Abstract
In the shrimp (Crangon septemspinosa), spermatid production and storage occur within an extensive syncytium. Reduction of this syncytium results from the reorganization of syncytial materials into elaborate tubuloreticular and lamellar membrane profiles which enclose granular inclusions and mitochondria. In this study, these configurations are referred to as cytoplasmic reduction complexes (CRC) and are present throughout the region of the testes undergoing stage 4 of spermiogenesis. The vacuolated appearance of this segment of the testes is the result of CRC formation. Further reduction of the syncytium and syncytial complexes proceeds according to their relationship with nurse cells. The tubuloreticulum of complexes located near nurse cells is transformed into multilaminate membrane whorls which, subsequently, are phagocytosed by nurse cells. In contrast, the complexes and associated vacuoles not related spatially to nurse cells are further reduced to irregular membrane profiles and paracrystalline lattices. The possible functional significance of these membranous inclusions is discussed.
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