Acromyrmex ambiguus

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Acromyrmex ambiguus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Acromyrmex
Species: A. ambiguus
Binomial name
Acromyrmex ambiguus
(Emery, 1888)

Acromyrmex ambiguus casent0281786 p 1 high.jpg

Acromyrmex ambiguus casent0281786 d 1 high.jpg

Specimen Labels


Acromyrmex ambiguus is common in Rio Grande do Sul, Brazil. They harvest monocotyledonous leaves (Loeck and Grutzmacher 2001) and masticate their collected plant material into tiny pieces to create the substrate for growing their fungal gardens. A molecular study of co-occuring populations of this species and Acromyrmex heyeri showed both of these species are cultivating Leucoagaricus gongylophorus but that there are differences in the fungal strains used by the two ant species (Pereira et al. 2015).



Distribution based on Regional Taxon Lists

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

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.

  • ambiguus. Atta (Acromyrmex) lundi var. ambigua Emery, 1888c: 358 (w.) BRAZIL. Goni et al., 1983: 365 (k.). Combination in Acromyrmex: Bruch, 1914: 216. Raised to species: Emery, 1905c: 50. Senior synonym of erectus: Gonçalves, 1961: 131.
  • erectus. Acromyrmex ambiguus var. erectus Santschi, 1925a: 384, fig. 2 (w.) BRAZIL. Junior synonym of ambiguus: Gonçalves, 1961: 131.



2n = 38, karyotype = 2M+6SM+16ST+14A (Uruguay) (Goñi et al., 1984).


  • Bollazzi, M., and Roces, F. 2007. To build or not to build: circulating dry air organizes collective building for climate control in the leaf-cutting ant Acromyrmex ambiguous. Anim. Behav. 74: 1349–1355.
  • Bruch, C. 1914. Catálogo sistemático de los formícidos argentinos. Rev. Mus. La Plata 19: 211-234 (page 216, Combination in Acromyrmex)
  • Emery, C. 1888c [1887]. Formiche della provincia di Rio Grande do Sûl nel Brasile, raccolte dal dott. Hermann von Ihering. Bull. Soc. Entomol. Ital. 19: 352-366 (page 358, worker described)
  • Emery, C. 1905f. Revisione delle specie del genere Atta appartenenti ai sottogeneri Moellerius e Acromyrmex. Mem. R. Accad. Sci. Ist. Bologna (6)2:39-54 (page 50, raised to species)
  • Gonçalves, C. R. 1961. O genero Acromyrmex no Brasil (Hym. Formicidae). Stud. Entomol. 4: 113-180 (page 131, senior synonym of erectus)
  • Goñi, B., Zolessi, L.C. de, Imai, H.T. 1984. Karyotypes of thirteen ant species from Uruguay (Hymenoptera, Formicidae). Caryologia 36: 363-371.
  • Loek and Grutamacher. 2001 Ocorrência de formigas cortadeiras nas principais regiões agropecuárias do Estado do Rio Grande do Sul. Pelotas: UFPEL, 2001. 1v.
  • Pereira, D. I. B., S. d. A. Botton, M. I. d. Azevedo, D. U. Monteiro, C. Weiblen, V. S. Machado, M. G. Donatti, and A. E. Loeck. 2015. Isolation and molecular characterization of symbiotic fungus from Acromyrmex ambiguus and Acromyrmex heyeri ants of Rio Grande do Sul State, Brazil. Ciência Rural. 45:1256-1261. doi:10.1590/0103-8478cr20141064