Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
Minor worker: head length 0.49mm, head width 0.44mm, scape length 0.44mm, Webers length 0.61mm (n=1). Head flattened, subcordate behind; promesonotum evenly arched, mesonotal suture absent; propodeal spines nearly absent, reduced to tiny tubercles; face, mesosoma, and gaster smooth and shining; dorsal pilosity abundant, of moderate length, flexuous, some setae on mesosomal dorsum branched near apex, branches minute; color orange brown.
Major worker: head length 1.21mm, head width 0.96mm, scape length 0.52mm (n=1). Face shiny, diverging longitudinal rugae between frontal carinae, extending posteriorly about one third of face length, reticulate rugae between eyes and antennal insertions, rest of face smooth; hypostomal margin with pair of teeth, located about one third distance from midline to recessed teeth flanking mandibles (Figure); dorsal pilosity abundant; head with abundant short setae projecting from sides of head in face view.
Similar species: hasticeps, synarmata.
Mainland Neotropics from Mexico to Argentina, and many Caribbean islands. Costa Rica: Atlantic slope to 800m, possibly elsewhere (see Comments).
Occurs in a wide range of habitats, including seasonally dry areas, wet habitats, mature forest, open pasture areas, city parks, beach edge; nests in soil, forming clusters of small crater-form tumuli; generalist foragers that quickly recruit to baits.
Longino has confused subarmata and hasticeps in earlier identifications. See discussion under hasticeps.
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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