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|Senior synonym of Strumigenys unispinulosa: Emery, 1895d PDF: 326; Brown, 1953g: 28; of Strumigenys laticephala: Smith, 1951c: 826; Brown, 1953g: 28; of Strumigenys bruchi, Strumigenys costaricensis, Strumigenys cubaensis, Strumigenys guatemalensis, Strumigenys longicornis, Strumigenys obscuriventris, Strumigenys soledadensis: Brown, 1953g: 28; of Strumigenys clasmospongia, Strumigenys fusca, Strumigenys unidentata: Brown, 1961a: 64; of Strumigenys producta: Bolton, 2000: 524; of Strumigenys wani: Bolton, Sosa-Calvo, et al. 2008: 62.|
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.
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.
Found most commonly in these habitats: 9 times found in 2º tropical rainforest, 4 times found in garden, 1 times found in shade coffee, 4 times found in tropical rainforest, 1 times found in pine/oak managed forest, 3 times found in wet forest, 2 times found in montane rainforest clearing, 1 times found in dry forest stream edge, 1 times found in yard around house, 2 times found in dry forest, ...
Collected most commonly using these methods or in the following microhabitats: 10 times search, 11 times MiniWinkler, 7 times Winkler, 5 times MaxiWinkler, 2 times Malaise, 2 times Berlese, 1 times Under rock, 1 times nest in stump, brood in nest, same stump as Solenopsis, 1 times On Lilium longiflorum, 1 times pitfall, 1 times Colecta manual, ...
Elevations: collected from 5 - 1990 meters, 342 meters average
Type specimens: syntype of Strumigenys bruchi: casent0904939, casent0909323; syntype of Strumigenys fusca: casent0904934; syntype of Strumigenys unispinulosa: casent0904935; syntype of Strumigenys unispinulosa longicornis: casent0905785