Ultrastructural dynamics of the corpus allatum of Choleva angustata Fab. (Coleoptera, Catopidae).

The ultrastructure of the corpora allata (CA) during postembryonic stages of Choleva angustata Fab. shows cyclic changes, in particular regarding the endoplasmic reticulum and the mitochondria. During the last larval instar, at the short transitory period which follows the cessation of alimentation, we observed a highly unusual appearance of the CA, characterized by intensive vacuolization.

[Ultrastructural changes in the corpora allata of the last larval instar of Choleva angustata Fab. (Catopidae). The effect of fasting, with or without ecdysterone].

Fasting experiments show striking changes at the ultrastructural level in the corpora allata of the last larval instar of Choleva angustata Fab: increase of the glandular volume and development of the smooth reticulum. These findings suggest that fasting leads to a continuous activity of the corpora allata.