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    Ultrastructure of sperm and spermiogenesis ofPterastericola astropectinis (Platyhelminthes, Rhabdocoela, Pterastericolidae)

    During development of the spermatid, two free flagella are transported distally from the main spermatid mass by elongation of the shaft. They rotate back towards the shaft and lie parallel with it prior to fus...

    N. A. Watson, K. Rohde, U. Jondelius in Parasitology Research (1993)