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Mexico to Ecuador. Costa Rica: occurs throughout lowland wet forest to approx. 800m.
minor appears to be a ubiquitous inhabitant of lowland wet forest throughout Costa Rica. The species is not restricted to wet forest, because I once observed foragers to be abundant in a small pasture with scattered guava trees. The pasture was adjacent to a forest patch, so I do not know if the species requires forest as a source area. Almost the only way I ever see this species is as workers and queens scattered sparsely on low vegetation at night. At La Selva, they have been collected in dawn canopy fogging events and in Malaise traps. From these observations I conclude: (1) both workers and queens forage, (2) foraging is solitary, and (3) foraging is almost entirely nocturnal. Foragers are furtive when illuminated at night, and thus it is very difficult to follow foragers back to a nest. I observed one nest entrance at Corcovado: a small clay turret extending 1-2cm up the side of an erect plant stem.
Brown, W. L., Jr. 1958. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bull. Mus. Comp. Zool. 118:175-362.
Kempf, W. W., Brown, W. L., Jr. 1968. Report on some Neotropical ant studies. Papeis Avulsos Zool. 22:89-102.
Found most commonly in these habitats: 117 times found in montane wet forest, 16 times found in mature wet forest, 11 times found in lowland rainforest, 9 times found in Sura, 3 times found in CCL 400 m, 8 times found in wet forest, 7 times found in ridgetop cloud forest, isolated peak with oak trees, 6 times found in lowland wet forest, 6 times found in ridgetop cloud forest, 4 times found in CCL 840M, ...
Found most commonly in these microhabitats: 56 times Sobre Vegetacion, 28 times ex sifted leaf litter, 18 times beating vegetation, 10 times beating veg., 7 times Sura, 4 times bajo de M/20, 3 times bajo de M/17, 4 times nocturnal strays, 4 times bajo de M/16, 3 times Hojarasca, 3 times Copa de arbol, ...
Collected most commonly using these methods: 56 times Sweeping, 41 times Malaise, 36 times flight intercept trap, 27 times Fogging, 28 times Beating, 26 times MiniWinkler, 20 times search, 4 times Pitfall, 3 times Mini Winkler, 1 times blacklight, 2 times hand collecting, ...
Elevations: collected from 10 - 1350 meters, 477 meters average
Type specimens: Holotype of Acanthoponera crassa: castype06888