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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: 2 times found in rainforest, 6 times found in ridgetop cloud forest, isolated peak with oak trees, 3 times found in mature wet forest, 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, 1 times found in 1� forest, 1 times found in El Platanal. Bosque Nublado, 1 times found in Fila El Viento, Bosque Seco, 1 times found in riparian rainforest, small strip of 2nd growth at side of river, bordering an old Cacao plantation with very open understory, lots of Vachelia ant plants in understory, 1 times found in lowland rainforest, ...
Found most commonly in these microhabitats: 21 times ex sifted leaf litter, 2 times leaf litter and small twigs nest collected, 1 times Ex hojarasca, 1 times leaf litter on mangrove islands, 1 times leaf litter, 1 times Ex horjarasca.
Collected most commonly using these methods: 12 times miniWinkler, 6 times maxiWinkler, 1 times search, 3 times Winkler, 2 times ex berlese funnel, 1 times Berlese, 1 times litter sample.
Elevations: collected from 50 - 1100 meters, 576 meters average
Collect Date Range: collected between 1961-07-05 and 2020-02-16