Nesomyrmex rugosus

This species is known to occur in rainforests between elevation of 200 m and 520 m (mean: 390 m) of the eastern and southern coasts of Madagascar.

Identification
A member of the sikorai species-group.

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 *  rugosus. Nesomyrmex rugosus Csösz & Fisher, 2016b: 22, figs. 3, 13A-C (w.q.m.) MADAGASCAR.

Worker
Body color: yellow to brown. Body color pattern: concolorous. Absolute cephalic size: 747 μm [650, 839]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.239 [1.189, 1.277]. Postocular distance vs. cephalic length (PoOc/CL): 0.467 [0.448, 0.493]. Postocular sides of cranium contour, anterior view orientation: converging posteriorly. Postocular sides of cranium contour, anterior view shape: convex. Vertex contour line in anterior view shape: straight or feebly convex. Vertex sculpture: main sculpture rugoso-reticulate, ground sculpture smooth. Gena contour line in anterior view shape: convex. Genae contour from anterior view orientation: strongly converging. Gena sculpture: rugoso-reticulate with feeble areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.226 [0.21, 0.235]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.292 [0.277, 0.312]. Longitudinal carinae on median region of frons: present. Smooth median region on frons: absent. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.816 [0.784, 0.856]. Median clypeal notch count: present. Median carina of clypeus: absent. Spine length vs. absolute cephalic size (SPST/CS): 0.288 [0.253, 0.352]. Minimum spine distance vs. absolute cephalic size (SPBA/CS): 0.221 [0.182, 0.256]. Apical spine distance vs. absolute cephalic size (SPTI/CS): 0.257 [0.191, 0.31]. Propodeal spine shape: straight. Apical distance of pronotal spines vs. absolute cephalic size (PSTI/CS): 0.635 [0.6, 0.692]. Metanotal depression: present. Dorsal region of mesosoma sculpture: rugose with smooth ground sculpture. Lateral region of pronotum sculpture: inconspicuously areolate ground sculpture, main sculpture rugoso-reticulate. Mesopleuron sculpture: smooth ground sculpture, superimposed by dispersed rugulae. Metapleuron sculpture: areolate ground sculpture, superimposed by dispersed rugae. Petiole width vs. absolute cephalic size (PEW/CS): 0.231 [0.2, 0.278]. Dorsal region of petiole sculpture: ground sculpture inconspicuously areolate, main sculpture rogoso-reticulate. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.345 [0.308, 0.376]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture dispersed rugose.

Type Material
Holotype worker: Madagascar: Prov. Antsisarana, Masoala National Park, 250 m, -15.33058 N, 50.30279 E, 13.iii.2014, collection code: BLF33157; CASENT0374465, Fisher et al. (, CASENT0374465);

Paratypes: 2 workers, a gyne and a male with the same label data with the holotype under CASENT codes: CASENT763560, BLF33157, (1q, CAS), CASENT0374466, BLF33157, (1w, 1m, CAS); CASENT0377059, BLF32874, (1w, CAS)

Etymology
The name refers to the coarse, rugose body sculpturing.