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


This species is a host for the diapriid wasp Gymnopria lucens (a parasite) in Brazil, Uruguay (Loiacono, 1987; Gonzalez et al., 2016).



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).