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Species: Pseudomyrmex elongatus   (Mayr, 1870) 

Download Data

Taxonomic History (provided by Barry Bolton, 2019)

Pseudomyrma elongata Mayr, 1870a PDF: 413 (w.) COLOMBIA. Neotropic. AntCat AntWiki HOL

Taxonomic history

Senior synonym of Pseudomyrmex tandem: Creighton, 1957b PDF: 18; of Pseudomyrmex alliodorae (and its junior synonym Pseudomyrmex allidora): Ward, 1989a PDF: 419.
See also: Ward, 1985b PDF: 227; Ward, 1999B PDF: 519.


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Argentina, Bahamas, Belize, Brazil, Colombia, Costa Rica, Ecuador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Saint Kitts and Nevis, United States, Venezuela
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Nearctic, Neotropical

Distribution Notes:

Pseudomyrmex elongatus is a widely distributed and common species, occurring from Mexico to Argentina, with an outlying (and possibly introduced) population in Florida. The records of P. elongatus from Texas (Ward, 1985) are in error: they refer to P. caeciliae (see Ward, 1989).


Pseudomyrmex elongatus is a generalist inhabitant of dead twigs of woody plants. It has been collected in mangroves, old fields, along roadsides, and in forested habitats ranging from tropical dry forest to secondary and primary rain forest. Specific nest-site records include dead twigs of Avicennia germinans, Rhizophora mangle, Laguncularia racemosa, Baccharis halimifolia, Baccharis trinervis, Baccharis sp., Ficus spp., Vernonia patens, Terminalia catappa, Tecoma stans, Zanthoxylum culantrillo, Gliricidia sepium, Inga sp., Helicteres sp., Coccoloba sp., and Sapium sp. It has also been recorded nesting in live branches of Pithecellobium saman, Cecropia, Cordia alliodora, and Triplaris cumingiana. Thus, it appears that P. elongatus will occupy ant-plant domatia  opportunistically.


Among members of the oculatus group (see Ward, 1989), workers of elongatus can be recognized by the
following combination of features:
  • relatively small size (HW 0.56-0.68)
  • head densely punctate and predominantly opaque
  • eyes relatively long (REL 0.53-0.59; REL2 0.73-0.82)
  • petiole relatively short (PLI 0.79-1.09), with rounded dorsolateral margination

Taxonomic Notes:

P. elongatus is a common and widespread species whose key features are its relatively small size (HW 0.56-0.68); densely punctate and predominantly opaque head; long eyes (REL > 0.52, REL2 > 0.72); and relatively short, high petiole (PLI > 0.78).


Ward, P. S. 1985. The Nearctic species of the genus Pseudomyrmex (Hymenoptera: Formicidae). Quaestiones Entomologicae 21: 209-246.

Ward, P. S. 1989. Systematic studies on pseudomyrmecine ants: revision of the Pseudomyrmex oculatus and P. subtilissimus species groups, with taxonomic comments on other species. Quaestiones Entomologicae 25: 393-468.

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55

elongatus (MayrHNS 1870a).

Canindeyú, Central, Ñeembucú, Pte. Hayes, San Pedro (ALWC, IFML, INBP).

Specimen Habitat Summary

Found most commonly in these habitats: 26 times found in red mangrove, 11 times found in tropical moist forest, 7 times found in 2º lowland rainforest, 8 times found in CC 1500 m., 2 times found in moist forest, 6 times found in rainforest edge, 4 times found in tropical dry forest, 5 times found in tropical rainforest, 5 times found in Tropical hardwood forest, 5 times found in SAT, ...

Found most commonly in these microhabitats: 17 times on low vegetation, 18 times nest in twig above ground, 14 times beating vegetation, 10 times Malaise trap, 9 times ex dead twig, 9 times copa de árbol, 3 times dead twig, 3 times in fresh treefall, 4 times foraging on low vegetation, 1 times foragers on treefall, 3 times on tree trunk, ...

Collected most commonly using these methods: 29 times Fogging, 19 times search, 16 times Beating, 14 times Malaise, 7 times direct collection, 5 times hand collecting, 6 times malaise trap, 00 times collected manually on live tree bole within Ft. Jefferson, 10, 3 times beating low vegetation, 4 times yellow bowl trap, 2 times beating vegetation (15 minutes), ...

Elevations: collected from 1 - 1245 meters, 244 meters average

Type specimens: Lectotype of Pseudomyrmex elongatus: casent0915840; syntype of Pseudomyrma elongata tandem: casent0907537

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