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Costa Rica (type locality), Panama, Colombia, Ecuador, Brazil (AM, Mato Grosso) (Lattke 1997).
Apterostigma dentigerum occurs in a variety of habitats in Costa Rica, including lowland wet forest, lowland dry forest, and montane forest. I have collected specimens from La Selva Biological Station and at 300m and 500m elevations on the Barva transect in Braulio Carrillo National Park, at 800m elevation in the Pe–as Blancas Valley east of Monteverde, and at Curu Wildlife Area at the tip of the Nicoya peninsula.
Most of my collections have been nocturnal foragers on the ground. I have never collected diurnal foragers and workers are relatively rare in Winkler samples of sifted litter, most of which are taken during the day. This suggests that workers stay in well-sheltered nests during the day.
I have found nests both in and under dead wood on the ground. Also I found a nest deep among dead roots of a stilt palm. The fungus garden is a flocculent white mass, usually suspended in a cavity. There is no hyphal envelope.
Lattke, J. E. 1997. Revisi—n del gŽnero Apterostigma Mayr (Hymenoptera: Formicidae). Arq. Zool. (S‹o Paulo) 34:121-221.
Wheeler, W. M. 1925. Neotropical ants in the collections of the Royal Museum of Stockholm. Ark. Zool. 17A (8):1-55.
Found most commonly in these habitats: 66 times found in mature wet forest, 8 times found in wet forest, 7 times found in tropical wet forest, 5 times found in tropical rainforest, 2 times found in disturbed tropical wet forest, 4 times found in lowland wet forest, 1 times found in 1º tropical rainforest, 1 times found in SSA, 2 times found in mature rainforest, 1 times found in CCL, ...
Found most commonly in these microhabitats: 77 times ex sifted leaf litter, 10 times nest in clay bank, 12 times Hojarasca, 1 times nest under wood over stream, 1 times nest under rotten log, 5 times at bait, 2 times fungus nest under roots, 2 times OTS 92-3 field problem on Apterostigma., 1 times nest in dead wood on ground, 1 times Hojarasca., 1 times CES 100-200. Two adjacent large nests under old board in leaflitter, closed-cano, ...
Collected most commonly using these methods: 69 times MiniWinkler, 34 times search, 18 times Winkler, 5 times baiting, 5 times Pitfall, 3 times maxiWinkler, 4 times Mini Winkler, 1 times hand collecting, 1 times Berlese, 1 times Malaise.
Elevations: collected from 5 - 830 meters, 251 meters average