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Costa Rica, Panama, Guyana (type locality), Trinidad, Colombia, Peru, Bolivia (Kempf 1975, Longino 1988). Costa Rica: La Selva Biological Station.
In Costa Rica, this species is known from a single specimen, from La Selva Biological Station (SSE 700), in a berlese sample of litter and soil from the forest floor. A Brazilian species, Thaumatomyrmex mutilatus, is a specialist predator of polyxenid millipedes (Brandao et al. 1991), and thus atrox may be as well.
Brandao, C. R. F., J. L. M. Diniz, and E. M. Tomotake. 1991. Thaumatomyrmex strips millipedes for prey, a novel predatory behaviour in ants and the first case of sympatry in the genus. Insectes Soc. 38:335-344.
Kempf, W. W. 1975. A revision of the Neotropical ponerine ant genus Thaumatomyrmex Mayr (Hymenoptera: Formicidae). Stud. Entomol. 18:95-126.
Longino, J. T. 1988. Notes on the taxonomy of the neotropical ant genus Thaumatomyrmex Mayr (Hymenoptera: Formicidae). In J. C. Trager (ed.), Advances in Myrmecology, pp. 35-42. E. J. Brill, New York.
Weber, N. A. 1939. New ants of rare genera and a new genus of ponerine ants. Ann. Entomol. Soc. Am. 32:91-104.
Found most commonly in these habitats: 6 times found in ridgetop cloud forest, isolated peak with oak trees, 3 times found in montane wet forest, along ridge leading to stream, oak trees present, probably mature or old 2nd growth with relict trees, near pasture, 2 times found in montane wet forest, 2 times found in mature wet forest, 1 times found in montane wet forest, along ridge leading to stream, oak trees, near pasture, 1 times found in montane wet forest, patch at road edge surrounding a small stream, other side of stream with more contiguous forest, less disturbed, possibly mature, 1 times found in montane wet forest, small patch at edge of road, probably 2ndary, Vachelia with Pseudomryemx ants presnt in understory, 1 times found in Narrow strip of riparian forest, surrounded by steep pastures, 1 times found in 1� forest, 1 times found in rainforest, ...
Found most commonly in these microhabitats: 19 times ex sifted leaf litter, 2 times leaf litter and small twigs nest collected, 1 times leaf litter on mangrove islands, 1 times leaf litter, 1 times Ex horjarasca, 1 times Ex hojarasca.
Collected most commonly using these methods: 12 times miniWinkler, 6 times maxiWinkler, 2 times ex berlese funnel, 1 times Winkler, 1 times Berlese, 1 times litter sample.
Elevations: collected from 50 - 1100 meters, 648 meters average