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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 wet forest, 1 times found in CCL 550, 1 times found in mature and second growth wet forest, 1 times found in tropical moist forest, 1 times found in tropical rainforest, with some big trees, probably a mix of primary and secondary forest.
Found most commonly in these microhabitats: 20 times ex sifted leaf litter, 2 times at bait, 2 times Leaf litter, 1 times ground forager(s), 1 times Primary forest, 1 times nocturnal strays, 1 times nest between leaves in leaflitter.
Collected most commonly using these methods: 17 times MiniWinkler, 2 times baiting, 2 times MaxiWinkler, 2 times Mini Winkler, 2 times Search, 1 times Winkler, 1 times Lure/Bait, 1 times Pitfall72h, 1 times Winkler48h.
Elevations: collected from 30 - 445 meters, 109 meters average
Type specimens: syntype of Apterostigma immobile: casent0905912