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Mexico to Paraguay (Lattke 1995, Brown 1958). Costa Rica: wet forests of both slopes to 500m.
Brown, W. L., Jr. 1958. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bulletin of the Museum of Comparative Zoology 118:175-362.
Lattke, J. E. 1990. Revision del genero Gnamptogenys Mayr para Venezuela. Acta Terramaris 2:1-47.
Lattke, J. E. 1995. Revision of the ant genus Gnamptogenys in the New World (Hymenoptera: Formicidae). Journal of Hymenoptera Research 4:137-193.
Mayr, G. 1870. Neue Formiciden. Verhandlungen der zoologische-botanische Gesellschaft Wien 20:939-996.
Pratt, S. C. 1994. Ecology and behavior of Gnamptogenys horni (Formicidae: Ponerinae). Insectes Sociaux 41:255-262.
Central (INBP). Literature records: Cordillera (Forel 1909).
Found most commonly in these habitats: 12 times found in montane wet forest, 2 times found in roadside vegetation, 1 times found in moist forest, 2 times found in wet forest, 3 times found in mature wet forest, 1 times found in Narrow strip of riparian forest, surrounded by steep pastures, 1 times found in rainforest, 1 times found in rainforest edge, 1 times found in 2nd growth forest, 1 times found in tropical wet forest, ...
Found most commonly in these microhabitats: 1 times nest in live stems Myriocarpa, 1 times In Cecropia insignis sapling, 3 times ex sifted leaf litter, 1 times N-S leg of LEP; recent treefall; small Stryphnodendron and some other tree; the, 1 times in Cecropia sapling, 2 times Copa de arbol, 1 times Sobre Vegetacion, strays on vegetation times night collecting near blacklight #3. #3408-s, 1 times Nest in 17mm dia live stem of fleshy herb, 1 times Lowland wet forest. Gnamptogenys with prey. Selva Verde Lodge., 1 times in treefall, ...
Collected most commonly using these methods: 6 times search, 10 times Malaise, 3 times Fogging, 3 times miniWinkler, 2 times Foggin, 1 times Sweeping, 1 times beating.
Elevations: collected from 10 - 1090 meters, 381 meters average