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Brazil (Amazonas, Rondonia, Par‡, Tocantins), Guyana, Colombia, Costa Rica (Brand‹o 1990, 2003). Costa Rica: Atlantic and southern Pacific lowlands.
This species occurs in mature wet forest. It nests in small cavities in the low arboreal zone, and recruits to baits on the forest floor.
Brand‹o (2003) identified Costa Rican material as wallacei. He notes that the species exhibits considerable morphological variation. Costa Rican specimens will not key to wallacei in Brand‹o's 1990 revision because the mandibles are smooth with large piligerous punctures rather than striate. Also Brand‹o's figure of wallacei (1990:456, fig. 7) shows a subquadrate propodeal profile with little impression of the metanotal groove, in striking contrast to the Costa Rican material.
Brand‹o, C. R. F. 1990. Systematic revision of the neotropical ant genus Megalomyrmex Forel (Hymenoptera: Formicidae: Myrmicinae), with the description of thirteen new species. Arquivos de Zoologia, S‹o Paulo 31:411-481.
Brand‹o, C. R. F. 2003. Further revisionary studies on the ant genus Megalomyrmex Forel (Hymenoptera: Formicidae: Myrmicinae: Solenopsidini. PapŽis Avulsos de Zoologia 43:145-159.
Found most commonly in these habitats: 1 times found in CC 1400, 1 times found in SOR trail, 4 times found in montane wet forest, along ridge leading to stream, oak trees present, probably mature or old 2nd growth with relict trees, near pasture, 1 times found in montane wet forest, along ridge descending to major river, a mix of old 2ndary forest on one slope and more mature forest on the other, 1 times found in montane wet forest, along ridge leading to stream, oak trees, near pasture, 1 times found in SSE at GIS 1200..
Found most commonly in these microhabitats: 1 times Primary, 5 times ex sifted leaf litter, 1 times at bait.
Collected most commonly using these methods: 1 times Lure/Bait, 2 times Search, 5 times miniWinkler, 2 times Malaise, 1 times baiting.
Elevations: collected from 50 - 740 meters, 173 meters average