The spines on the convex and concave wing nervures in Anisozygoplera and Anisoptera differ morphologically and, according to their location, also in distribution and size. The latter is correlated to the surface and wing chords. The relative numbers of spines on the fore and hind wings and on both surfaces of the same wing are constant in the two suborders. Comparing these results with those on Zygoptera (M. D’ANDREA & S. CARFl, 1988, Odonatologica 17; 313-335) reveals a substantial uniformity of this trait in the entire order of Odonata.