Brachymyrmex obscurior Forel 1893

Formicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

worker face view

worker lateral view


Mexico to northern South America, many Caribbean islands. Costa Rica: 25km NW Cahuita, Sierpe.


Face smooth, with a few erect setae (usually a pair on vertex margin), abundant appressed pubescence; scapes surpass vertex margin by one-half length of first funicular segment; pronotum and mesonotum each with pair of dorsal setae; first gastral tergite with abundant appressed pubescence, many erect setae; metanotal groove weakly impressed; color dark brown.

Natural History

This is a widespread species, common in other parts of the world in synanthropic habitats. In Costa Rica it is less common than the related B. heeri, a similarly synanthropic species. I know B. obscurior from two collections in Costa Rica, both coastal. One collection is from a beach site 25km North of Cahuita on the Atlantic coast, the other is from the town square of Sierpe, a small port town in a mangrove estuary on the Pacific coast.

Page author:

John T. Longino, The Evergreen State College, Olympia WA 98505

Date of this version: 14 July 2004.
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