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Guatemala (type locality), Honduras, Mexico, Costa Rica. Costa Rica: Atlantic lowlands, mid-elevation Pacific slope of Cordillera de Tilaran.
Atta (Trachymyrmex) intermedius Forel 1909:249. Worker: Guatemala. Combination in Trachymyrmex: Kempf, 1972:253.
Trachymyrmex intermedius inhabits wet and moist forest habitats. It seems to prefer relatively open areas with a thin litter layer. Nests are in the soil, with a spherical chamber just beneath the surface. The chamber is approximately 5cm diameter, containing a spongy white fungus garden.
At La Selva Biological Station it is relatively common in the laboratory clearing. Various attine researchers, including Jim Wetterer and Ted Schultz, have excavated colonies in the clearing. Azur Moulaert found workers cutting leaves of Callophyllum brasiliense in the open second growth of the La Guaria Annex of La Selva. I have collected ground foragers on the grounds of an ecotourism lodge in Tortuguero and in scrubby second growth forest at 800m on the Pacific slope below Monteverde.
Like Trachymyrmex in general, the species is extremely rare in Winkler samples of sifted litter, suggesting that it avoids areas of deep leaf litter or is poorly sampled by Winkler sifting for some other reason.
Jeffry Sossa examined the types of T. cornetzi and T. intermedius, and kindly pointed out that I had misidentified T. intermedius as T. cornetzi, and that what I had been calling morphospecies JTL-001 was probably T. cornetzi. I have fixed those errors with this version of the page.
Found most commonly in these habitats: 44 times found in 2º wet forest, 34 times found in tropical moist forest, 33 times found in lowland wet forest, 25 times found in tropical rainforest, 24 times found in 2º lowland rainforest, 2 times found in lab clearing, 1 times found in pasture, 1 times found in second growth vegetation, 5 times found in tropical moist forest at night, 4 times found in 2º lowland tropical rainforest, ...
Found most commonly in these microhabitats: 111 times at bait, 60 times ex sifted leaf litter, 1 times soil, 1 times cutting leaves of Callophyllum brasiliense, 1 times Wetterer #3, 1 times strays, 1 times Hojarasca, 2 times beating vegetation, 1 times nocturnal strays, 1 times nocturnal ground forager(s), 1 times Malaise trap, ...
Collected most commonly using these methods: 111 times Baiting, 33 times MiniWinkler, 12 times search, 18 times MaxiWinkler, 4 times Winkler, 5 times Night MiniWinkler, 2 times flight intercept trap, 2 times Beating, 1 times Berlese, 1 times Malaise, 1 times Mini Winkler, ...
Elevations: collected from 5 - 1014 meters, 237 meters average