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Brown (unpublished) lists southern Mexico to mountains of Peru and northeast Brazil. Kempf (1972) lists Costa Rica, Colombia, Ecuador, Venezuela, Peru, Bolivia, Trinidad, Guianas, Brazil (AM, PA, CE, GB, RJ, SP). Costa Rica: Atlantic lowland wet forest to 800m; southern Pacific lowland wet forest to 1200m at Wilson Botanical Gardens near San Vito.
This species is relatively rare, compared to the similar and much more abundant P. harpax. Foragers occur on the forest floor, and are never arboreal.
Longino: I have observed one nest of impressa. In Corcovado National Park, I put dead tabanids on the ground in an area with scattered impressa workers. One picked up a tabanid and I tried to follow it, but it was easily disturbed, and it would constantly hide motionless under leaves. I eventually found a nest entrance in the center of a mud clump. The nest went horizontally back into a clay bank, a short distance to a gallery about 2cm broad and 1cm high.
J. Longino, 15 Oct 2021: The lectotype of P. transversa Emery 1890 is a dealate queen from Alajuela. Mackay and Mackay 2010 designated two workers from Juan Viñas as paralectotypes. The two Juan Viñas specimens are P. purpurascens Forel 1899.
Bolton, B. 1995. A New General Catalogue of the Ants of the World. Harvard University Press, Cambridge, Mass.
Emery, C. 1890. Studi sulle formiche della fauna neotropica. I-V. Bullettino della Societa Entomologica Italiana 22:38-80.
Emery, C. 1901. Notes sur les sous-familles des Dorylines et Ponerines (Famille des Formicides). Annales de la Societe Entomologique de Belgique 45:32-54.
Emery, C. 1911. Hymenoptera. Fam. Formicidae. Subfam. Ponerinae. Genera Insectorum 1181-125.
Kempf, W. W. 1961. As formigas do genero Pachycondyla Fr. Smith no Brasil (Hymenoptera: Formicidae). Revta Bras. Entomol. 10:189-204.
Kempf, W. W. 1972. Catalogo abreviado das formigas da Regiao Neotropical. Studia Entomol. 15:3-344.
Roger, J. 1861. Die Ponera-artigen Ameisen (Schluss). Berl. Entomol. Z. 5:1-54.
- Las Trincheras.
Found most commonly in these habitats: 20 times found in wet forest, 19 times found in tropical moist forest, 12 times found in montane wet forest, 9 times found in tropical rainforest, 9 times found in tropical wet forest, 7 times found in 2º lowland rainforest, 8 times found in 2º wet forest, 7 times found in rainforest, 5 times found in montane rainforest, 5 times found in mature wet forest, ...
Found most commonly in these microhabitats: 50 times at bait, 43 times ex sifted leaf litter, 9 times pan trap, 3 times foragers, 1 times forager on ground, 2 times beating veg., 2 times strays, 1 times nocturnal, 1 times nest under stone, 1 times nest in log, 1 times LeafLitter, ...
Collected most commonly using these methods: 50 times Baiting, 25 times MiniWinkler, 22 times Search, 11 times MaxiWinkler, 9 times Pan Trap, 8 times Winkler, 3 times flight intercept trap, 2 times beating, 2 times direct collection, 1 times yellow pan trap, 1 times fogging, ...
Elevations: collected from 5 - 1620 meters, 613 meters average
Collect Date Range: collected between 1895-08-01 and 2020-02-16
Type specimens: Lectotype of Pachycondyla fuscoatra montana: casent0907249; Lectotype of Pachycondyla fuscoatra transversa: casent0903887; syntype transversa: jtl008003; type of Ponera impressa: focol0951, focol0952, focol0953