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PubMed1988

The ultrastructure of the spermatozoon in Pisione remota (Annelida: Polychaeta) and its transformation in the receptaculum seminis.

The spermatozoon of Pisione remota and its transformation after transmission into the female are unique within Polychaeta. Most prominent organelles of the rod-shaped aflagellate gamete in the male are an elongate nucleus formed like a canoe, a parallel arranged vacuole-like structure with a peripheral network of cisternae, and mitochondria and lamellar bodies on both ends of the cell. In the female the vacuole-like structure detaches from the nucleus and is obviously phagocytosed by a receptacle cell. The nucleus is largely expanded. The cytoplasmic sheath of the sperm differentiates to form a system of pseudopod-like projections that envelop the apical projections of the receptacle cells. The structures and their transformations are considered to be related to a long-term storage of the sperm in the female.

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