Key to Polyrhachis Cyrtomyrma of Borneo

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This worker key is based on Kohout 2006, 2007.

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1

  • Pronotal shoulders produced into distinct teeth . . . . . 2
  • Pronotal shoulders without distinct teeth, narrowly or broadly rounded or bluntly angular . . . . . 6

2

return to couplet #1

  • Head, mesosoma, petiole and gaster finely shagreened, jet-black . . . . . 3
  • Head, mesosoma and petiole distinctly reticulate-punctate, opaque, distinctly blue or with bluish sheen . . . . . 4

3

return to couplet #2

  • Mesosoma in profile strongly convex anteriorly; mesonotum, propodeum and declivity descending posteriorly in an almost straight line; petiolar spines reduced to obtuse teeth . . . . . Polyrhachis laevissima
MCZ-ENT001 Polyrhachis-laevissima hef.jpg
MCZ-ENT001 Polyrhachis-laevissima hal.jpg
  • Mesosoma in profile moderately convex; mesonotum and propodeum descending posteriorly in weakly convex line before abruptly sloping into steep declivity; petiole with elongate lateral spines . . . . . Polyrhachis sulang
Polyrhachis sulang casent0903392 h 1 high.jpg
Polyrhachis sulang casent0903392 p 1 high.jpg

4

return to couplet #2

  • Propodeum armed with pair of short spines; petiole with pair of elongated lateral spines, dorsal pair lacking . . . . . Polyrhachis bruehli
Polyrhachis bruehli 40 head AntWiki.jpg
Polyrhachis bruehli 32 side AntWiki.jpg
  • Propodeal dorsum unarmed; petiole with pair of dorsal blunt teeth and pair of distinctly longer lateral spines . . . . . 5

5

return to couplet #4

Polyrhachis achterbergi holotype head.jpg
Polyrhachis achterbergi holotype side.jpg

6

  • Larger species (HL > 1. 65); petiole with sides more-or-less parallel, spines reduced to minute denticles . . . . . Polyrhachis danum
Polyrhachis danum casent0217423 h 1 high.jpg
Polyrhachis danum casent0217423 p 1 high.jpg
  • Smaller species (11 L < 1. 65); petiole with sides diverging, spines acute . . . . . 7

7

return to couplet #6

  • Pronotal shoulders broadly rounded; lateral petiolar spines lip to four times as long as their basal width . . . . . Polyrhachis acuminata
Polyrhachis acuminata holotype head.jpg
Polyrhachis acuminata holotype side.jpg
  • Pronotal shoulders narrowly rounded or subangular; lateral petiolar spines at most twicc as long as their basal width . . . . . 8

8

return to couplet #7

  • Propodeal declivity very steep, virtually vertical; lateral petiolar spines distinctly longer than dorsal pair; legs dark reddish-brown . . . . . Polyrhachis lepida
Polyrhachis lepida casent0903391 h 1 high.jpg
Polyrhachis lepida casent0903391 p 1 high.jpg
  • Propodeal declivity oblique; petiolar spines subequal or lateral pair shorter than dorsal pair; legs mostly orange or light reddish-brown . . . . . Polyrhachis rastellata
Polyrhachis rastellata casent0903407 h 1 high.jpg
Polyrhachis rastellata casent0903407 p 1 high.jpg

References