Volume 50/Number 3/Abstract 4
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Acta Parasitologica, Vol. 50, No. 3, 2005, 208-214
Cheikh T. Ba(1)*, Aissatou Ba(1) and Bernard Marchand(2) - Ultrastructure of the spermatozoon of Paroniella reynoldsae (Cyclophyllidea, Davaineidae) an intestinal parasite of Corvus albus (Aves, Corvidae)

(1)Laboratory of Parasitology-Helminthology, Department of Animal Biology, Faculty of Sciences and Techniques, Ch. A. Diop University of Dakar, Dakar, Senegal; (2)Laboratory "Parasites and Mediterranean Ecosystems", Faculty of Sciences and Techniques, University of Corsica Pascal Paoli, B.P. 52, F 20250 Corte, France
*Corresponding author: cheikhtidianeba1@yahoo.fr
ABSTRACT
The mature Paroniella reynoldsae spermatozoon exhibits an apical cone of electron-dense material about 2.2 um long and 0.65 um wide at its base and two helicoidal crest-like bodies roughly 100 to 150 nm thick. The latter are of different lengths, spiralled and make an angle of about 45 with the spermatozoon axis. The axoneme is of the 9 + '1' trepaxonematan pattern and does not reach the posterior extremity of the gamete. The nucleus is an electron-dense cord 0.25 um thick coiled in a spiral around the axoneme. The cytoplasm exhibits a posterior densification and contains few small electron-dense granules in regions I, II and V of the spermatozoon. In regions III and IV, it is divided into irregular compartments by walls of electrondense material. The cortical microtubules are spiralled at an angle of about 45. The presence of an electron-lucent apical cone containing numerous small granules of electron-dense material has never, to our knowledge, been reported in a cestode. Likewise, a crest-like body forming a terminal spot of electron-dense material located in the prolongation of the apical cone has never been described before in a cestode. Moreover, in this study, we try to show the existence of tight reciprocal phylogenetic relationships between genera within the Davaineidae and the Anoplocephalidae.
KEY WORDS: Ultrastructure, spermatozoon, Paroniella, Cestoda, Cyclophyllidea, Corvus albus, Aves

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