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Ecuador, Colombia, Panama (type locality), Costa Rica. Costa Rica: Atlantic lowlands.
Trachymyrmex isthmicus Santschi 1931:280-281, figs 13-15.
Weber (1941) observed a nest of the species on Barro Colorado, Panama. He described the nest entrance as a small turret, and he reported on a nest relocation.
I know this species only from the La Selva Biological Station and vicinity in the Atlantic lowlands. I found one nest in the soil at the edge of the CEN trail. The nest was a single chamber, about 10cm deep and about 5cm in diameter. A fungus garden filled the chamber and there was a single colony queen. The species has also been collected at honey/manteca baits and as isolated workers in Winkler samples.
The species is fully described in MayhŽ-Nunez and Brand‹o (2007).
MayhŽ-Nunes, A. J., and C. R. F. Brand‹o. 2007. Revisionary studies on the attine ant genus Trachymyrmex Forel. Part 3: The jamaicensis group (Hymenoptera: Formicidae). Zootaxa 1444:1-21.
Santschi, F. 1931. Fourmis de Cuba et de Panama. Revista de Entomologia (Rio de Janeiro) 1:265-282.
Weber, N. A. 1941. The biology of the fungus-growing ants. Part VII. The Barro Colorado Island, Canal Zone, species. Revista de Entomologia (Rio de Janeiro) 12:93-130.
|Trachymyrmex||Mayhé-Nunes, A. J. & Brandão, C. R. F., 2007, Revisionary studies on the attine ant genus Trachymyrmex Forel. Part 3: The Jamaicensis group (Hymenoptera: Formicidae)., Zootaxa 1444, pp. 1-21: 3, (download)||3||21824|
|Trachymyrmex isthmicus||Mayhé-Nunes, A. J. & Brandão, C. R. F., 2007, Revisionary studies on the attine ant genus Trachymyrmex Forel. Part 3: The Jamaicensis group (Hymenoptera: Formicidae)., Zootaxa 1444, pp. 1-21: 8-11, (download)||8-11||21824||GoogleMaps|
Found most commonly in these habitats: 10 times found in tropical rainforest, some big trees, 6 times found in tropical wet forest, 7 times found in tropical rainforest, old second growth, 4 times found in mature wet forest, 1 times found in CCL 450, 1 times found in lowland rainforest, 1 times found in montane wet forest, 1 times found in SHO 650 m., 1 times found in SJ 2300, 1 times found in SSA 3400, ...
Found most commonly in these microhabitats: 22 times at bait, 7 times ex sifted leaf litter, 5 times Primary forest, 3 times Hojarasca, 1 times nest in soil, 1 times Primary, 1 times beating veg., 1 times All ants from Louisa Stark (OTS 89-1 student) study; litter and ground-nesting a.
Collected most commonly using these methods: 22 times baiting, 6 times Lure/Bait, 6 times miniWinkler, 4 times search, 2 times Winkler, 1 times beating, 1 times maxiWinkler, 1 times Mini Winkler.
Elevations: collected from 50 - 840 meters, 226 meters average