Key to Amoimyrmex workers

This worker key is based on Cristiano, M.P., Cardoso, D.C., Sandoval‐Gómez, V.E., Simões‐Gomes, F.C. 2020. Amoimyrmex Cristiano, Cardoso, Sandoval, gen. nov. (Hymenoptera: Formicidae): a new genus of leaf‐cutting ants revealed by multilocus molecular phylogenetic and morphological analyses. Austral Entomology. 59:643–676. doi:10.1111/aen.12493

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• Pronotum with a pair of small median pronotal spines, best seen in frontal view (Figure 9g); Argentina and Bolivia . . . . . Amoimyrmex bruchi

• Pronotum without a pair of small median pronotal spines (Figure 9i); projections as tubercles may be present, but never forming a spine, best seen in frontal view (Figure 9h). . . . . 2

Figure 9g-i. Amoimyrmex, full‐face view. (g) Amoimyrmex bruchi, showing median pronotal spines. (h) Amoimyrmex striatus, showing median pronotal tubercles, rough irregular striae and acute posterior cephalic corners (dotted line). (i) Amoimyrmex silvestrii, showing unarmed anterior pronotum, parallel irregular striae and rounded posterior cephalic corners (dotted line). MPS, median pronotal spine; MPT, median pronotal tubercles; Pes, parallel irregular striae; Res, rough irregular striae. Cristiano, Cardoso and Sandoval 2020.

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• Posterior cephalic corner acute to angular (Figure 9h, dotted lines); in full‐face view, integument covered by parallel irregular striae (Figure 9h); Brazil and Uruguay . . . . . Amoimyrmex striatus

• Posterior cephalic corner rounded (Figure 9i, dotted lines); in full-face view, integument covered by rough irregular striae (Figure 9i); Argentina and Paraguay . . . . . Amoimyrmex silvestrii