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image of Journal of Crustacean Biology

ABSTRACT The ultrastructure of the sperm of Pleuroncodes planipes indicates that the sperm is comprised of a nucleus, lamellar region, acrosome, and arms or spines typical of reptantian decapods. The acrosome is elongate and has several areas of differing electron density. A core of material continuous with the subacrosomal material extends into the acrosome. The lamellar region is posterior to the acrosome and consists of numerous membranes, mitochondria, and bands of microtubules. The arms or spines extend the length of the nucleus. Within the spermatophores, the arms reside in depressions or indentations of the composite plasma/nuclear membrane. The spines contain microtubules which extend from one spine to another by passing through the lamellar region in close association with the mitochondria. The sperm become surrounded with several layers of PAS positive material as they pass from the testis and posteriorly through the vas deferens. These secretions comprise the wall of the pedunculate sperm mass and surrounding layers of the spermatophore.


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