Key to Nesomyrmex species groups of the Malagasy region

This worker key is based on: [[Media:Csosz & Fisher, 2015.pdf |Csösz, S. and Fisher, B.L. 2015. Diagnostic survey of Malagasy Nesomyrmex species-groups and revision of hafahafa group species via morphology based cluster delimitation protocol. ZooKeys. 526:19-59. PDF]]

This key was constructed as part of a study of Malagasy Nesomyrmex species. It should work well with species from this region but not for determinations of specimens from other regions.

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Nesomyrmex

1

 * Anterodorsal spines on petiolar node present (Fig. 7) . . . . . hafahafa group


 * Anterodorsal spines on petiolar node absent (Figs 8–11) . . . . . 2

2
return to couplet #1
 * Petiolar node globular in dorsal view (Fig. 8), postocular distance vs. petiole width (PoOc/PEW): 0.887 [0.723, 1.167] . . . . . angulatus group


 * Petiolar node long and narrow in dorsal view, sides are nearly parallel (Fig. 9). Postocular distance vs. petiole width (PoOc/PEW): (sikorai-group) 1.415 [1.198, 1.676], (madecassus-group) 1.610 [1.210, 2.090] . . . . . 3

3
return to couplet #2
 * Petiolar node in lateral view lower, (MPST/NOH): 3.541 [2.714, 5.625], propodeal spines very short to absent, mesopropodeal depression absent to shallow (Fig. 10) . . . . . madecassus group
 * Petiolar node in lateral view higher, (MPST/NOH): 2.409 [1.885, 2.869], propodeal spines moderately long, always present, mesopropodeal depression conspicuous, deep (Fig. 11) . . . . . sikorai group