"The galls were described and illustrated by Kieffer & Joergensen (1910) and later by Houard (1933) and Díaz
(1980). Galls develop inside twigs, consisting of small (approximately 1.5 mm diameter) ovoid or hemispheric
cells, up to 300–600, clustering closely, resulting in a compressed or fused enlarged mass gall measuring up to 12 cm long, breaking the bark of the twig (Figs 9E, 9F). The numerous small, circular, adult emergence holes are quite visible on the apical surface of the old galls (Fig. 9E)."" (Nieves-Aldrey & Blas, 2015.)"