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Ein Morphologisch-Histologischer Beitrag Zur Häutung Von Porcellio Scaber Latr. Und Oniscus Asellus L. (Isopoda Terrestria) 1)

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The author describes the morphological alterations in Porcellio scaber Latr. and Oniscus asellus L. before and during the molting. The alterations are most marked in the first four thoracic segments and in the cuticle. Histological examinations showed that the new epicuticula is formed over the whole body during the preparation for the molting (proecdysis stages D0-D1). The exocuticula, on the other hand, is formed in the corresponding half of the body some time before the respective molting phase (proecdysis D2-D4 and stage E, or stages D2'-D4' and stage E', respectively). The author tries to explain the complicated redistribution of calcium during the molting by the application of histological methods. Gland cells of a new kind, called "double cells", are described and their secretory cycle is correlated with the stages in the intermoult cycle.

Affiliations: 1: Zoologisches Institut und Museum, Greifswald, Deutschland

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