The head of the soldier is somewhat heart-shaped with the evenly rounded posterolateral lobes bulging laterally and the head attenuating anteriorly. Used in Antkey to separate majors of Pheidole megacephala from other majors of other Pheidole.
The head is subquadrate, weakly longer than wide, and with a more flat posterior margin. Used in Antkey to separate the minor worker of Pheidole teneriffana from that of Pheidole fervens and Pheidole obscurithorax.
The posterior margin of the head is strongly convex and arching strongly towards the eyes. Used in Antkey to separate the minor worker of Pheidole obscurithorax from Pheidole teneriffana (flat margin) and Pheidole fervens (weakly convex).