Key to Solomon Island Polyrhachis Cyrtomyrma

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This worker key is based on: Kohout, R. J. 2006b. Review of Polyrhachis (Cyrtomyrma) Forel (Hymenoptera: Formicidae: Formicinae) of Australia, Borneo, New Guinea and the Solomon Islands with descriptions of new species. Memoirs of the Queensland Museum. 52:87-146.

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1

  • Dorsum of mesosoma more-or-less evenly convex in outline . . . . . 2
  • Dorsum of mesosoma distinctly higher anteriorly, descending posteriorly in uneven, undulating outline . . . . . 4

2

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  • Propodeal dorsum with pair of small teeth or tubercles; propodeal declivity very steep, virtually vertical, weakly concave at base . . . . . Polyrhachis johnsoni
Polyrhachis johnsoni casent0903408 h 1 high.jpg
Polyrhachis johnsoni casent0903408 p 1 high.jpg
  • Propodeal dorsum without teeth or tubercles; propodeal declivity oblique to main axis of body . . . . . 3

3

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  • Generally larger species (HL >1.68); petiole with well developed, acute, subequal spines . . . . . Polyrhachis fulakora
Polyrhachis fulakora casent0903414 h 1 high.jpg
Polyrhachis fulakora casent0903414 p 1 high.jpg
  • Generally smaller species (HL <1.53); petiole rather narrow, almost parallel-sided, with short, tooth-like spines . . . . . Polyrhachis ugiensis
Polyrhachis ugiensis casent0903415 h 1 high.jpg
Polyrhachis ugiensis casent0903415 p 1 high.jpg

4

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  • Pronotal humeri distinctly angular or subangular . . . . . 5

5

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  • Propodeum with pair of acute spines; mesosoma in profile with pronotal dorsum distinctly higher than summit of mesonotum . . . . . Polyrhachis pacifica
Polyrhachis pacifica casent0903399 h 1 high.jpg
Polyrhachis pacifica casent0903399 p 1 high.jpg
  • Propodeum without spines; mesosoma in profile with summit of mesonotum distinctly higher than pronotal dorsum . . . . . Polyrhachis undulata
Polyrhachis undulata casent0903401 h 1 high.jpg
Polyrhachis undulata casent0903401 p 1 high.jpg

6

return to couplet #4

  • Promesonotal suture situated at bottom of deep impression; propodeum with short, acute, upturned appressed hairs . . . . . Polyrhachis emeryana
Polyrhachis emeryana casent0906791 h 1 high.jpg
Polyrhachis emeryana casent0906791 p 1 high.jpg
  • Promesonotal suture not within impression; propodeum unarmed or, at most, with pair of very short spines or tuberculae; whole body covered with very abundant, short, erect, bristle-like hairs and rather short, decumbent hairs . . . . . Polyrhachis setosa
Polyrhachis setosa casent0903400 h 1 high.jpg
Polyrhachis setosa casent0903400 p 1 high.jpg