Postembryonic development of the optic lobe in Lestes eurinus Say and Aeshna mixta Latreille: volumetric growth (Zygoptera: Lestidae; Anisoptera: Aeshnidae)

The postembryonic development of the optic lobe was studied from the early larval instars to the adult stage. The volumetric growth of the lobe and some of its structures were analyzed in relation to the growth of the brain and the compound eye. The evidence obtained indicates a continuous growth of the optic lobe throughout larval life, some structures developing at a faster pace than the others. Some differences have also been noted between Zygoptera and Anisoptera, particularly with reference to the lamina.