Ultrastructure of the sinus gland in a terrestrial isopod,

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Abstract The sinus gland of the isopod, Armadillidium vulgare , is attached to the ventral surface of the optic lobe of the protocerebrum. Three types of neurosecretory granules can be distinguished in the sinus gland of this isopod. The number of granules changes in all three types during the molting cycle. The manner of release the granules is considered. In crustaceans the sinus gland is the major center for storage and release of neurosecretory hormones. It is composed of swollen axon terminals of neurosecretory cells whose somata are located in the central nervous system. The sinus gland is found in the eyestalks, on the dorsolateral surface of the optic ganglia in crabs and other higher crustaceans. But in isopods, which lack eyestalks, the sinus glands lie in the head attached to the protocerebrum. The ultrastructure of the sinus glands of decapod crustaceans has been studied intensely. But there have been few studies of the ultrastructure of isopod sinus glands Martin, 1972 Martin et al. , 1983 . In the present study the sinus gland in the isopod, Armadillidium vulgare was observed by electron microscopy.

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