Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
Minor worker: head length 0.72mm, head width 0.64mm, scape length 0.77mm, Webers length 0.92mm (n=1). Head rounded behind, vertex collar very narrow; promesonotal and metanotal grooves well impressed; propodeal spines short; face smooth and shiny; pronotum and mesonotal dorsum smooth and shiny; rest of mesosoma uniformly foveolate; gaster smooth and shiny; scapes with abundant erect setae; face and mesosoma with abundant, long, flexuous setae; gaster with abundant suberect setae; color red brown.
Major worker: head length 1.24mm, head width 1.09mm, scape length 0.71mm (n=1). Face shiny throughout; mostly smooth, with widely-spaced striae in area between eye, frontal carina, and mandibular insertion; hypostomal margin with pair of widely-spaced, spiniform teeth, located near small recessed teeth flanking mandibles; setae projecting from face and vertex margin, but setae on sides of head decumbent, not projecting; mesosoma and gaster with abundant dorsal setae.
Costa Rica: mid-elevation Atlantic slope and Cordillera de Tilaran.
This species inhabits montane moist to wet forest. Project ALAS collected it at the 1070m site on the Barva Transect in Braulio Carrillo National Park. It was collected in Malaise traps, flight intercept traps, Winkler samples of forest floor leaf litter, and as foragers hand collected in the refuge clearing. One collection is also known from Monteverde. Longino collected it in the lower Bajo del Tigre forest, a moist forest area just below the continental divide on the upper Pacific slope. A nest was found beneath a stone.
The elongate head of the major is a very distinctive feature of this species, relative to variegata and other similar species. It keys to aciculata in Wilson (2003) but the scapes are shorter and it is generally smaller.
John T. Longino, The Evergreen State College, Olympia WA 98505 USA. firstname.lastname@example.org
Stefan Cover, Museum of Comparative Zoology, Harvard University, Cambridge MA 02138 USA. email@example.com
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