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Species: Pseudomyrmex elongatus   (Mayr, 1870) 

Download Data

Taxonomic History (provided by Barry Bolton, 2020)

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.
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Argentina, Aruba, Bahamas, Belize, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Saint Kitts and Nevis, Trinidad and Tobago, 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: 23 times found in tropical moist forest, 22 times found in edge of second-growth rainforest, 26 times found in red mangrove, 18 times found in tropical dry forest, 20 times found in rainforest edge, 12 times found in rainforest, 7 times found in 2º lowland rainforest, 5 times found in second-growth rainforest, 8 times found in CC 1500 m., 8 times found in mangrove, ...

Found most commonly in these microhabitats: 55 times on low vegetation, 27 times ex dead twig, 14 times beating vegetation, 18 times nest in twig above ground, 10 times Malaise trap, 9 times copa de árbol, 6 times ex dead twig of Ficus, 7 times recent tree-fall, 4 times ex dead twig of vine, 2 times ex dead twig of Gliricidia sepium, 5 times on tree trunk, ...

Collected most commonly using these methods: 29 times Fogging, 19 times search, 16 times Beating, 15 times Malaise, 11 times canopy fogging, 7 times direct collection, 7 times malaise trap, 5 times hand collecting, 5 times beating low vegetation, 4 times yellow bowl trap, 00 times collected manually on live tree bole within Ft. Jefferson, 10, ...

Elevations: collected from 1 - 1269 meters, 270 meters average

Collect Date Range: collected between 1906-01-01 and 2019-05-29

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

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