Gnamptogenys volcano

Identification
Gnamptogenys volcano is close to Gnamptogenys sulcata but the latter can be recognized by the longitudinal costulae on the propodeal declivity, broader head, rounded mandibular basal angle with no tooth and the straight clypeal lamella with acutely angulate sides. The structure of the clypeal lamella, mesepisternum, and mandible make this a striking species within the sulcata group. (Lattke 1995)

Distribution based on Regional Taxon Lists
Neotropical Region: Costa Rica.

Nomenclature

 *  volcano. Gnamptogenys volcano Lattke, 1995: 191, figs. 64, 65 (w.) COSTA RICA.

Worker
Holotype measurements: HL 1.38; ML 0.55; HW 1.18; ED 0.25; SL 1.18; WL 1.93 mm; CI 0.86; SI 1.00; OI 0.21.

Head in frontal view elongate, vertexal margin concave; eyes prominent and situated at mid-length; clypeal lamella relatively long, laterally rounded and medianly concave; mandibles smooth and shining, with prominent piligerous fossae; subtriangular basal angle preceded by a tooth and concavity (or notch); scape when laid back barely surpasses vertexal margin; mesosomal dorsum with longitudinal costulae and propodeal declivity with transverse costulae, in dorsal view the costulae arch posterad and become longitudinal; gaster with longitudinal costulae, including postpetiolar sternum, weakly effaced anteromedianly; metacoxae with dorsobasal tooth, dorsally with transverse costulae and laterally mostly smooth and shining; subpetiolar process with no posterior heel; tibiae and femora smooth and shining. Body with numerous standing golden hairs; body brown, legs and antennae reddish brown.

Type Material
Holotype worker. Costa Rica, Heredia: 18 km Volcan Barba, 10°17'N 84°05'W, 800m, 4/14-VII-1986, J. Longino no. 1383-5. Wet forest litter sample. Deposited in. One antenna lacking.

Etymology
The name of the species comes from the latin word for volcano, as the type locality is near the Barbas volcano.