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Species: Strumigenys elongata   Roger, 1863 

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See Also:

Strumigenys elongata_cf, Strumigenys elongata nicaraguensis

Taxonomic History (provided by Barry Bolton, 2015)

Strumigenys elongata Roger, 1863a PDF: 212 (w.) PANAMA. Neotropic. AntCat AntWiki

Taxonomic history

Brown, 1954c PDF}: 191 (q.m.); Wheeler & Wheeler, 1955a PDF: 138 (l.).
Senior synonym of Strumigenys imitator, Strumigenys nicaraguensis: Brown, 1954c PDF}: 189; of Strumigenys rishwani: Bolton, Sosa-Calvo, et al. 2008: 62.
See also: Bolton, 2000: 510.


Southern Mexico to Bolivia and southeastern Brazil. Costa Rica: common in all lowland sites; absent from wet montane forest.


Brown and Wilson (1959) summarize the genus as follows:
"Widespread in tropics and warm temperate areas. Primarily forest-dwelling; some species occur in grassland and arid scrub. ... Nests mostly in soil and rotting wood; a few species live in arboreal plant cavities in tropical rain forest. Foraging hypogaeic to epigaeic-arboreal. Food: most species are collembolan feeders; a few are polyphagous predators or occasionally feed on sugary substances..."

Members of the genus are all predaceous, with a kinetic mode of attack (Bolton 1999).

elongata is one of the most common Strumigenys species in forested habitats of Costa Rica. It occurs in dry and wet forests. It may nest on the forest floor in dead wood or under stones, or under epiphytes in the canopy. Brown (1954, 1962) reports that it is definitely a collembolan feeder.


Longino notes, 9 Nov 2013: In Central America, Strumigenys elongata, pariensis, spathula, and morphospecies JTL022 form a single DNA barcoding cluster with subclusters. Strumigenys elongata occurs as two clusters with 3-5% sequence difference but the specimens are broadly sympatric and no morphological correlate was found. JTL022 is 2 specimens from one miniWinkler, Cerro Cahuí, Guatemala. It is small, has short propodeal spines, short mandibles, large elongate femoral glands, and thickened but coachwhip-like gastral setae like pariensis. Strumigenys spathula is morphologically distinct but has discordant DNA barcode data. A Chiapas specimen and a Cerro Cahuí specimen of spathula are distant by DNA barcode, about 5% sequence divergence, but look the same. The Cerro Cahui specimen clusters closer to a Nicaraguan specimen of pariensis.


Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 33:1639-1689.

Bolton, B. 2000. The ant tribe Dacetini, with a revision of the Strumigenys species of the Malagasy Region by Brian L. Fisher, and a revision of the Austral epopostrumiform genera by Steven O. Shattuck. Memoirs of the American Entomological Institute 65:1-1028.

Brown, W. L., Jr. 1954(1953). The neotropical species of the ant genus Strumigenys Fr. Smith: Group of elongata Roger. Journal of the New York Entomological Society 61:189-200.

Brown, W. L., Jr. 1962. The neotropical species of the ant genus Strumigenys Fr. Smith: Synopsis and keys to the species. Psyche 69:238-267.

Brown, W. L., Jr., Wilson, E. O. 1959. The evolution of the dacetine ants. Quarterly Review of Biology 34:278-294.

Taxon Page Author History

On 2013-11-09 17:17:00 jack longino modified Comments
On 2013-11-09 17:09:11 jack longino modified Biology

Taxonomic Treatment (provided by Plazi)

Roger, J., 1863:
[[ worker ]] fest 2 Millim. lang, rostroth, matt, Fuehler und Beine heller roethlichgelb. Der Kopf (bei reinen Stuecken wahrscheinlich der ganze Koerper) mit hakenfoermigen, an der Spitze etwas verdickten, abstehenden Haerchen sparsam besetzt (die angeklebt wie glanzlose Schuppen erscheinen); derselbe ist hinten stark ausgerandet mit breiten gerundeten Ecken, nach vorn sehr verschmaelert, am Fuehlerursprung am engsten; Augen am Unterrande der langen und breiten Seitenfurche, ziemlich in der Mitte. Der Faehlerschaft ist viel laenger und schlanker ass bei Gundlachi . Die Mandibeln sind an der Basis einander sehr genaehert, gleich breit bis zur Spitze, parallel, die Spitze ist rechtwinklig umgebogen und jederseits in zwei spitze Zaehne getheilt, die noch mal so lang sind als bei Gundlachi . (Die Mandibeln sind denen von Louisianae aehnlich, aber schlanker und etwas laenger.) Der Clipeus ist deutlich dreieckig und reicht mit der hintern Spitze bis in die Hoehe des Fuehlerursprungs. Kopf und Thorax sind wie bei Gundlachi fingerhutartig punktirt. Der Thorax ist an den stumpfen Vorderecken am breitesten, vorn quer gerandet, vor diesem Rand halsfoermig verengt, ueber den Ruecken laeuft eine schwach erhabene Laengslinie; das Metanotum endet in 2 spitzige, nach hinten und aufwaerts gerichtete Dornen. Knoten wie bei Gundlachi , fein fingerhutartig punktirt, der zweite scheint schmaeler zu sein als bei jener Art. Abdomen glaenzend, dunkelbraun, gegen die Spitze heller, an der Basis kurz laengs gerunzelt.
Panama, ein einzelner [[ worker ]].
Diese Art ist durch die Mandibeln und den laengern und schlankern Fuehlerschaft von Gundlachi leicht zu unterscheiden.

Wild, A. L., 2007:
Canindeyú , Central Concepción (ALWC, BMNH, INBP, LACM, MHNG). Literature records: Canindeyú , Central, Concepción (Bolton 2000, Fowler 1981).

Specimen Habitat Summary

Found most commonly in these habitats: 158 times found in tropical rainforest, 93 times found in mature wet forest, 63 times found in 2º lowland rainforest, 53 times found in tropical moist forest, 48 times found in 2º wet forest, 46 times found in montane wet forest, 39 times found in tropical wet forest, 38 times found in 2º lowland tropical rainforest, 25 times found in 2º tropical rainforest, 18 times found in lowland wet forest, ...

Collected most commonly using these methods or in the following microhabitats: 461 times MiniWinkler, 70 times Winkler, 115 times MaxiWinkler, 30 times Berlese, 28 times Mini Winkler, 5 times Night MiniWinkler, 5 times search, 1 times under log, 1 times Baiting, 1 times Malaise

Elevations: collected from 10 - 1350 meters, 263 meters average

Type specimens: syntype of Strumigenys imitator: casent0900445, casent0915691

(-1 examples)

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