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Species: Strumigenys louisianae   Roger, 1863 

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See Also:

Strumigenys louisianae costaricensis, Strumigenys louisianae guatemalensis, Strumigenys louisianae laticephala, Strumigenys louisianae obscuriventris, Strumigenys louisianae soledadensis

Taxonomic History (provided by Barry Bolton, 2015)

Strumigenys louisianae Roger, 1863a PDF: 211 (w.) U.S.A. Nearctic. AntCat AntWiki

Taxonomic history

Emery, 1895d PDF: 326 (q.); Haug, 1932 PDF: 170 (m.); Wheeler & Wheeler, 1955a PDF: 136 (l.).
Senior synonym of Strumigenys unispinulosa: Emery, 1895d PDF: 326; Brown, 1953g PDF}: 28; of Strumigenys laticephala: Smith, 1951c: 826; Brown, 1953g PDF}: 28; of Strumigenys bruchi, Strumigenys costaricensis, Strumigenys cubaensis, Strumigenys guatemalensis, Strumigenys longicornis, Strumigenys obscuriventris, Strumigenys soledadensis: Brown, 1953g PDF}: 28; of Strumigenys clasmospongia, Strumigenys fusca, Strumigenys unidentata: Brown, 1961a PDF}: 64; of Strumigenys producta: Bolton, 2000: 524; of Strumigenys wani: Bolton, Sosa-Calvo, et al. 2008: 62.
See also: Wilson, 1954a PDF: 481; Bolton, 2000: 525.


Throughout tropical and subtropical America, from the southern United States to Argentina. In Costa Rica, known from Atlantic and Pacific lowlands, and the Meseta Central.


Natural History:

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).

The feeding habits of louisianae have been studied by Wilson (1950, 1954) and Brown (1962). Workers take live prey, mostly small arthropods in litter and soil. Preferred prey are entomobryoid and symphypleonan Collembola; poduroid collembolans are not taken.

The species prefers synanthropic and/or seasonally dry habitats. It is more abundant in the peripheral parts of its range (Costa Rica northward, southern Brazil southward) than in the center (Panama southward to Amazonian Brazil) (Brown 1961).


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. 1953. Revisionary studies of the ant tribe Dacetini. American Midland Naturalist 50:1-137.

Brown, W. L., Jr. 1961. The neotropical species of the ant genus Strumigenys Fr. Smith: Miscellaneous concluding studies. Psyche 68:58-69.

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.

Wilson, E. O. 1950. Notes on the food habits of Strumigenys louisianae Roger (Hymenoptera: Formicidae). Bulletin of the Brooklyn Entomological Society 45: 85-86.

Wilson, E. O. 1954 ("1953"). The ecology of some North American dacetine ants. Annals of the Entomological Society of America 46:479-495.

Taxonomic Treatment (provided by Plazi)

Roger, J., 1863:
[[ worker ]] 2.5 Millirn. lang, Gundlachi bis auf die verschiedenen Mandibeln sehr aehnlich, rostroth, matt, fingerhutartig punktirt, aber minder scharf als bei jener Art. Der Kopf ist reichlicher, der Koerper sparsamer (bei reinen Exemplaren wahrscheinlich das ganze Thierchen) mit ziemlich dicken, weisslichen, kaum glaenzenden Schuppen zerstreut besetzt; andere Stuecke zeigen abstehende, an der Spitze gekruemmte und keulenfoermige Boerstchen (die, angeklebt, die erwaehnten Schuppen zu bilden scheinen). Die Mandibeln haben einige Aehnlichkeit mit denen von Odontomach. haematodes , sind platt, schmal, etwas kuerzer als bei Gundlachi , an der Basis und Spitze einander gleich nahe, ohne jedoch sich am Innenrande zu beruehren, und an der Spitze rechtwinklig umgebogen; diese ist gabelfoermig gespalten mit 2 spitzigen Zaehnen. Der Thorax ist wie der Kopf punktirt, sonst aber, wie alles Uebrige auch, der P. Gundlachi gleich, nur ist der Kopf hinten deutlich breiter, als bei letzterer Art. Das Abdomen ist hinten oefter schwaerzlich, etwas glaenzend, sehr undeutlich gerunzelt, hat aber an der Basis deutliche kurze Laengsrunzeln. Louisiana, einige [[ worker ]].

Wild, A. L., 2007:
Alto Paraná , Canindeyú , Central, Concepción , Itapúa , Paraguarí (ALWC, BMNH, MHNG). Literature records: Alto Paraná , Canindeyú , Central, Concepción , Itapúa , Paraguarí (Bolton 2000, Fowler 1981).

Specimen Habitat Summary

Found most commonly in these habitats: 14 times found in leaf litter, 9 times found in 2º tropical rainforest, 1 times found in shade coffee, 4 times found in garden, 3 times found in tropical rainforest, 1 times found in pine/oak managed forest, 3 times found in wet forest, 1 times found in dry forest stream edge, 2 times found in montane rainforest clearing, 1 times found in isolated clearing in mature wet forest area, open lawn area at edge of building., ...

Collected most commonly using these methods or in the following microhabitats: 15 times Winkler, 20 times Berlese, 13 times search, 11 times MiniWinkler, 5 times MaxiWinkler, 2 times Malaise, 0 times Under rock, 1 times Colecta manual, 1 times pitfall, 1 times in copula, 0 times Leaf litter, ...

Elevations: collected from 5 - 1990 meters, 296 meters average

Type specimens: syntype of Strumigenys unidentata: casent0915694; syntype of Strumigenys bruchi: casent0904939, casent0909323; syntype of Strumigenys fusca: casent0904934; syntype of Strumigenys unispinulosa: casent0904935; syntype of Strumigenys unispinulosa longicornis: casent0905785

(-1 examples)

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