Nesomyrmex brevicornis

This species is known to occur in the southwestern part of Madagascar from 30–770 m. Specimens have been collected from sifted litter (leaf mold, rotten wood) in tropical dry forest. (Csösz & Fisher 2016)

Identification
A member of the brevicornis species-group.

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 *  brevicornis. Nesomyrmex brevicornis Csösz & Fisher, 2016: 133, figs 10-13 (w.) MADAGASCAR.

Worker
Body color: dark brown; black. Body color pattern: concolorous. Absolute cephalic size: 506 [472, 536]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.33 [1.32, 1.35]. Postocular distance vs. cephalic length (PoOc/CL): 0.52 [0.51, 0.52]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture areolate. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging. Gena sculpture: ground sculpture areolate, main sculpture absent. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.25 [0.24, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.36 [0.34, 0.37]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/ CS): 0.54 [0.53, 0.55]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.23 [0.21, 0.25]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.31 [0.30, 0.33]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of first gastral tergite: continuously imbricate.

Type Material
Holotype: CASENT0027494, collection code: BLF07507, Parc National de Zombitse, 19.8 km 84° E Sakaraha, N -22.84333°, 44.71°, alt 770 m, Fisher, Griswold et al., 02.05.2003, (1w,, CASENT0027494); Paratypes: CASENT0195104, collection code: DMO-CS7, 48 km ENE Morondava, Kirindy, -20.06667°, 44.65°, alt 30 m, D.M.Olson, 01.05.1991, (1w, ); CASENT0482280, collection code: BLF04508, Forêt de Tsimembo, 11.0 km 346° NNW Soatana, N -18.99528°, 44.4435°, alt 50 m, Fisher-Griswold Arthropod Team, 11.21.2001, (1w, CASC).

Etymology
The name (brevicornis) refers to the short antennal scape that distinguishes this species from other taxa treated in this revisionary work.