Gnamptogenys acuminata

Found in humid forests, nesting in rotten wood.

Identification
A member of the sulcata complex (in the sulcata subgroup of the sulcata species group). The acute posterior tooth on the petiolar node, combined with longitudinal costulae on the declivitous propodeal face, seem to provide the most reliable distinction from Gnamptogenys tortuolosa. Color in G. acuminata is not so variable but light-pigmented forms can occasionally be found. The mesometepisternal suture is usually absent.

Distribution based on Regional Taxon Lists
Neotropical Region: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela.

Nomenclature

 *  acuminata. Ectatomma (Gnamptogenys) acuminatum Emery, 1896g: 50 (w.q.) BRAZIL. Combination in Gnamptogenys: Brown, 1958g: 227.

Description
Mandibles subtriangular; longitudinal costulae on mesosoma and declivitous propodeal face; transverse sutures weak, visible only with certain angles of light; body dark brown to black; coxae and basal two-thirds of femora testaceous to brown-testaceous; tibiae, apex of femora, antenna and mandibles brown.