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Les Organes Neurohemaux Et Les Glandes Endocrines De Pachygrapsus Marmora Tus (Fabricius) (Decapoda, Brachyura)

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image of Crustaceana

Two kinds of paired organs, the Y-organ and the mandibular organ, are described in the crab Pachygrapsus marmoratus. The former is located laterally in the cephalothorax while the latter is located near the median line of the body on both side of the ventral nerve cord. The Y-organ consists of one type of cells in which no structure characteristic of steroid secretion is visible. However, increased mitotic activity occurs in this gland during the premolt. The cells of the mandibular organ show a large nucleus, a Golgi apparatus, a copious, smooth endoplasmic reticulum and particularly numerous cup-shaped mitochondria. The ultrastrucure of the mandibular organ closely resembles that of cells known to synthesize steroids and also that of oenocytes and particularly the corpus allatum of insects.

Affiliations: 1: Laboratoire de Physiologie des Invertébrés, Université des Sciences et Techniques du Languedoc, Place E. Bataillon, 34060 Montpellier Cedex, France


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