Key to Polyrhachis armata-group species

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This worker key is based on: Kohout, R.J. 2008a. A review of the Polyrhachis ants of Sulawesi with keys and descriptions of new species (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum. 52:255-317.

Polyrhachis peregrina is known only from the queen caste and is not included in the following key.

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1

  • Head, mesosoma and petiole deeply and coarsely foveolate-rugose . . . . . Polyrhachis armata
Polyrhachis-armata HUMCZ001H.jpg
Polyrhachis-armata-HUMCZ001L1.jpg
  • Head, mesosoma and petiole reticulate-punctate or weakly and shallowly rugose-punctate . . . . . 2

2

return to couplet #1

  • Dorsum of petiole medially with two short, acute, intercalary spines . . . . . 3
  • Dorsum of petiole medially with only vague rudimentary tuberculae . . . . . Polyrhachis nudata
Polyrhachis nudata casent0906776 h 1 high.jpg
Polyrhachis nudata casent0906776 p 1 high.jpg

3

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  • Propodeal spines virtually subparallel; whole body with distinct pile of pale-golden appressed pubescence . . . . . Polyrhachis aberrans
Polyrhachis aberrans casent0103181 head 1.jpg
Polyrhachis aberrans casent0103181 profile 1.jpg
  • Propodeal spines strongly diverging; whole body with rather diluted, silvery-white appressed pubescence . . . . . 4

4

return to couplet #3

Polyrhachis strictifrons casent0103192 head 1.jpg
Polyrhachis strictifrons casent0103192 profile 1.jpg
  • Smaller species (HL <1.65); pronotal spines horizontal, rather broad, but not massive . . . . . 5

5

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  • Eyes rather flat; pronotal spines short, hardly longer than width at base; pronotal dorsum between spines distinctly rugose-punctate . . . . . Polyrhachis diaphanta
Polyrhachis diaphanta casent0901866 h 1 high.jpg
Polyrhachis diaphanta casent0901866 p 1 high.jpg
  • Eyes convex; pronotal spines more slender, almost twice as long as width at base; pronotal dorsum uniformly and finely reticulate-punctate . . . . . Polyrhachis saevissima
Polyrhachis-saevissima-HUMCZ001H.jpg
Polyrhachis-saevissima-HUMCZ001L.jpg