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Panama, Costa Rica, Colombia (type locality), Trinidad, Guianas. Costa Rica: widespread below 500m.
Atta (Trachymyrmex) cornetzi Forel 1912:183. Worker, queen: Colombia. Combination in Trachymyrmex: Gallardo, 1916:242. Senior synonym of annulatus, bivittatus, brevispinosus, gatun, naranjo and uncifer: Weber, 1958:49.
Trachymyrmex cornetzi inhabits wet and dry forest habitats. It seems to prefer relatively open areas with a thin litter layer. Nests are in the soil.
This species is relatively common at La Selva Biological Station. Nests have been excavated by attine specialists in the laboratory clearing, it has been collected at honey/crisco baits in the forest, and the ALAS project has collected it in Winkler and Berlese samples.
One nest I excavated at La Selva was 10cm deep, with a 4cm diameter spherical chamber containing a fungus garden. The nest entrance was completely unadorned and led straight down to the chamber. The nest was collected on 1 July 1992 and contained abundant alate queens and a few adult males.
Another nest I excavated was in Manuel Antonio National Park. A nest was in clay soil in the middle of a trail. There was an asymmetrical pile of soil at the nest entrance, and a 3-4cm diameter fungus nest in a chamber about 5cm deep. A small Mycocepurus nest, with a small turret of clay soil, was within 5cm of the nest entrance of the Trachymyrmex.
I have also collected the species as ground foragers in Corcovado and Santa Rosa National Parks.
This species is similar to bugnioni. The two species are sympatric in the northwestern lowlands of Costa Rica.
Jeffry Sossa examined the types of T. cornetzi and T. intermedius, and kindly pointed out that my morphospecies JTL-001 was actually T. cornetzi, and what I had been calling T. cornetzi before was actually T. intermedius. I have fixed those errors with this version of the page.
Found most commonly in these habitats: 88 times found in mature wet forest, 34 times found in tropical rainforest, 24 times found in tropical rainforest, some big trees, 8 times found in wet forest, 12 times found in tropical rainforest, old second growth, 12 times found in tropical wet forest, 7 times found in lowland rainforest, 8 times found in mature rainforest, edge of forest near pasture and agricultural land, steep rocky terrain, 8 times found in tropical rainforest, some big trees, primary forest, 5 times found in rainforest, ...
Found most commonly in these microhabitats: 111 times ex sifted leaf litter, 91 times at bait, 11 times Hojarasca, 9 times Primary forest, 6 times Primary, 1 times nest in clay soil, 1 times at cookie bait, 1 times nest in ground, 1 times Wetterer #3, 1 times nest under stone, 1 times ground forager, ...
Collected most commonly using these methods: 93 times MiniWinkler, 91 times Baiting, 12 times Winkler, 15 times Lure/Bait, 11 times search, 15 times MaxiWinkler, 10 times Mini Winkler, 4 times Berlese, 5 times flight intercept trap, 1 times bait, 2 times yellow pan trap, ...
Elevations: collected from 5 - 1070 meters, 161 meters average
Type specimens: syntype of Atta cornetzi naranjo: casent0909390; syntype of Trachymyrmex cornetzi: casent0909389; syntype of Trachymyrmex annulatus: casent0912519; syntype of Trachymyrmex uncifer: casent0912520; type of Atta (Trachymyrmex) cornetzi: focol2197