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Bolivia, Brazil, Ecuador, Guyana, Trinidad (type locality), Venezuela, Panama, Costa Rica. Costa Rica: Atlantic lowlands.
Apterostigma auriculatum is widespread in South America (Lattke 1997) and appears to reach its northern limit in Costa Rica. I know this species from two Costa Rican localities: La Selva Biological Station and Hitoy Cerere Biological Reserve. Both are lowland rainforest sites, about 100m elevation. At Hitoy Cerere, I found a dealate queen while collecting at night. At La Selva, Ted Schultz found a colony (#290692-01) between leaves in leaf litter on the forest floor. The fungus nest was a sponge cake-like disc between the leaves, with no envelope. In a baiting study at La Selva, Nichole Barger collected workers at a honey/crisco bait.
It is curious that this species has not been collected in Winkler samples of sifted leaf litter, in spite of intensive sampling effort at La Selva and elsewhere in Costa Rica.
I formerly called this morphospecies JTL-016.
Lattke, J. E. 1997. Revisi—n del gŽnero Apterostigma Mayr (Hymenoptera: Formicidae). Arq. Zool. (S‹o Paulo) 34:121-221.
Found most commonly in these habitats: 14 times found in mature wet forest, 4 times found in 2º lowland rainforest, 3 times found in lowland rainforest, 2 times found in tropical rainforest, 2 times found in Plateau, 1 times found in rainforest, 1 times found in wet forest, 1 times found in cloud forest, 1 times found in mature and second growth wet forest, 1 times found in tropical moist forest, ...
Found most commonly in these microhabitats: 20 times ex sifted leaf litter, 2 times at bait, 2 times LeafLitter, 1 times ex rotten log, 1 times sifted litter (leaf mold, rotten wood), 1 times Primary forest, 1 times nocturnal strays, 1 times nest between leaves in leaflitter, 1 times ground forager(s).
Collected most commonly using these methods: 17 times MiniWinkler, 2 times MaxiWinkler, 2 times baiting, 2 times Mini Winkler, 2 times Search, 1 times Winkler, 1 times Lure/Bait, 1 times Pitfall72h, 1 times Winkler48h, 1 times 6L sifted litter, extracted in Winkler sack over ~18 hours.
Elevations: collected from 30 - 795 meters, 158 meters average
Collect Date Range: collected between 1938-06-22 and 2015-06-10
Type specimens: syntype of Apterostigma immobile: casent0905912