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Species: Neivamyrmex swainsonii   (Shuckard, 1840) 

Download Data

Taxonomic History (provided by Barry Bolton, 2019)

Labidus swainsonii Shuckard, 1840a PDF: 201 (m.) BRAZIL. Neotropic. AntCat AntWiki HOL

Taxonomic history

Combination in Eciton: Forel, 1895b PDF: 121; in Neivamyrmex (Acamatus): Emery, 1900e: 187; in Neivamyrmex (Neivamyrmex): Borgmeier, 1948b PDF: 462; in Neivamyrmex: Borgmeier, 1953 PDF: 15.
Senior synonym of Neivamyrmex arizonense: Borgmeier, 1955 PDF: 454; of Neivamyrmex fallax, Neivamyrmex mexicanus: Snelling & Snelling, 2007 PDF: 490.


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Bolivia, Brazil, Costa Rica, Ecuador, Guatemala, Mexico, Nicaragua, Panama, United States
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Nearctic, Neotropical

Distribution Notes:

Southern USA to Argentina. Costa Rica: Northern Pacific lowlands, Atlantic lowlands, southern highlands.


Natural History:

I collected workers of this species under a rock on the ridge between Playa Naranjo and Playa Nancite in Santa Rosa National Park, an area of scrubby vegetation and grasses in a relatively xeric habitat. Ivette Perfecto collected workers in a coffee farm near Heredia. Curiously, males are known from La Selva Biological Station in the Atlantic lowlands and Wilson Botanical Garden in the southern mountains. During an 18-month program of sampling using blacklight traps at La Selva, as part of the ALAS project, males occurred in three different samples, in the months of March and May.


True N. swainsonii (TL Brazil) may not be conspecific with the Nearctic populations so identified.


The workers of this species have traditionally been identified as fallax Borgmeier 1953. Bob Johnson told me that fallax is a junior synonym of swainsonii, a species previously known only from males. This is an unofficial synonymy at this point.

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Neivamyrmex swainsonii   Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68: -1, (download) -1 21008
Neivamyrmex swainsonii   Snelling, G. C. & Snelling, R. R., 2007, New synonymy, new species, new keys to Neivamyrmex army ants of the United States., Advances in ant systematics (Hymenoptera: Formicidae): Homage to E. O. Wilson - 50 years of contributions. (Memoirs of the American Entomological Institute 80), pp. 459-550: 489-490, (download) 489-490 21290
Neivamyrmex swainsonii   Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55: 26, (download) 26 21367

Specimen Habitat Summary

Found most commonly in these habitats: 1 times found in 2° wet forest, 1 times found in coffee farms vic. Heredia, 4 times found in agricultural zone, 5 times found in SOR 750m., 2 times found in oak-juniper woodland, 2 times found in oak-pine-juniper woodland, 1 times found in xeric scrub, 3 times found in CCC 550m., 1 times found in Open desert with scattered Ephedra + Acacia + Mesquite., 1 times found in cloud forest, ...

Found most commonly in these microhabitats: 2 times ex sifted leaf litter, 3 times under stone, 1 times under rock in leaf litter under oak, 1 times La Cascada Cabinas. On porch of cabin, at lights., 1 times in raided Solenopsis xyloni nest., 1 times ex sifting forest litter, 1 times column on ground, 1 times raid attacking Pheidole, 1 times dusk column, 1 times rotten log on nest Atta texana, 1 times raiding columns, ...

Collected most commonly using these methods: 13 times Lighttrap, 1 times MaxiWinkler, 4 times pitfall, 1 times hand collecting, 2 times light trap, 1 times Booty dump, 1 times miniWinkler, 1 times search, 1 times at light, in classroom, 1 times Search, subterranean raid, 1 times blacklight, ...

Elevations: collected from 30 - 3150 meters, 931 meters average

Type specimens: Holotype of Neivamyrmex mexicanus: casent0902645; Holotype of Neivamyrmex swainsonii: casent0902641; syntype of Eciton aztecum: casent0905972; syntype of Eciton spininode militarium: casent0911404

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