Key to Rotastruma species

The following key will allow identification of the known Rotastruma species (based on workers).

This key is based on Bolton (1991) as modified and updated by Hosoishi et al. (2021).

1

 * With head in full-face view the posterior margin conspicuously concave and lateral margin convex Rotastruma recava
 * With head in full-face view the posterior margin more or less flat and lateral margin straight to slightly convex

2

 * Propodeal spines directed upwards in profile view, curved at mid-length in dorsal view. Petiole with a distinct anterior peduncle; peduncle longer than high  Rotastruma epispina
 * Propodeal spines directed backwards in profile view, straight in dorsal view. Petiole nodiform, with a short anterior peduncle; peduncle shorter than high  Rotastruma stenoceps