Ultrastructure of the spermatozoon of Paroniella reynoldsae [Cyclophyllidea, Davaineidae] an intestinal parasite of Corvus albus [Aves, Corvidae]

• Autorzy: Ba C T , Ba A. , Marchand B.
• Języki publikacji: EN

Abstrakty

EN

The mature Paroniella reynoldsae spermatozoon exhibits an apical cone of electron-dense material about 2.2 µm long and 0.65 µm wide at its base and two helicoidal crest-like bodies roughly 100 to 150 nra 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 µm 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 electron-dense 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.

Słowa kluczowe

EN

Corvidae; Cestoda; Corvus albus; Aves; Davaineidae; Paroniella reynoldsae; spermatozoon; intestinal parasite; ultrastructure; Cyclophyllidea

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2005
• Tom: 50
• Numer: 3
• Opis fizyczny: p.208-214,fig.,ref.

Twórcy

autor

Ba C T

• University of Dakar, Dakar, Senegal

autor

Ba A.

autor

Marchand B.

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