Key to Nesomyrmex brevicornis group species

This worker key is based on: [[Media:Csosz, S., Fisher, B.L. 2016. Taxonomy of Malagasy Nesomyrmex brevicornis species-group.pdf|Csősz, S. & Fisher, B.L. 2016. Taxonomy of Malagasy Nesomyrmex brevicornis species-group using conventional morphology-based approach. ZooKeys. 616:125–159. (doi:10.3897/zookeys.616.9532).]]

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 * Nesomyrmex
 * Nesomyrmex brevicornis species-group

1

 * Head and mesosoma dark brown to black . . . . . 2 (Nesomyrmex brevicornis, Nesomyrmex brunneus, Nesomyrmex edentatus, Nesomyrmex flavigaster)


 * Head and mesosoma yellow . . . . . 5 (Nesomyrmex cingulatus, Nesomyrmex longiceps, Nesomyrmex minutus, Nesomyrmex punctaticeps, Nesomyrmex sellaris)

2
return to couplet #1
 * Gaster pale yellow, the rest of the body dark brown to black . . . . . Nesomyrmex flavigaster


 * Body—including gaster—concolorous, dark brown to black . . . . . 3 (Nesomyrmex brevicornis, Nesomyrmex brunneus, Nesomyrmex edentatus)

3
return to couplet #2
 * Large species, cephalic size (CS) > 620 μm [620, 808] . . . . . Nesomyrmex brunneus


 * Smaller species, cephalic size (CS) < 560 μm [472, 560] . . . . . 4 (Nesomyrmex brevicornis, Nesomyrmex edentatus'')

4
return to couplet #3
 * Head feebly imbricate, appears shiny. Scape longer (SL/CS) > 0.65 [0.65, 0.67] . . . . . Nesomyrmex edentatus


 * Head coarsely imbricate, appears dull. Scape shorter (SL/CS) < 0.55 [0.53, 0.55] . . . . . Nesomyrmex brevicornis

5
return to couplet #1
 * First gaster tergite brown, conspicuously darker than the rest of the body . . . . . 6 (Nesomyrmex cingulatus, Nesomyrmex minutus)


 * Body concolorous, gaster light yellow . . . . . 7 (Nesomyrmex longiceps, Nesomyrmex punctaticeps, Nesomyrmex sellaris)

6
return to couplet #5
 * On the median area of frons foveae around setal pits larger, the largest diameter of pits 15–20 μm. Frontal carina distance (FRS/CS): 0.31 [0.30, 0.33], scape length (SL/CS): 0.63 [0.60, 0.65] . . . . . Nesomyrmex cingulatus


 * On the median area of frons foveae around setal pits inconspicuous, the largest diameter of pits ≤ 10 μm. Frontal carina distance (FRS/CS): 0.36 [0.33, 0.39], scape length (SL/CS): 0.57 [0.53, 0.61] . . . . . Nesomyrmex minutus

7
return to couplet #5
 * Head longer (CL/CWb) >1.40 [1.42, 1.46], postocular area relatively shorter (PoOC/CL) < 0.45 [0.42, 0.45] . . . . . Nesomyrmex longiceps


 * Head shorter (CL/CWb) < 0.30 [1.14, 1.26], postocular area relatively longer (PoOC/CL) > 0.47 [0.47, 0.53] . . . . . 8 (Nesomyrmex punctaticeps, Nesomyrmex sellaris)

8
return to couplet #7
 * Frontal carina distance larger (FRS/CS) > 0.33 [0.32, 0.35]. On the median area of frons foveae around setal pits larger, the largest diameter of pits 10–15 μm . . . . . Nesomyrmex punctaticeps


 * Frontal carina distance smaller (FRS/CS) < 0.29 [0.27, 0.30]. On the median area of frons setal pits are not embedded by foveae . . . . . Nesomyrmex sellaris