Key to Afrotropical Polyrhachis species-groups

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This worker key is based on: Rigato, F. 2016. The ant genus Polyrhachis F. Smith in sub-Saharan Africa, with descriptions of ten new species. (Hymenoptera: Formicidae). Zootaxa. 4088:1–50.

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1

  • Metanotal suture distinctly impressed, as a V- or U-shaped groove in profile . . . . . . 2
  • Metanotal suture not impressed, often faint . . . . . 3

2

  • At least pro- and mesonotum strongly laterally marginate . . . . . militaris-group
  • Mesosoma immarginate . . . . . monista-group

3

  • Mesosoma distinctly laterally marginate. Pilosity strongly reduced . . . . . viscosa-group
  • Mesosoma at least partially immarginate and/or at most with lateral margination very weak in part. Pilosity often abundant . . . . . 4

4

  • Mesosoma short, in profile appearing distinctly high, short and posteriorly humped, with a long and very steep propodeal declivity; propodeal dorsum unarmed at its posterior corners. Anterior clypeal margin always bearing a median shallow rectangular lobe . . . . . alexisi-group
  • Mesosoma more elongate, in profile not appearing distinctly high, short and posteriorly humped; propodeal declivity not particularly long and/or steep and propodeal dorsum usually toothed or ridged at its posterior corners. Anterior clypeal margin often without a median rectangular lobe . . . . . 5

5

  • Mesosoma often fully immarginate; mesonotal and propodeal margination, if present, at most weak. In dorsal view mesoscutellum not visible . . . . . revoili-group
  • Pro- and mesonotum immarginate, propodeum marginate. In dorsal view mesoscutellum distinct . . . . . gamaii-group