Abstract
The ultrastructural details of the corpora allata of Hypogastrura tullbergi (Collembola : Hypogastruridae) during its life cycle are described. For young ecomorphic individuals of the pre-reproductive stage, the corpus allatum is of a very reduced size. The cells composing this gland are small and do not present cytological features normally present in functional cells. They are not differentiated and seem inactive. Their differentiation is stopped at this stage during the whole ecomorphosis, and their development resumes at the end of ecomorphosis and is completed after ecomorphosis; major changes include gradual increase of size, formation of cellular organelles related to functional state and particularly development of the smooth reticulum. As for post-reproductive ecomorphic adults, the allatal cells lose their cytological features and demonstrate numerous disintegrating features, such as, lysosomal bodies. In both cases, during ecomorphosis, the corpus allatum shows all the signs related to inactive glands.
Published Version
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