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Costa Rica (type locality), Colombia. Costa Rica: wet forest lowlands throughout the country (Hitoy Cerere Biological Reserve, La Selva Biological Station, Rio Penas Blancas Valley at 800m, Carara Biological Reserve, Osa Peninsula, San Vito).
This species inhabits the forest floor leaf litter in mature wet forest habitats. I know it from 9 Winkler samples of sifted leaf litter, and a collection from a very rotten but still vertical treetrunk. Dana Meyer, a student working at Sirena in Corcovado National Park, collected a live colony from under a rotten log and observed it for a period of time. His notes indicated that the colony (1) took small isopods but not small flies; (2) was possibly polygynous; and (3) had lighter-colored ergatoid queens.
Emery, C. 1890. Studii sulle formiche della fauna neotropica. Bull. Soc. Entomol. Ital. 22:38-80.
Found most commonly in these habitats: 42 times found in mature wet forest, 8 times found in montane wet forest, 1 times found in Sendero Jaguar, 1 times found in SS0, 1 times found in SSA, 1 times found in isolated clearing in mature wet forest area, open lawn area at edge of building., 2 times found in tropical rainforest, 2 times found in tropical rainforest, with big trees, probably primary, 2 times found in moist forest, 3 times found in rainforest, ...
Found most commonly in these microhabitats: 54 times ex sifted leaf litter, 13 times Hojarasca, 3 times Wet forest. Ex sifted leaf litter., 1 times colony in soil, 1 times Del cruce de Cascante hacia el Ceibo, 1 times Trampa de caida, 1 times sifted leaf litter, 1 times nocturnal foragers on rotten trunk, 1 times ex sifted leaf litter and rotten wood.
Collected most commonly using these methods: 48 times miniWinkler, 17 times Winkler, 7 times Mini Winkler, 3 times search, 1 times maxiWinkler, 1 times Berlese.
Elevations: collected from 10 - 1310 meters, 285 meters average
Type specimens: Lectotype of Leptogenys pusilla: casent0903965