The usefulness of the ultrastructural characters of spermiogenesis and of the spermatozoon in the interpretation of relationships in the Platyhelminthes has been widely demonstrated. The present paper provides a review and an update on the ultrastructural knowledge on spermiogenesis and on the spermatozoon in cyclophyllidean cestodes. For each family of cyclophyllideans the pattern of spermiogenesis and the type of sperm cell is provided. Moreover, the most interesting characteristics of both spermiogenesis and the spermatozoon are compiled and illustrated for each family. Finally, new spermatological data on some species of the Anoplocephalidae and the Taeniidae are provided.

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