Ectatomma brunneum

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Ectatomma brunneum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Ectatomma
Species: E. brunneum
Binomial name
Ectatomma brunneum
Smith, F., 1858

Ectatomma brunneum casent0173375 profile 1.jpg

Ectatomma brunneum casent0173375 dorsal 1.jpg

Specimen labels


Koch et al. (2018) sampled this species in Caryocar barsiliense trees, in southeastern Brazil cerrado, as part of a study examining species interactions in ant-plants.



Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Bolivia, Brazil (type locality), Colombia, Ecuador, French Guiana, Guyana, Panama, Paraguay, Peru, Suriname.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Bernardia et al (2017) examined the components and variability of E. brunneum sting venom in workers. The venom primarily consisted of proteins and peptides. Workers were sampled across a range of habitats and the venom composition varied with environment, apparently due to their diet.

Dambros et al. (2018) - Ectatomma brunneum was collected via arboreal fogging in an inundated northern Pantanal (Mato Grasso, Brazil) cambarazal forest. The seasonally flooded forest was dominated by Vochysia divergens Pohl. (Vochysiaceae), regionally known as cambará, a tree species considered invasive to the Pantanal’s natural fields.

Passos and Leal (2019) - This species was found attending extrafloral nectaries of the plant Turnera subulata in northeastern Brazil (12°16′24″S 38°57′20″W / 12.27333°S 38.95556°W / -12.27333; -38.95556) Caatinga vegetation. Ectatomma brunneum was classified as a subordinate species and was infrequently observed.

Association with Other Organisms

This species is a host for the eucharitid wasp Dicoelothorax platycerus (a parasite) (Universal Chalcidoidea Database) (primary host).



The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • quadridens. Formica quadridens Fabricius, 1793: 362 (w.) FRENCH GUIANA. [Junior primary homonym of Formica quadridens De Geer, 1773: 609 (now in Cephalotes).] Junior synonym and hence first available replacement name: Ectatomma brunnea Smith, F. 1858b: 103; designated by Bolton, 1995b: 187. Mann, 1916: 405 (m.); Santschi, 1921g: 83 (q.); Wheeler, G.C. & Wheeler, J. 1952a: 131 (l.). Combination in Ectatomma: Mayr, 1862: 732. Senior synonym of brunnea: Roger, 1860: 307.
  • brunneum. Ectatomma brunnea Smith, F. 1858b: 103 (w.q.) BRAZIL. Junior synonym of quadridens: Roger, 1860: 307, and hence first available replacement name for Formica quadridens Fabricius, 1793: 362. [Junior primary homonym of Formica quadridens De Geer, 1773: 609 (now in Cephalotes).]; designated by Bolton, 1995b: 186.

The following notes on F. Smith type specimens have been provided by Barry Bolton (details):

Ectatomma brunnea

Syntype worker in The Natural History Museum. “Santarem” (Brazil). The syntype queen can not be positively identified. In The Natural History Museum there is another worker and another queen, also from the type-locality of Santarem, but the worker has passed through the Farren White collection.



  • 2n = 44, karyotype = 22M+22A (Brazil) (Barros et al., 2008).


  • Bernardi, R. C., E. L. B. Firmino, A. Mendonca, D. Sguarizi-Antonio, M. C. Pereira, L. H. D. Andrade, W. F. Antonialli, and S. M. Lima. 2017. Intraspecific variation and influence of diet on the venom chemical profile of the Ectatomma brunneum Smith (Formicidae) ant evaluated by photoacoustic spectroscopy. Journal of Photochemistry and Photobiology B-Biology. 175:200-206. doi:10.1016/j.jphotobiol.2017.09.004
  • Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp. (page 186, Junior synonym and hence first available replacement name: Ectatomma brunnea )
  • Fabricius, J. C. 1793. Entomologia systematica emendata et aucta. Secundum classes, ordines, genera, species, adjectis synonimis, locis observationibus, descriptionibus. Tome 2. Hafniae [= Copenhagen]: C. G. Proft, 519 pp. (page 362, first available replacement name for Formica quadridens)
  • Dambros, J., V. F. Vindica, J. H. C. Delabie, M. I. Marques, and L. D. Battirola. 2018. Canopy Ant Assemblage (Hymenoptera: Formicidae) in Two Vegetation Formations in the Northern Brazilian Pantanal. Sociobiology. 65:358-369. doi:10.13102/sociobiology.v65i3.1932
  • Koch, E. B. A., W. Dattilo, F. Camarota, and H. L. Vasconcelos. 2018. From species to individuals: does the variation in ant-plant networks scale result in structural and functional changes? Population Ecology. 60:309-318. doi:10.1007/s10144-018-0634-5
  • Passos, F. C. S. and L. C. Leal. 2019. Protein matters: ants remove herbivores more frequently from extrafloral nectary-bearing plants when habitats are protein poor. Biological Journal of the Linnean Society. 127:407-416. doi:10.1093/biolinnean/blz033
  • Renard, D., Schatz, B., McKey, D.B. 2010. Ant nest architecture and seed burial depth: Implications for seed fate and germination success in a myrmecochorous savanna shrub. Ecoscience, 17 (2): 194-202.
  • Roger, J. 1860. Die Ponera-artigen Ameisen. Berl. Entomol. Z. 4: 278-312 (page 307, Junior synonym of quadridens: and hence first available replacement name for Formica quadridens)
  • Smith, F. 1858a. Catalogue of hymenopterous insects in the collection of the British Museum. Part VI. Formicidae. London: British Museum, 216 pp. (page 103, worker, queen described)