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Ultrastructural details of the spermatozoa of some polyopisthocotylean monogenea


Annales des Sciences Naturelles Zoologie et Biologie Animale 7(3): 143-152
Ultrastructural details of the spermatozoa of some polyopisthocotylean monogenea
The ultrastructure of the spermatozoon has been studied in five species of Polyopisthocotylean Monogenea: Axine sp. (Axinidae), Kuhnia sp. (Mazocraeidae), Microcotyle sp. (Microcotylidae), Pseudomazocraes cf. monsivaisae (Chauhaneidae) and Pyragraphorus pyragraphorus (Pyragraphoridae). The spermatozoa of all these species display two axonemes and cortical longitudinal microtubules, as do all the other Polyopisthocotylean Monogenea previously described. However, some peculiarities do exist. Microcotyle and Pseudomazocraes show external ornamentations on the membrane associated with the cortical microtubules, ornamentations which are probably located on the anterior part of the spermatozoon. Transverse sections of the spermatozoon of Kuhnia exhibit a varying number of cortical microtubules; furthermore, cytoplasmic microtubules, not linked to the membrane, are present. In Axine, cortical microtubules are very few in number. In Pseudomazocraes, the two axonemes are of unequal length and thus the posterior nuclear part of the spermatozoon contains a single axoneme. Despite these few peculiarities, spermatozoa of Polyopisthocotylean Monogenea show a remarkable homogeneity in the sixteen genera (belonging to thirteen families) which are presently known. Because of this homogeneity, comparative spermatology is of little use for the understanding of phyletic relationships within the Polyopisthocotylean Monogenea, in contrast to the Monopisthocotyleans in which a great variation is found.


Accession: 006857942



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