In this work the Author examines for the first time the ultrastructure of the spermatozoon in a Sipunculid worm, Golfingia gouldi. The observed characters indicate a very primitive pattern of marine sperm: non fibrous perforatorium, cup-like acrosome, vesicular mitochondria, «9 + 2» axoneme. The phylogenetical meaning of the observations is discussed.
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Con il contributo del Ministero per i Beni e le Attività Culturali