Volume 50/Number 1/Abstract 7
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Acta Parasitologica, Vol.50, No. 1, 2005, 65-73
Jordi Miquel(1)*, Zdzislaw Swiderski(2,3) and Bernard Marchand(4) - Spermatological characters in the Dipylidiidae Stiles, 1896 (Cestoda, Cyclophyllidea)

(1)Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitaries, Facultat de Farmacia, Universitat de Barcelona, Av. Joan XXIII, s/n, 08028 Barcelona, Spain; (2)W. Stefanski Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warsaw, (3)Department of General Biology and Parasitology, Medical University of Warsaw, Poland; (4)Laboratoire Parasites et Écosystemes Méditerraneens, Faculte des Sciences et Techniques, Universite de Corse, 20250 Corte, France
*Corresponding author: jordimiquel@ub.edu

The present paper compares the ultrastructural data on spermatology of three dipylidiid species (Dipylidium caninum, Joyeuxiella echinorhynchoides and J. pasqualei) and establishes a general pattern of spermiogenesis and main ultrastructural characters of the mature spermatozoa for the Dipylidiidae. Spermiogenesis is characterized by an external growth of the flagellum followed by a proximodistal fusion of the latter with the cytoplasmic extension. The centrioles are associated with striated rootlets which are thin in D. caninum and well-developed in Joyeuxiella spp. The most characteristic features of the mature spermatozoa of the three species are the presence of a single crest-like body and a periaxonemal sheath. Nevertheless, the three compared species differ in the thickness of these structures. Differences are also observed in the length of the apical cone.

KEY WORDS: Dipylidium caninum, Joyeuxiella echinorhynchoides, J. pasqualei, Cestoda, Cyclophyllidea, Dipylidiidae, spermiogenesis, spermatozoon, ultrastructure

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