q.). Junior synonym of triconstricta: Wilson, 2003: 241.
  • saviozae. Pheidole radoszkowskii var. saviozae Forel, 1911c: 304 (s.) BRAZIL. Junior synonym of triconstricta: Wilson, 2003: 241.
  • discursans. Pheidole radoszkowskii var. discursans Forel, 1912f: 223 (s.q.) PARAGUAY. [First available use of Pheidole radoszkowskii subsp. acuta var. discursans Forel, 1909a: 258; unavailable name.] Junior synonym of triconstricta: Wilson, 2003: 241.
  • rosariensis. Pheidole triconstricta var. rosariensis Forel, 1913l: 230 (s.w.) ARGENTINA. Junior synonym of triconstricta: Wilson, 2003: 241.
  • hebe. Pheidole triconstricta var. hebe Santschi, 1923d: 55 (s.w.) BOLIVIA. Junior synonym of triconstricta: Wilson, 2003: 241.

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


From Wilson (2003): A member of the diligens group distinguished by the following combination of traits.

Major: yellow, dorsal surface of head and all of body, including gaster, virtually hairless; promesonotal profile in dorsal-oblique view 3-lobed; rugoreticulum present mesad to the eyes; sculpturing of head confined to the portion level with and anterior to the eyes; posterior half of dorsal head surface, and all of the gaster, smooth and shiny; all of mesosoma and waist foveolate and opaque.

Minor: yellow; mesosoma bare of pilosity; all of head, mesosoma and waist, along with anterior strip of first gastral tergite, foveolate and opaque.

See also Pheidole anima, Pheidole diligens, Pheidole gagates, Pheidole nubila, Pheidole piceonigra, Pheidole radoszkowskii and Pheidole stigma.

MEASUREMENTS (mm) Lectotype major: HW 1.24, HL 1.26, SL 0.74, EL 0.22, PW 0.66. Paralectotype minor: HW 0.64, HL 0.66, SL 0.66, EL 0.12, PW 0.40.

COLOR Major and minor: concolorous yellow.

Pheidole triconstricta Wilson 2003.jpg

Figure. Upper: lectotype, major. Lower: paralectotype, minor. Scale bars = 1 mm.

Lectotype Specimen Labels

Type Material

ARGENTINA: Buenos Aires. Musee d'Histoire Naturelle Genève and Museum of Comparative Zoology - as reported in Wilson (2003)


L triconstricta, triply contracted, drawn together, evidently referring to the mesosoma, as seen in dorsal-oblique view. (Wilson 2003)


References based on Global Ant Biodiversity Informatics

  • Bestelmeyer B. T., and J. A. Wiens. 1996. The Effects of Land Use on the Structure of Ground-Foraging Ant Communities in the Argentine Chaco. Ecological Applications 6(4): 1225-40.
  • Boer P. 2019. Ants of Curacao, species list. Accessed on January 22 2019 at
  • Bruch C. 1914. Catálogo sistemático de los formícidos argentinos. Revista del Museo de La Plata 19: 211-234.
  • Cuezzo, F. 1998. Formicidae. Chapter 42 in Morrone J.J., and S. Coscaron (dirs) Biodiversidad de artropodos argentinos: una perspectiva biotaxonomica Ediciones Sur, La Plata. Pages 452-462.
  • Dattilo W., N. Sibinel, J. C. F. Falcao, and R. V. Nunes. 2011. Ant fauna in a urban remnant of Atlantic forest in the municipuality of Marilia, state of Sao Paulo, Brazil. Bioscience Journal 27(3): 494-504.
  • Fernandes T. T., R. R. Silva, D. Rodrigues de Souza-Campana, O. Guilherme Morais da Silva, and M. Santina de Castro Morini. 2019. Winged ants (Hymenoptera: Formicidae) presence in twigs on the leaf litter of Atlantic Forest. Biota Neotropica 19(3):
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Forel A. 1911. Ameisen des Herrn Prof. v. Ihering aus Brasilien (Sao Paulo usw.) nebst einigen anderen aus Südamerika und Afrika (Hym.). Deutsche Entomologische Zeitschrift 1911: 285-312.
  • Forel A. 1912. Formicides néotropiques. Part III. 3me sous-famille Myrmicinae (suite). Genres Cremastogaster et Pheidole. Mémoires de la Société Entomologique de Belgique. 19: 211-237.
  • Forel A. 1913. Fourmis d'Argentine, du Brésil, du Guatémala & de Cuba reçues de M. M. Bruch, Prof. v. Ihering, Mlle Baez, M. Peper et M. Rovereto. Bulletin de la Société Vaudoise des Sciences Naturelles. 49: 203-250.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Kusnezov N. 1952. El género Pheidole en la Argentina (Hymenoptera, Formicidae). Acta Zoologica Lilloana 12: 5-88.
  • Kusnezov N. 1953. La fauna mirmecológica de Bolivia. Folia Universitaria. Cochabamba 6: 211-229.
  • Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
  • Luederwaldt H. 1918. Notas myrmecologicas. Rev. Mus. Paul. 10: 29-64.
  • Pignalberi C. T. 1961. Contribución al conocimiento de los formícidos de la provincia de Santa Fé. Pp. 165-173 in: Comisión Investigación Científica; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina) 1961. Actas y trabajos del primer Congreso Sudamericano de Zoología (La Plata, 12-24 octubre 1959). Tomo III. Buenos Aires: Librart, 276 pp.
  • Santschi F. 1912. Quelques fourmis de l'Amérique australe. Revue Suisse de Zoologie 20: 519-534.
  • Santschi F. 1925. Fourmis des provinces argentines de Santa Fe, Catamarca, Santa Cruz, Córdoba et Los Andes. Comunicaciones del Museo Nacional de Historia Natural "Bernardino Rivadavia" 2: 149-168.
  • Santschi F. 1929. Nouvelles fourmis de la République Argentine et du Brésil. Anales de la Sociedad Cientifica Argentina. 107: 273-316.
  • Santschi F. 1931. Contribution à l'étude des fourmis de l'Argentine. Anales de la Sociedad Cientifica Argentina. 112: 273-282.
  • Suguituru S. S., M. Santina de Castro Morini, R. M. Feitosa, and R. Rosa da Silva. 2015. Formigas do Alto Tiete. Canal 6 Editora 458 pages
  • Vittar, F. 2008. Hormigas (Hymenoptera: Formicidae) de la Mesopotamia Argentina. INSUGEO Miscelania 17(2):447-466
  • Vittar, F., and F. Cuezzo. "Hormigas (Hymenoptera: Formicidae) de la provincia de Santa Fe, Argentina." Revista de la Sociedad Entomológica Argentina (versión On-line ISSN 1851-7471) 67, no. 1-2 (2008).
  • Wheeler, William Morton. 1911. Ants Collected in Grenada, W.I. by Mr. C. T. Brues. Bulletin of the Museum of Comparitive Zoology at Harvard College. 54(5):166-172.
  • Zolessi L. C. de, Y. P. Abenante, and M. E. de Philippi. 1988. Lista sistematica de las especies de Formicidos del Uruguay. Comun. Zool. Mus. Hist. Nat. Montev. 11: 1-9.
  • de Zolessi, L.C., Y.P. de Abenante and M.E. Philippi. 1987. Lista sistemática de las especies de formícidos del Uruguay. Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo 11(165):1-9
  • de Zolessi, L.C., Y.P. de Abenante and M.E. Phillipi. 1989. Catalago Systematico de las Especies de Formicidos del Uruguay (Hymenoptera: Formicidae). Oficina Regional de Ciencia y Technologia de la Unesco para America Latina y el Caribe- ORCYT. Montevideo, Uruguay