Key to Polyrhachis Cyrtomyrma of Borneo

This worker key is based on Kohout 2006, 2007.

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 * Polyrhachis
 * Cyrtomyrma
 * Ants of Borneo

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


 * 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

4
return to couplet #2
 * Propodeum armed with pair of short spines; petiole with pair of elongated lateral spines, dorsal pair lacking . . . . . Polyrhachis bruehli


 * Propodeal dorsum unarmed; petiole with pair of dorsal blunt teeth and pair of distinctly longer lateral spines . . . . . 5

5
return to couplet #4
 * Anterior clypeal margin with central, blunt, projecting tooth . . . . . Polyrhachis achterbergi


 * Anterior clypeal margin deeply emarginate medially . . . . . Polyrhachis widodoi

6

 * Larger species (HL > 1. 65); petiole with sides more-or-less parallel, spines reduced to minute denticles . . . . . Polyrhachis danum


 * 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


 * 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


 * Propodeal declivity oblique; petiolar spines subequal or lateral pair shorter than dorsal pair; legs mostly orange or light reddish-brown . . . . . Polyrhachis rastellata