Abstract
The neurosecretory elements of the brain-corpora cardiaca complex were examined in early- (ED) and late-diapausing (LD) pupae of Tyria jacobaeae (Lepidoptera), an insect with obligatory diapause. Neurosecretory granules were present in pars intercerebralis (PI) and lateral (LA) cells of the brain, as well as in the axon component of corpora cardiaca (cc). Variations were observed in the shape, density and distribution of the granules. Differences exist between ED and LD brain cells. Axonal pathways linking PI-LA cells and cc were devoid of granules, but exhibited changes at the microtubular level. This is the first time such observations have been made in an obligatory diapause pupa.
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