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Species: Pseudomyrmex elongatus   (Mayr, 1870) 

Classification:
Download Data

See Also:

Pseudomyrmex elongatus cubaënsis

Taxonomic History (provided by Barry Bolton, 2017)

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:


Australasia Region: Central
Nearctic Region: Florida, Texas
Neotropical Region: Aragua, Argentina, Atlántida, Belize, Bolivia, Brazil, Cauca, Chiapas, Colombia, Costa Rica, Cuba, Distrito Capital, Ecuador, El Salvador, Escuintla, Formosa, French Guiana, Gracias a Dios, Guatemala, Guayas, Guyana, Heredia, Honduras, Izabal, Jalisco, Limón, Madre de Dios, Magdalena, Masaya, Mato Grosso, Nayarit, Nicaragua, Panama, Panamá Oeste, Paraguay, Peru, Petén, Pichincha, Puntarenas, Región Autónoma del Atlántico Norte, Región Autónoma del Atlántico Sur, Rondônia, San Luis Potosi, Sololá, Suriname, Trinidad and Tobago, Trujillo, Valle del Cauca, Venezuela, Veracruz, Yucatán, Zulia

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).




Biology:

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.

Identification:

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).

References:

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: 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, 5 times found in tropical rainforest, 4 times found in tropical dry forest, 5 times found in mangrove, 0 times found in Tropical hardwood forest, 5 times found in SAT, 3 times found in tropical wet forest, ...

Found most commonly in these microhabitats: 14 times beating vegetation, 9 times Malaise trap, 9 times copa de árbol, 3 times ex dead twig, 6 times on low vegetation, 1 times foragers on treefall, st times Virola tree felled yesterday at edge of lab clearing behind new lab. #3381-s, 3 times strays, 2 times collecting from Carapa guianensis, felled yesterday, along new roadcut just beyo, 2 times beating veg., 1 times nest in hollow branch, ...

Collected most commonly using these methods: 29 times Fogging, 18 times search, 16 times Beating, 14 times Malaise, 18 times Nest in twig above ground, 5 times hand collecting, 6 times ex dead twig, 00 times collected manually on live tree bole within Ft. Jefferson, 10, 1 times Dead twig, 4 times Foraging, 0 times On sea grape, ...

Elevations: collected from 1 - 1240 meters, 215 meters average

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



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