Acromyrmex fracticornis

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Acromyrmex fracticornis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Acromyrmex
Species: A. fracticornis
Binomial name
Acromyrmex fracticornis
(Forel, 1909)

Acromyrmex fracticornis casent0173798 profile 1.jpg

Acromyrmex fracticornis casent0173798 dorsal 1.jpg

Specimen labels


This species was found to be a pest in pastures in Paraguay, feeding on the grasses Cenchrus ciliaris, Chloris gayana, Cynodon nlemfuensis, Digitaria eriantha, Megathyrsus maximus, Paspalum notatum, Urochloa brizantha, Urochloa decumbens, Urochloa mosambicensis and Urochloa ruziziensis (Sarubbi & Ramirez, 2020).



Latitudinal Distribution Pattern

Latitudinal Range: -16.256667° to -34.604°.

Tropical South

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Nesting Habits

Acromyrmex fracticornis constructs conspicuous nest turrets made of interlaced plant fragments. Corsarinsky et al. (2020) asked whether turrets are built by merely piling up nearby materials around the nest entrance, or whether ants incorporate different materials as the turret develops. Their experiments revealed that consolidation of the turret occurred both over time and from its base upwards. Different building behaviors are involved, namely (1) intermeshing grass fragments and twigs around the nest opening, (2) cementing the resulting mesh with soil pellets, and (3) lining the inner gallery wall. Nest turrets do not simply arise by the arbitrary deposition of nearby materials, since workers both selectively incorporate large materials at the beginning, and respond to the developing structure by reinforcing the intermeshed plant fragments over time.

  • Examples of turrets of unknown age from field nests of Acromyrmex fracticornis located in Formosa, Argentina. (a) Turret built with grass fragments, internally lined with soil pellets (not visible). (b) Lateral view of a turret built with grass fragments located on top of a slightly elevated mound composed of excavated soil pellets. (c) Example of a turret with two adjacent openings that merged and led to a single nest entrance at the soil level (not visible). (d) Example of a turret with three openings (yellow arrows). Excavated soil pellets are located in between the grass fragments. Photo credits: (a,b): F. Roces; (c,d): D. Römer. (Corsarinsky et al., 2020, Fig. 1).



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

  • fracticornis. Atta (Moellerius) fracticornis Forel, 1909a: 257 (w.) PARAGUAY.
    • Fowler, 1988: 286 (m.).
    • Combination in Acromyrmex (Moellerius): Forel, 1913l: 236.
    • Subspecies of landolti: Gonçalves, 1961: 126; Kempf, 1972a: 16.
    • Status as species: Emery, 1924d: 351; Santschi, 1925a: 388 (in key); Kusnezov, 1953b: 338; Kusnezov, 1956: 34 (in key); Fowler, 1988: 286; Brandão, 1991: 323; Bolton, 1995b: 55; Wild, 2007b: 30.
    • Senior synonym of jorgenseni: Gonçalves, 1961: 126; Kempf, 1972a: 16; Fowler, 1988: 286; Brandão, 1991: 323; Bolton, 1995b: 55.
  • jorgenseni. Acromyrmex (Moellerius) fracticornis var. jorgenseni Forel, 1913l: 236 (w.q.) ARGENTINA (Mendoza).
    • [Misspelled as joergenseni by Bruch, 1928: 346, and others.]
    • Bruch, 1916: 325 (m.).
    • Subspecies of fracticornis: Bruch, 1915: 529; Bruch, 1916: 325; Gallardo, 1916d: 335; Santschi, 1916e: 389; Emery, 1924d: 351; Santschi, 1925a: 388 (in key); Bruch, 1928: 346; Santschi, 1929d: 304.
    • Junior synonym of fracticornis: Gonçalves, 1961: 126; Kempf, 1972a: 16; Fowler, 1988: 286; Brandão, 1991: 323; Bolton, 1995b: 55.



References based on Global Ant Biodiversity Informatics

  • Bonetto A. A. 1959. Las hormigas "cortadoras" de la Provincia de Santa Fé (generos: Atta y Acromyrmex). Santa Fé, Argentina: Ministerio de Agricultura y Ganadería (Dirección General de Recurzos Naturales), 79 pp.
  • Brandao, C.R.F. 1991. Adendos ao catalogo abreviado das formigas da regiao neotropical (Hymenoptera: Formicidae). Rev. Bras. Entomol. 35: 319-412.
  • Bruch C. 1916. Contribución al estudio de las hormigas de la provincia de San Luis. Revista del Museo de La Plata 23: 291-357.
  • Bruch C. 1928. Estudios mirmecológicos. Anales del Museo Nacional de Historia Natural de Buenos Aires 34: 341-360.
  • 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.
  • Culebra Mason S., C. Sgarbi, J. Chila Covachina, J. M. Pena, N. Dubrovsky Berensztein, C. Margaria, and M. Ricci. 2017. Acromyrmex Mayr (Hymenoptera: Formicidae: Myrmicinae): species distribution patterns in the province of Buenos Aires, Argentina. Rev. Mus. Argentino Cienc. Nat. 19(2) 185-199.
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • 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.
  • Fowler H. G. 1985. Leaf-cutting ants of the genera Atta and Acromyrmex of Paraguay (Hymenoptera, Formicidae) Dtsch. Ent. Z., N. F. 32(1-3): 19-34.
  • Fowler H. G. 1988. Taxa of the neotropical grass-cutting ants, Acromyrmex (Hymenoptera: Formicidae: Attini). Científica (Jaboticabal) 16: 281-295.
  • Gallardo A. 1916. Notes systématiques et éthologiques sur les fourmis attines de la République Argentine. Anales del Museo Nacional de Historia Natural de Buenos Aires 28: 317-344.
  • Gonçalves C. R. 1961. O genero Acromyrmex no Brasil (Hym. Formicidae). Stud. Entomol. 4: 113-180.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Kusnezov N. 1956. Claves para la identificación de las hormigas de la fauna argentina. Idia 104-105: 1-56.
  • Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
  • Murua A. F., F. Cuezzo, and J. C. Acosta. 1999. La fauna de hormigas del Gran Bajo Oriental del departamento Valle Fertíl (San Juan, Argentina). Revista de la Sociedad Entomológica Argentina 58(3/4): 135-138.
  • 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. 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. 1925. Revision du genre Acromyrmex Mayr. Revue Suisse de Zoologie 31: 355-398.
  • Silva F. H. O., J. H. C. Delabie, G. B. dos Santos, E. Meurer, and M. I. Marques. 2013. Mini-Winkler Extractor and Pitfall Trap as Complementary Methods to Sample Formicidae. Neotrop Entomol 42: 351–358.
  • Ulyssea M.A., C. E. Cereto, F. B. Rosumek, R. R. Silva, and B. C. Lopes. 2011. Updated list of ant species (Hymenoptera, Formicidae) recorded in Santa Catarina State, southern Brazil, with a discussion of research advances and priorities. Revista Brasileira de Entomologia 55(4): 603-–611.
  • 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).
  • Wild, A. L. "A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)." Zootaxa 1622 (2007): 1-55.