This paper provides the first ultrastructural data on the spermatozoon of a pseudophyllidean cestode belonging to the family Echinophallidae, Paraechinophallus japonicus, parasitizing deep-sea fish Psenopsis anomala from Japan. The mature spermatozoon contains two axonemes of the 9+"1" trepaxonematan pattern, nucleus, cortical microtubules, and electron-dense granules. Its anterior extremity exhibits a single electron-dense crested body. One of the most interesting features of the mature spermatozoon is the presence of a ring of tubular structures encircling the axoneme. This character, previously reported in species of the families Bothriocephalidae and Triaenophoridae, may be unique to pseudophyllideans of the group "Bothriocephalidea", thus supporting the assumption that the order Pseudophyllidea is formed in fact by two unrelated clades; "Bothriocephalidea" and "Diphyllobothriidea". The posterior extremity contains the posterior part of the nucleus and the disorganized axoneme--a character previously not described in the Eucestoda.

Biology Centre Institute of Parasitology Academy of Sciences of the Czech Republic Branisovská 31 Ceské Budĕjovice 370 05 Czech Republic

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