Polyrhachis thrinax species-group

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 * Polyrhachis

This species in this group are members of the subgenus Myrmothrinax.

Species

 * Polyrhachis cincta
 * Polyrhachis unicuspis

The subgenus Myrmothrinax is divided into two species-groups, based on the most characteristic feature in the workers - the relative lengths of the petiolar spines. The aequalis-group includes species with the petiolar spines more-or-less subequal or with the middle spine shorter than the lateral pair. The thrinax-group includes those species with a distinctly elongated middle spine.