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Southern United States south to Peru and Bahia, Brazil (Lattke 1995). Costa Rica: Pacific lowlands.
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Brown, W. L., Jr., and W. W. Kempf 1968. Report on some neotropical ant studies. Papeis Avulsos de Zoologia, Sao Paulo 22:89-102.
Echols, H. 1964. Gnamptogenys hartmani discovered in Louisiana. Annals of the Entomological Society of America 57:137.
Lattke, J. E. 1995. Revision of the ant genus Gnamptogenys in the New World (Hymenoptera: Formicidae). Journal of Hymenoptera Research 4:137-193.
MacKay, W. P., and S. B. Vinson 1988 (1989). Rediscovery of the ant Gnamptogenys hartmani (Hymenoptera: Formicidae) in eastern Texas. Proceedings of the Entomological Society of Washington 91:127
Found most commonly in these habitats: 3 times found in ridgetop cloud forest, isolated peak with oak trees, 1 times found in rainforest, 1 times found in SCH, 1 times found in 1¡ forest, 1 times found in Sendero Tres Ríos, 1 times found in 2º tropical rainforest, 1 times found in tropical rainforest, with big trees, probably primary, 1 times found in 2º wet forest, 1 times found in wet forest, 1 times found in disturbed tropical dry forest, ...
Found most commonly in these microhabitats: 8 times ex sifted leaf litter, 2 times Hojarasca, 1 times worker on ground, 1 times night walk along trail that skirts south side of estuary, looping around to road, 1 times fungus gard of T. sepect. full, no Lpt Trachy 10 work. Ecatoma 10 work, 1 times foraging on ground, 1 times foragers at cookie bait, 1 times at bait.
Collected most commonly using these methods: 4 times miniWinkler, 3 times maxiWinkler, 3 times Winkler, 2 times Search, 1 times Baiting, 1 times hand collecting, 1 times litter sample, 1 times Pitfall.
Elevations: collected from 5 - 1080 meters, 299 meters average
Type specimens: paratype of Gnamptogenys turmalis: casent0900544