Gnamptogenys transversa

The types were collected from sifted premontane rainforest leaf-litter. Nothing else is known about the biology of .

Identification
A member of the hartmoni complex (in the regularis subgroup of the mordax species group). This species is very close to Gnamptogenys hartmani but hartmani has longitudinal costulae on the propodeal declivity; mostly smooth and shining mandibles; dorsum of petiole with mostly longitudinal striae; longitudinal striae on the postpetiolar sternum; eyes not as prominent, and scapes with more defined striae and rugulae. (Lattke 1995)

Distribution based on Regional Taxon Lists
Neotropical Region: Panama.

Castes
Only known from the worker caste.

Nomenclature

 * . Gnamptogenys transversa Lattke, 1995: 189, figs. 66, 67 (w.) PANAMA.
 * Type-material: holotype worker.
 * Type-locality: Panama: Bocas del Toro, Fortuna-Chirigui Grande road, 8°47’N, 82°12’W, 1050 m., 12-14.vii.1978, no. 523 (D.M. Olson).
 * Type-depository: MCZC.
 * Status as species: Lattke, et al. 2007: 262 (in key); Camacho, et al. 2020: 460 (in key).
 * Distribution: Panama.

Worker
Holotype measurements: HL 1.30; HW 1.10; ML 0.70; ED 0.28; SL 1.04; WL 1.92 mm; CI 1.18; SI 0.95; OI 0.25.

Head in frontal view with rectangular, elongate head: sides broadly convex, posterior margin slightly concave; clypeal lamella relatively long, medianly slightly concave and laterally rounded; eyes moderately prominent. Costulae on head principally longitudinal, slightly convergent anterad, costulae between eyes and frontal lobes curving into depression laterad of antennal sclerite. Mandibles triangular with blunt denticles and relatively long basal broader, rugulose with piligerous punctae. Scapes shining and slightly rugulose, barely passing posterior edge. Mesosoma dorsally with longitudinal costulae from pronotum to dorsum of propodeum, declivity with transverse costulae; promesonotal suture visible as a brief transverse depression. Laterally with longitudinal costulae throughout. Anepisternal flange well-developed along anterior third; katepisternum well-defined, anepisternum not as well-defined. Petiole laterally subcylindrical, costulae longitudinal/oblique, ventral process is an anteriorly projecting lobe. Petiole in dorsal view wider posteriorly than anteriorly, costulae form concentric arches: transverse in oblique-anterior view and longitudinal in posterior view. Gastric dorsum with longitudinal costulation, postpetiolar sternal disc smooth and shining. Transverse costulae on forecoxa, metacoxa with a parallel-sided denticle with a rounded apex.

Antennae, tibiae, femora with no pilosity, only decumbent to suberect hairs and sparse punctulae. Body brown, legs ferruginous brown.

Type Material
Holotype worker: Panama, Bocas del Toro, Fortuna-Chirigui Grande rd., 8°47'N 82°12'W, 12/14-VII-78, 1050m, D.M. Olson (523), leg. Premontane rainforest sifted leaflitter. Deposited in.

Etymology
The name alludes to the transverse costulae on the propodeal declivity.

References based on Global Ant Biodiversity Informatics

 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Lattke J. E. 1995. Revision of the ant genus Gnamptogenys in the New World (Hymenoptera: Formicidae). Journal of Hymenoptera Research 4: 137-193