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Les Glandes Cephaliques De Paragnathia Formica (Hesse, 1864) (Isopoda, Gnathiidae): Localisation Et Ultrastructure

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Two pairs of cephalic endocrine glands are observed in larvae of Paragreathia formica. The antennary glands, near the base of the antennae, are connected by a plexus with the antennary nerves, and by nerves with the infra-oesophageal ganglion. Their cells contain a large nucleus, and numerous mitochondria, Golgi apparatus, and free ribosomes. The antennary glands begin to degenerate before the end of the male metamorphosis: the possible meaning of this fact is discussed. The Y organs, located behind the base of the maxilla and the opening of the excretory organ, present afferent axons. Their cells contain a mean nucleus, numerous mitochondria, and sometimes groups of little vesicles. Some differences in the density of organelles are observed between neighbouring cells and these increase with the age of the larvae. The degeneration of Y organs does not start before the metamorphosis.

Affiliations: 1: Groupe d'Ecophysiologie, Centre de Physiologie des Invertébrés, Université des Sciences et Techniques du Languedoc, Place E. Bataillon, 34060 Montpellier Cedex, France


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